<?xml version="1.0" encoding="gb2312"?><?xml-stylesheet type="text/xsl" title="XSL Formatting" href="http://blog.stnn.cc/skin/rss_list.xsl" media="all"?><rss version="2.0"><channel><title>敏思博客_黑总</title><link>http://blog.stnn.cc/xyh1970830</link><description>随缘</description><item><title><![CDATA[我们确实缺乏逻辑思辨能力]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005556943.aspx</link><description><![CDATA[<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中国人大都缺乏一种正常的逻辑思辨能力，随着年龄的不断增长，我越是痛苦的认识到这个问题及其严重性，随便的举几个我们司空见惯的例子吧。</SPAN></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">小贩与市容</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">某日，与一朋友在大街上散步闲谈，因为是在晚饭后，大街上随处都可见许多小贩们在做生意，有挑担沿街叫卖的，也有推车占一个小“地盘”叫卖的，朋友不禁皱眉的说到：真讨厌，你看，这些小贩们将街道弄得这么的脏乱，严重的影响了市容。我当时感到很惊讶，我反问到：换位思考一下，如果你也处于这些小贩一样的境地，必须以做这种小生意谋生，你做还是不做？</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">小贩们做点小生意谋生，既没有偷也没有抢，靠的是自己的辛勤劳动，相对于那些雁过拔毛的公仆来说，至少没有损害其他人的利益，同时还给广大的民众以极大的方便，难道就因为影响了所谓的“市容”就要讨厌他们甚至消灭他们。但是，从广义的角度来看，在当前体制下，我们都是做生意的小贩，在当今中国，小贬们最怕的就是城管，我们何尝不怕。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">写到这儿，我不禁想起了林语堂先生的话：</SPAN><SPAN style="FONT-FAMILY: 宋体; COLOR: #494949" lang=EN-US>“</SPAN><SPAN style="FONT-FAMILY: 宋体; COLOR: #494949">中国就有这么一群奇怪的人<SPAN lang=EN-US>, </SPAN>本身是最底阶层<SPAN lang=EN-US>, </SPAN>利益每天都在被损害<SPAN lang=EN-US>,</SPAN>却具有统治阶级的意识<SPAN lang=EN-US>. </SPAN>在动物世界里找这么弱智的东西都几乎不可能。<SPAN lang=EN-US>”</SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">评先评优</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在中国，每年都有一个盛大的活动，那就是年度的“评优评先”，所谓“优秀与先进”是有指标名额的，以学校为例来说，指标通常都控制在</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">10%</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">左右。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">也不知道是哪个龟孙子想出来的这个“评优评先”的馊主意，其它不说，单单从逻辑上来分析，就狗屁不通。这种评选明显的目的是为了“激励”人们“上进”，希望大家都将自己的本职工作做好。但每年能获得“优秀与先进”的只是一小部分人，这就带来了问题，没有被评上的就应该不优秀了，这样，就成了“大部分人不优秀”，一个大部分民众都没有将自己工作做好的民族，还有什么前途！而我们国家统计部门却在年年的告诉我们，我们国家每年都在取得巨大的进步，那国家的进步的基础在哪儿？难道只靠的那一小部分“先进与优秀”人才？</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">假设一下，假设我们国民在党的教育下，全部都成为了全心全意的做好自己本职工作的人民，那这种评选就没有存在的意义，因为大家都先进都优秀，也就没有了先进与优秀。而现在我们每年的评选都只是一小部分才“优秀与先进”，说明当今的制度有缺陷，不利于国民工作积极性的发挥，所以才会出现“大部分人都不优秀”的结局，这不是有自打耳光的嫌疑吗！</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">慰问</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">要过年了，在电视上又常看到让人恶心的画面，一大群所谓的“低保户”整齐的“排列”在某广场的中央，每个人面前都摆着一袋大米、一桶油，接一下来就是例行的特写镜头，那就是我们的“领导们”手拿“红包”给这些困难户们一人一个以示“关怀”。更大的特写镜头就是这些得了“好处”的困难户们“感激”的话，党和国家没有忘记我们这些人，党和政府就是好啊！……</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这些人怎么就不想一想，他们为什么会在盛世中国下这么贫困，作为政府部门的公仆们，凭什么以“上帝”一样的心态对待自己的人民，你们应该感到惭愧才对。从下自下都没有思考为什么会这样。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">自古以来，国人对政府及官僚们的最大要求，就是希望出现“明君”与“贤臣”，但是从来就没有主动的想一下，自己也是国家的一员，也有参与管理的权利，虽有“天下兴亡，匹夫有责”的说法，但此话的内涵更多的强调普通老百姓的“义务”而漠视老百姓应该享有的“权利”。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这几年，“民生”这个词出现的频率很高，各个地方政府都在打“民生”牌，但是，从媒体的宣传来看，这种事关“民生”的诸多措施好像全部成为了一种政府对“民众”的施舍，有些慈善活动的意思。这就把关系弄反了，关于“民生”的事是政府份内的事。在民生这方面，我们与欧美国家的差距不只是一点。难道是欧美国家的公仆们素质高？非也，人的本性都是一样的。</SPAN></P>]]></description><author>黑总</author><pubDate>2012-1-2 19:14:05</pubDate></item><item><title><![CDATA[我们需要补上科学人文素养这堂课]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005536948.aspx</link><description><![CDATA[<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">近日，学校有一个高一的学生因为家庭原因和早恋，从教学楼的五楼纵身跳下，万幸的是，还没有造成死亡。让我感到十分郁闷的是，在该生跳楼之后，很多本是同学的学生居然用手机不断的拍照，而且迅速的传到网上，还有学生马上给电视台打电话，只是为了几十块钱的“奖励”，更有学生在事后“兴冲冲”跑到办公室来说：老师，我现在终于知道什么是自由落体运动了，基本上这些学生都成为“看客”，对同学的生命一点都不尊重。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">&nbsp;&nbsp;&nbsp; 昨天，又有一件事让我感到一般的中国人对生命的一种让人感到不可思议的“漠视”，前两天，附近一个煤矿死了一个工人，人们对此议论纷纷，当然，不是为生命的突然消逝叹息，而是关心年终奖又“泡汤”了。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我们国人对于生命的不尊重，可以说到了登峰造极的地步，不只是对于别人的生命不尊重，就是对于自己的生命同样的不尊重。在这种大环境下，哪里能够说什么“人的尊严”问题。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这几天，我都在想这件事，我在思考为什么会造成这种结果。深思之下，我觉得还是因为我们的教育出了问题，建国之后，我们都将国人教育成为了什么样的人呢？从上自下，缺乏对大自然的敬畏，认为“人定胜天”、“人有多大胆，地有多大产”……，最终导致国人没有任何“信仰”。政府在制定政策的时候，随心所欲，不按照经济规律，前有“人心决定产量”，现有“信心”挽救经济，大量的基础建设由于规划的不科学合理，将大好河山破坏得不成样子，现在都还记得童年时期的家乡的水是那么的清，就是小溪中也清澈见底，各种鱼儿在水中畅游，渔民在大河中可以打到上百斤的大鱼，而现在，小溪成为了排污的臭水沟，河中的鱼几乎灭绝。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我们号称是信仰“唯物主义”，但我们却不遵守自然规律与经济规律，这直接导致另一个恶果的产生：对生命的不尊重。所以才有那么多践踏生命的事件发生。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">实际上，生命产生于宇宙，在大自然面前，人类其实很渺小，我们只能在遵守自然规律的前提下才能免于灭亡。从来就没有什么“终极真理”，人类社会也是在不断的试图“改造自然”的过程中逐步认识到的，欧美国家在这一方面的认识将我们远远的摔在了后面。九十年前，我们就提出了尊重“科学”的主张，但这么多年来，我们其实并没有什么进步，我们需要补上科学人文素养这堂课，不然后果堪忧。</SPAN></P>
<P>&nbsp;</P>]]></description><author>黑总</author><pubDate>2011-12-14 0:47:20</pubDate></item><item><title><![CDATA[物理乱谈：宇宙与社会]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005471758.aspx</link><description><![CDATA[<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">按照宇宙大爆炸理论，现在的宇宙的形成是因为宇宙大爆炸初期，物质分布的微小不平衡，在万有引力作用下，物质聚拢成星系，经过漫长的演化，才有了现在美丽的宇宙。但是万有引力过于强大时也能让恒星形成黑洞，从而吞噬其引力范围内的所有物质，毁灭一切。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">其实，人类社会的发展过程与宇宙的形成过程是如此的相似，一个团体一个国家的形成，必须要有一个强大的“引力源”，但如果这个引力源过于强大，以至于没有什么力量能够对它产生足够的制衡作用，那最终就会使这个团体这个国家走向毁灭，正如黑洞的形成一样，这个强大得没有制衡力量的“引力源”最终会毁灭，既毁灭了这个国家这个社会，同时也毁灭了自身。所以，我们应该致力于找寻“平衡”，对于宇宙是如此，对于人类社会的演化同样挣脱不了这个规律。</SPAN></P>]]></description><author>黑总</author><pubDate>2011-10-7 17:39:38</pubDate></item><item><title><![CDATA[退化]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005442688.aspx</link><description><![CDATA[<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">暑假期间，电视天天都在上演“水浒传”与“西游记”，让我不得不又将原著重新看了一次，看完之后，有了新的认识，最大的体会就是，书中说的好多东西就不断的在我们当今社会发生，中华民族的数千年历史中出现的无数次轮回之事在当今社会时隐时现。</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">两部作品表面看上去没有什么联系，但却有一些共同的地方，其中让我印象最深的，就是作为国家机器的正规军远远比不上地方武装力量的战斗力强，而在正规的国家体制内部，也往往是一些平庸之辈位居高位，真正有战斗力的反而不受重用。在西游记中，悟空在年少不懂事的时候能够大闹天宫，打得十万天兵天将无还手之力，而在皈依我佛之后，在保护唐僧取经途中，与各种妖怪战斗的时候，却发现自己的战斗力其实并不是出类拔萃的，常常需要借助各路仙佛的帮助才能降伏这些妖魔，这些所谓的妖魔绝大部分其实都是所谓“体制”内的成员，神仙的道童、仙佛的坐骑、月宫的玉兔……这些体制内成员都有非凡的战斗力，常常将悟空打得找不着方向，那我们不仅要问，这些高高在上的所谓“天兵天将”是做什么吃的，难道也是凭借“关系”上位的。在水浒传中，梁山英雄在与朝廷的军队的战斗中，往往能轻松的将“天朝”大军打得落花流水，但在与地方武装的较量中，却占不了多少上风，小小一个祝家庄，就让宋江前后三次才艰苦的打下来，后来到了晁盖攻打曾头市时，甚至丢掉了性命，由些可见，当时的地方武装远比国家的正规军强悍，究其原因，还不是因为当时的朝政腐败，关键岗位被一群平庸之辈把持。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">学生时代，当我看了西游记的时候，很多时候，我都在想一个问题，当悟空大闹天宫的时候，为什么不将后来与悟空激战的所谓“妖魔”派上“前线”去，只需要一两个就足够了，天帝也不至于如此的狼狈，更不用我佛如来亲自出马了。现在，我终于明白了，<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:PersonName w:st="on" ProductID="吴老">吴老</st1:PersonName>先生是在以此影射社会现实。而让我感到悲哀的是，当今社会的现状何尝不是这样，上下层的正常流动体制已经丧失，正如印度电影“</SPAN><SPAN style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">流浪者”</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中那个大法官</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">拉贡纳特</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所说的那样：</SPAN><SPAN style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial; mso-fareast-language: ZH" lang=ZH>好人的儿子一定是好人</SPAN><SPAN style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">，</SPAN><SPAN style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial; mso-fareast-language: ZH" lang=ZH>贼的儿子一定是贼</SPAN><SPAN style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。“血统”决定结果，所以才有“官二代”、“富二代”的称谓，要找到一个好岗位与职业，与一个人的能力的大小没有太大的关系，大部分都在“拼爹”。而出身低下的大多数人，少有“出头”的机会，老老实实的所谓“勤劳致富”在当下已经越来越成为一个梦。这么下来的结果是什么，那当然是政府的整个执政水平的每况愈下，同时会导致普通民众的道德底线一再滑落。这本质上是一种全面的退化，退化的主要原因是“近亲繁殖”，从生物学的角度来说，近亲繁殖必然导致物种的基因退化，官员的近亲繁殖必然会导致政府的执政水平与效率全面下降，更会直接导致腐败的全面孳生，更为严重的是，由于没有有效的纠错机制，就好比是一个人的免疫系统被摧毁，最终的结果会是什么呢。</SPAN><SPAN style="COLOR: black" lang=EN-US><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; COLOR: black; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与水浒传中的宋朝相比，当时的宋朝还有许多强悍的地方武装，就好比是一种流行的说法：宋朝实行的是藏富于民的国策。当国家遇到内乱或者外敌入侵时，还有人可用。而我们现在的社会现状是所谓的“国富民穷”，一旦国家遇到外部的经济军事上的打击时，真的不知道应该如何应对！</SPAN><SPAN style="COLOR: black" lang=EN-US><o:p></o:p></SPAN></P>]]></description><author>黑总</author><pubDate>2011-9-4 16:47:42</pubDate></item><item><title><![CDATA[由小布什的所谓“低智商”传言想到的]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005389296.aspx</link><description><![CDATA[<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">&nbsp;&nbsp;&nbsp; 据说，美国前总统小布什的“智商”不到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">100</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，按照标准来看，是典型的低智商，但他却能胜任世界第一强国美国的总统职位。而反观咱们呢，自古以来，普通的中国老百姓的最大心愿就是希望官僚们勤勉、清廉、自律，当然最好能是超人，文能治国，武能安邦，所以，像唐太宗、汉武帝、包拯、狄仁杰、袁崇焕……之类才有大量的粉丝。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">&nbsp;&nbsp;&nbsp; 但是，数千年来的绝大数时间里面，贫穷、战乱却始终萦绕在普通中国老百姓的周围，更不用去奢望“尊严”了。究其原因，在于，普通中国老百姓没有决定自己命运的权力，中国自古以来都是少数人统治大多数人，而这被统治的大多数却不能参与到对国家的治理中来，归根到底还是一个社会的体制问题。为什么全世界的人民都向往美国！还不是因为人家的国家体制真正是为全民服务！看过美国建国时期制定的所谓“独立宣言”的人都知道，美国对政府的定义与我们一般中国人的理解大不相同，就像是一个小区内的业主与物管的关系，只是我们与人家正好相反！物管凌驾于业主之上，甚至业主没有自己聘请物管的权利。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">&nbsp;&nbsp;&nbsp; 正因为美国的国家体制与社会架构相对完美，所以，才有一少将曾经说过，在美国，就是一个白痴也能当好美国总统！真的希望咱们的民族有一天也能达到这种境界。当普通中国人没有了所谓英雄情结、清官情结的时候，当咱们再也不热衷于评选什么“最美的……、最感动……、最让人热爱……”的时候，你我才能真正的过上有尊严的幸福生活。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">&nbsp;&nbsp;&nbsp; </SPAN></P>]]></description><author>黑总</author><pubDate>2011-7-26 18:50:05</pubDate></item><item><title><![CDATA[我们没有资格质疑姜昆]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005382222.aspx</link><description><![CDATA[<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">日前，姜昆的假文凭事件在网上披露出来，而且拔出萝卜还带出泥，牵涉到许多的名人居然也是<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:PersonName w:st="on" ProductID="姜昆">姜昆</st1:PersonName>老师的“校友”，一时间，众多的网友对此事议论纷纷。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><st1:PersonName w:st="on" ProductID="姜昆"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">姜昆</SPAN></st1:PersonName><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">老师是我比较喜欢的相声演员之一，我是看着姜昆的相声度过我的青少年时期的，对<st1:PersonName w:st="on" ProductID="姜昆">姜昆</st1:PersonName>老师有好感，觉得<st1:PersonName w:st="on" ProductID="姜昆">姜昆</st1:PersonName>老师的相声表演功底深厚，在相声界应该为有实力的演员之一。这次假文凭事件之后，部分网友质疑之声不绝。其实，相声演员需要文凭吗？我看不需要。在当前中国，什么都要看所谓的文凭，而文凭真的就能代表一个人的实力吗？在中国，不说是全部，至少有相当一部分文凭代表不了一个人的能力的高低。按照我们的大学的培养模式培养出来的人，相当一部分为次品，这些人即使拥有清华、北大的文凭，也不能说明他们有多高的素质。更何况，现在的大学，即使是所谓“正规”的官办大学，也在年复一年的干着“贩卖”文凭的勾当，这其中，规模最大的莫过于“官员”们的文凭，中国的官员的学历之高，可能为世界之最，什么学士、博士官员数量庞大，这些公仆们即使一天也没有在学校学习，一样的可以毕业，一样的可以拿到文凭与学位。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在当今中国，造假之风盛行，不只是上层的官员们，即使是处于“下层”的一般中国人，何尝不是如此。上个世纪九十年代，我的好多同事都在“忙于”拿文凭，一个教音乐的同事，报考的地理专业，而且，平常很少学习，直到考试前一天仍然在麻将桌上“修长城”，后来还不是照样的拿到地理专业的文凭。现在职称的评定有一条硬“指标”，那就是必须要在一定级别的报刊上发表所谓的“论文”，但每年够级别的报刊刊登的论文数量远远的少于评定人员人数，怎么办，只有造假，现在可以说，大部分职称“论文”都是用钱买的，这与人家用钱去买大学文凭没有两样。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">当然，造假之风不只在教育行业，事实上，在当今中国的几乎所有行业都在造假，所以，当今中国人没有资格去质疑人家的假文凭，因为，一般的中国人自己的屁股都没有擦干净。</SPAN></P>]]></description><author>黑总</author><pubDate>2011-7-23 19:54:02</pubDate></item><item><title><![CDATA[从当前各大城市的“内涝”现象看中国人的“面子”]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005322717.aspx</link><description><![CDATA[<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">近段时间，很多地方普降大雨，随之出现的问题就是各大城市的所谓“内涝”问题，武汉是如此，首都北京还是如此，有网友讽刺说：哥出门不是忘记带雨伞，而是忘记带一艘船了。可见这些城市的地下排水排水系统是如何的落后。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为什么会出现这种问题呢？细想一下，还是中国人的重“面子”而不重“里子”的思维在作怪，这种思维方式已经深深的扎根于国人的内心深处，李宗吾大师在其名著《厚黑学》中曾经举了一个形象的例子来形容国人的一种心态，一个人受了箭伤，找外科医生看病，外科医将外面的箭杆剪断后对病人说：好了，请拿钱。病人问：可是我里面的箭头还没有取出来呀！外科医生说到：这不关我的事，剪掉里面箭头的工作属于内科医生的事！学生时代的我看到这儿的时候，还以为是李大师凭空想象出来的，不想真有这样的事发生，看来，民国时期的中国与现在也差不多。小时候，听父亲说过这样一个故事，说的是所谓“三年自然灾害”的一个普通人故事，一个人很要面子，为了表示自己家吃得好，每次出门前都要将挂在屋内的一块猪肉皮在嘴上抹两下，别人很羡慕他家有肉吃，但有谁知道此君常常空着肚皮呢！</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">国人的这种死要面子的性格在各个方面都体现出来，小到个人，大到政府，无不是如此。即使在咱们最贫穷的时代，宁愿自己的人民勒紧腰带，也会将大量的粮食钱物支援兄弟国家；想想为了体现我天朝盛世的盛景，咱们在举办各类大型运动会、世博会等等活动的时候，真的是不惜血本，单单是一个全运动会，就能将别的国家的奥运会比下去，一个上海世博会创造了多少世界第一。我们总是在不断的创造“奇迹”，让不明就里的外国“友人们”</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">“惊叹”不已，但我们还有大量的吃不饱饭、上不起学、看不起病的民众，我们的国家不能引领世界科技创造的潮流，在思想文化领域也没有什么建树。只有一样东东让人惊叹，那就是</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">GDP</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">迅速的“赶德超日”一跃成为世界的老二，这就是个面子问题，而真正的“里子”问题却没有解决，那就是现在的普通中国人的实际生活品质远远落后于</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">GDP</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的增速。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">近一两年在车上常常看到咱们的“新农村”建设起来的新居，外面确实光鲜，青瓦白墙，但到了室内一看，与从前没有什么大的变化，当然，农民兄弟的生活品质也没有什么大的提升。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">现在国家“重视”教育了，上至大学，下至小学，国家投入了大量的金钱，但这些钱都用到什么地方去了呢！都用到搞基建去了，于是各个省的“大学城”遍地开花，各个中小学的教学楼宿舍楼也不断的涌现，从外观来看，咱们的教育真的“追英赶美”了，但真正用在老师与学生身上的钱去少得可怜，用在教学必备的设施上也不多，为什么？因为只要“好看”就行了，哪里用得着管内在的教育品质的提升。就像现在所搞的所谓“新课程改革”，只重外在的形式，却不管实质的内容是否可行。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">国人的这种思维习惯贻害无穷。如果我是中国的敌对国家的人，如果深入的了解了这种思维方式与做事的方式，那只是从这次的“内涝”事件，就可以基本上确定中国是一支真正的“纸老虎”，根本就不足害怕！我们为什么在外国“欺负”咱们的时候强硬不起来，可能真的是我们的军队没有强硬起来的“本钱”，尽管每年国家在军队上投入了大量的金钱。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">看看青岛的地下排水系统，据说是北洋政府时期由当时的占领国德国修建的，到现在还是全国最好的排水系统之一，真不知道我们的政府官员们情何以堪。</SPAN></P>]]></description><author>黑总</author><pubDate>2011-6-25 18:21:52</pubDate></item><item><title><![CDATA[越南在南海问题上玩的是中国古代兵法]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005296280.aspx</link><description><![CDATA[<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我们与一些东南亚国家在南海的主权归属上有争议，咱们宣称对整个南海都有主权，而越南等东南亚国家却宣称他们对南海有主权，特别是近段时间，越南在南海的动作特别大，不只是在口头上宣称对南海的主权，更有越南民众到中国驻越南大使馆前进行“抗议”，同时在南海进行军事演习，甚至还放出狠话：还要到由中国控制的西沙群岛进行石油开发。这让咱们普通中国民众异常愤怒。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">实际上，由中越两国的实力对比来看，越南现在的做法是在实践我们的老祖宗的哲学思想，兵法有云：</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial">求其上，得其中；求其中，得其下，求其下，必败。越南的国力有限，之所以这么做，意在保住目前所占据的南海诸岛，所谓“为得其中，必求其上”，诸如“要到西沙群岛进行石油开发”之类的话不过是烟幕弹而已。</SPAN><SPAN style="FONT-FAMILY: Arial; mso-bidi-font-size: 10.5pt" lang=EN-US><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial">而我们做了什么呢？每次争端，我们最多也就是提口头抗议，什么实际行动也没有。这么做是“求其下”，只是宣称自己对南海有主权，但没有任何实际作为，只是幻想和平的拥有南海的主权，结果就是“必败”。按照国际相关法律，当一个国家对某地“占据”的时间达到某一值时，就“自动”拥有对此地的主权。而我们对南海的大多数岛屿并没有实际控制，时间已经到了临界值。所以现在不只是越南，好多东南亚国家都想在南海上分一杯羹，目前菲律宾在南海的一些岛屿上撤除由中国建立的标识就是明显的例子。按照目前的态势，我们不得不痛苦的看到，随着越南诸国不断的侵蚀，我们的子孙长大时，南海的部分甚至全部已经不再属于中国。</SPAN></P>]]></description><author>黑总</author><pubDate>2011-6-16 14:48:55</pubDate></item><item><title><![CDATA[当今的高考试题有“走火入魔”之嫌]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005281616.aspx</link><description><![CDATA[<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一年一度的高考又结束了。高考，让多少人为之癫狂，这么多年来，听说过有人为了考上理想学校而进行“八年抗战”的，有为高考差一分半分而疯掉的，有为高考迟到不能进入教室而跳楼自杀的……，总之，一到每年的高考，就好比进行一场大的战役，搞得多少人精疲力竭。究其原因，主要是因为在咱们这个国度，高考承载了大众太多的东西在里面。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">自从恢复高考以来，多少贫寒人家的孩子通过高考而进入上层社会，现在好多当官的就出身贫寒，通过自己的努力，获得了一个体面的职位，高考在促进“上下阶层”流动方面作出了不可磨灭的贡献，而阶层的流动是这个社会充满活力的不可或缺的因素。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">但是，现在的高考有“走火入魔”之嫌。我是教物理的，对每年的物理高考试题体会很深。我们的考试究竟是考察什么？既然是考试物理，就要考察学生的物理学方面的素养。而我们的考试题往往是剑走偏锋，着重于考察学生的“解题”能力去了，考察一个定律一个定理，出题的老师非要绕上几大弯来考察。物理中的数学应用颇多，但你不能将物理题出成数学题，而高考题中就常出现这样的题型，比如，带电粒子在复合场中的运动类型的题，每年几乎都在考试，但都侧重于考察学生的数学能力去了，前些日子，重庆的所谓“三诊”考试中有一个题，甚至要用到大学中的积分的知识才能做，当然，出题的老师给的答案是错的，原因是出题人也没有想到这个题要用积分才能做，而是凭“直觉”给了一个答案。很多学生觉得物理题难做，就在于数学这个槛。整个高三一年，老师都在反复的训练学生的“解题”能力，而学生在这种机械性的训练中迷失了，搞不清楚学习物理的本来目的是什么？当学生都成为解题的机器的时候，他就不会对物理现象的本质进行思考，更不会有什么创新的意识，当然也不会质疑课本上的知识了。难道课本上的东西都是对的吗？不尽然，要知道，我们现在中学所学的物理主干知识，是人家西方人在几百年前创立的。以牛顿第一定律为例，这个定律是这样叙述的：<SPAN style="LETTER-SPACING: 0.4pt">任何物体在不受任何外力的作用下，总保持匀速直线运动状态或静止状态，直到有外力迫使它改变这种状态为止。这么多年来，学生都在用这个定律解题，丝毫没有觉察到其中的问题。我曾经问过学生，你们怎么判断物体是“静止状态”或者是“匀速直线运动状态”？你们又是怎么判断物体是“受力”还是“不受力”？没有疑问，就没有创新，这可能就是我们新中国成立这么多年来也出不了大师级的顶尖人才的主要原因。</SPAN></SPAN><SPAN style="LETTER-SPACING: 0.4pt" lang=EN-US><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P>
<P style="TEXT-INDENT: 22.6pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不只是物理学科，其实所有学科都是如此，都侧重于解题去了。于是出现这样的现象，学习了</SPAN><SPAN style="LETTER-SPACING: 0.4pt" lang=EN-US><FONT face="Times New Roman">12</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.4pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">年的国语却写不出一篇像样的作文来，学习了十多年的英语却不会听英语不会读英文文章……，这不能不说是高考带来的一种悲哀！在这种体制下培养出的人必然缺乏基本的人文素养与科学素养，无论是从政或者是搞科学研究，必然会出现先天不足。现在全国都在大力的推进新课程改革，但愿今后的高考能在这方面得到改进。</SPAN></P>]]></description><author>黑总</author><pubDate>2011-6-11 3:15:36</pubDate></item><item><title><![CDATA[有感于“将老师纳入公务员系统”]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005280361.aspx</link><description><![CDATA[<P style="TEXT-INDENT: 18pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; COLOR: #333333; FONT-SIZE: 9pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">据报道，华中<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:PersonName ProductID="师范大学" w:st="on">师范大学</st1:PersonName>教授周洪宇提出，中国可以建立独立的教育公务员制度，将取得教师资格证书并获得教师职位的公办教师的身份确认为教育公务员，只有这样才能促进更多的优秀人才投入到教育行业，稳定老师队伍，提高我国的教育质量。这段时间，在网上还在进行这方面的投票，看了下，“赞同”与“反对”的旗鼓相当，不相上下。</SPAN><SPAN style="COLOR: #333333; FONT-SIZE: 9pt" lang=EN-US><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P>
<P style="TEXT-INDENT: 18pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; COLOR: #333333; FONT-SIZE: 9pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">作为一名老师，我认为这样一个提案没有任何意义。我于上个世纪</SPAN><SPAN style="COLOR: #333333; FONT-SIZE: 9pt" lang=EN-US><FONT face="Times New Roman">90</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; COLOR: #333333; FONT-SIZE: 9pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">年代初加入到“教书”这个“光荣高尚”的职业，开始的时候，老师是属于“干部”编制，也就是现在所谓的“公务员”，吃的是“皇粮”，不过，此干部不同于彼干部，仅仅担了一个虚名而已，与真正工作于政府部门的干部相比，福利待遇不可同日而语，这里就不多说了。但是，即使是这个虚名，政府也不愿意让你担多久，后来，政府将老师从“干部”队伍中“清理”出去，老师的身份变成了“专业技术”人员，现在看来，这好像就是为了之后给全国公务员实行所谓“工资改革”埋下伏笔，毕竟，<st1:PersonName ProductID="全国" w:st="on">全国</st1:PersonName>老师数量庞大，如果将老师与“干部”一起进行工资改革，会让政府部门多出相当大一部分钱，无论如何，也不得不说，我们的政府官员们智商是相当的高的。</SPAN><SPAN style="COLOR: #333333; FONT-SIZE: 9pt" lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp; </SPAN><o:p></o:p></FONT></SPAN></P>
<P style="TEXT-INDENT: 18pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; COLOR: #333333; FONT-SIZE: 9pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">好像是从</SPAN><SPAN style="COLOR: #333333; FONT-SIZE: 9pt" lang=EN-US><FONT face="Times New Roman">06</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; COLOR: #333333; FONT-SIZE: 9pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">年开始，公务员工资年年涨，而老师的工资却在原来的低水平上徘徊不前。当然，工资上涨太慢不只是老师这个职业，可以说全国绝大数人（农民、工人……）的工资</SPAN><SPAN style="COLOR: #333333; FONT-SIZE: 9pt" lang=EN-US><FONT face="Times New Roman">(</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; COLOR: #333333; FONT-SIZE: 9pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">收入</SPAN><SPAN style="COLOR: #333333; FONT-SIZE: 9pt" lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; COLOR: #333333; FONT-SIZE: 9pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">多年来都没有什么明显的上涨。千不该万不该的是，政府为了体现重视教育，年年宣传教育行业的重要性，并且称“教书这个职业是天底下最光辉的职业“，还规定了什么“老师节”，制定出了什么“教师法”，而且规定：老师收入不低于甚至高于当地公务员的平均收入水平。这就坏事了，本来，农民的收入也低，但中国的农民非常的“本分”，只要你不将农民兄弟吃饭的“土地”强征强拆，基本上不“闹事”；工人兄弟也差不多，只要还有一口稀饭喝，他们也不会主动的找政府“麻烦”，大家都还记得上个世纪大规模的工人“下岗”吧！政府可以像扔掉破鞋一样的将上千万的工人以“下岗”的名义清理掉，不得不佩服咱们国人的良好的素质。而老师则与工人与农民有不同之处，最大的不同可能就是自己认为读了多年的“圣贤书”，多少在内心深处有些古代的读书人的情节在里面，而政府又年年都在宣传教育的重要性，这就更加的加<st1:PersonName ProductID="强了" w:st="on">强了</st1:PersonName>老师们的一种“悲情”意识，<st1:PersonName ProductID="常有" w:st="on">常有</st1:PersonName>老师说，我们老师付出了多少多少，但我们的工资待遇却远远的低于公务员，心理上非常的不平衡，当然，这其中也有政府部门的不守信用，在多年前就说要给老师增加工资（也就是要增发绩效工资），但老师们却一年一年的失望。终于引来了老师们的情绪总爆发，好多地方不断的发生所谓的“罢课”事件，这才让政府决定赶快落实老师的绩效工资问题，但是，政府却只是先落实九年义务教育阶段的绩效问题，却不管非义务教育阶<st1:PersonName ProductID="段" w:st="on">段</st1:PersonName>老师的绩效问题，所以之后带来一系列问题，比如，对于偏远地区的高完中，同一所学校里面，教<st1:PersonName ProductID="高中的" w:st="on">高中的</st1:PersonName>老师比教初中的老师的收入要低上好大一截，后果怎样，大家能想象得到。所以，现在在学校实行绩效工资，是政府部门在老师压力下的一种被迫行为，作为政府部门，并没有主动为老师加薪的内在动力，即使将老师列为公务员系列，境遇也不会得到改善。</SPAN><SPAN style="COLOR: #333333; FONT-SIZE: 9pt" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-INDENT: 18pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; COLOR: #333333; FONT-SIZE: 9pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">从这个事上，我们不得不承认，“官本位”思想在中国社会的根深蒂固，更为深层次的是，在普通中国人的内心深处，“公平”思想的严重缺失。本来，老师这个职业与任何其它职业一样，仅仅是一个普通职业而已，教书并不比农民种庄稼更重要，也不比工人生产产品更重要，在现代社会的众多分工中，一环扣一环，任何一环都重要，都是不可缺失的。而偏偏就有一些人认为自己的行业是最重要的，政府部门是如此，好多的垄断部门也是这样认为的，包括相当一部分老师也是这么认为的……。我们不得不说，欧美国家的国家运作体系经过几百年的发展，确实是一个成熟公平的社会体系。想起“让子弹飞”中张麻子不断说的“公平，公平，他妈的还是公平”，建议我们的公仆们多看一下，老师也应该看一下，所有的中国人都应该看看。</SPAN></P>]]></description><author>黑总</author><pubDate>2011-6-10 12:15:23</pubDate></item><item><title><![CDATA[重庆市高2011级高三六校联考三诊试题理综物理部分]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005242414.aspx</link><description><![CDATA[<P style="TEXT-ALIGN: center" align=center><FONT size=3><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>2011</SPAN><SPAN style="FONT-FAMILY: 宋体">级高二六校联考三诊试题理综物理部分</SPAN></FONT></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> I </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">卷（选择题共</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> 126 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一、本部分包括</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">21</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">小题，每小题</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">6</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分，共</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">126</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分，每小题只有一个选项符合题意。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">14</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．下列说法正确的是（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> ) </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．随着科技发展，绝对零度是可以达到的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．用手捏面包，面包体积会缩小，说明分子间有空隙</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．当分子间的距离</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">增大时，分子间的作用力做负功，分子势能增大</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．热机中燃气的热能不可能全部转化成机械能</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">15</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．波源在坐标原点</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处的一列简皆横波沿</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">x</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">轴正方向传播，若</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> t = 0</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，波源开始振动，在</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t=0.5s</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">PM</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">间第一次形成如图所示的波形图，此时</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">x= <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="4" UnitName="m">4m</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点正好在波谷。那么，下列关于此列波的说法正确的是（</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．这列波的传播速度是</SPAN><FONT face="Times New Roman"><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="8" UnitName="m"><SPAN lang=EN-US>8m</SPAN></st1:chmetcnv><SPAN lang=EN-US>/s </SPAN></FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．波源开始振动的方向沿</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">y</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">轴正方向</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．当</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点开始振动时，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">P</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">质点通过的路程为</SPAN><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="30" UnitName="cm"><SPAN lang=EN-US><FONT face="Times New Roman">30cm</FONT></SPAN></st1:chmetcnv></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t=0.2s</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">P</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点第一次到达波峰</SPAN></P><SPAN lang=EN-US><?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" /><v:shapetype id=_x0000_t75 stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"><v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:lock aspectratio="t" v:ext="edit"></o:lock></v:shapetype>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169285.jpg" width=197 onload=javascript:resizepic(this) height=101></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center></SPAN><SPAN lang=EN-US><FONT face="Times New Roman">l6</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．宇宙中存在一些质量相等且离其它恒星较远的三颗星组成的三星系统（可忽略其它星体对它们的引力作用及它们的自转）。设三星系统中每个星体的质量均为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，半径均为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。三颗星稳定分布在边长为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">a</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的三角形的三个顶点上。已知引力常量为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">G</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。那么关于此三星系统，下列说法中错误的是</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">( </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．三颗星的轨道半径均为<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169286.gif" width=35 onload=javascript:resizepic(this) height=45></SPAN><SPAN lang=EN-US><SUB></SUB></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．三颗星表面的重力加速度均为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">Gm/R<SUP>2</SUP> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．三颗星运行的周期均为<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169287.gif" width=75 onload=javascript:resizepic(this) height=47></SPAN><SPAN lang=EN-US><SUB></SUB></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．三颗星围绕正三角形的角平分线的交点做匀速圆周运动</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">17</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．下列说法中正确的是（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> ) </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．玻璃中的气泡看起来特别明亮是光的全反射现象</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．海市蜃楼、沙漠蜃景都是由于光的衍射而产生的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．可见光是由原子内层电子受到激发后产生的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．看到的天空中的彩虹是由于光的衍射而产生的</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">18</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．某光电管的阴极为金属钾制成的，它的逸出功为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2.21eV</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，如图所示是氢原子的能级图，一群处于</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">n = 4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">能级的氢原子向低能级跃迁时，辐射的光照射到该光电管的阴极上，这束光中能使金属钾发生光电效应的光谱线条数是（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> )</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A. 2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">条</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B. 4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">条</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>C. 5</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">条</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>D. 6</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">条</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169288.jpg" width=107 onload=javascript:resizepic(this) height=132></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">19</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．理想变压器的原、副线圈接入如图所示的电路中，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L3</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为四只规格均为“</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">9V, 6W</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">”的相同灯泡，各电表均为理想交流电表。若输入端接入正弦交变电压</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">u</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，灯泡均能正常发光，则以下说法正确的是</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN>)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．电压表的示数为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">36V </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．电流表的示数为</SPAN><FONT face="Times New Roman"><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="2" UnitName="a"><SPAN lang=EN-US>2A</SPAN></st1:chmetcnv><SPAN lang=EN-US> </SPAN></FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．输入端交变电压的最大值为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">27<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169289.gif" width=25 onload=javascript:resizepic(this) height=23></FONT><SUB></SUB><FONT face="Times New Roman">V</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．变压器原、副线圈的匝数之比为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">4 : 1</FONT></SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169290.jpg" width=211 onload=javascript:resizepic(this) height=101></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">20</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．如图所示，虚线</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">a</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">b</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">c</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">d</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">表示匀强电场中的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个等势面。两个带电粒子</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（重力忽略不计）以平行于等势面的初速度射入电场，运动轨迹分别如图中</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">MPN</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">NQM</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示，己知</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是带正电的带电粒子．则（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> ) </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一定也带正电</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">a</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点的电势低于</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">b</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点的电势</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．带电粒子</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的动能减小，电势能增大</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．带电粒子</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的动能增大，电势能减小</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169291.jpg" width=129 onload=javascript:resizepic(this) height=139></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">21</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．如图所示，在光滑的水平地面上停放着一辆平板车，车上放有一木块</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。车左边紧靠一个固定的光滑的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1/4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">圆弧轨道，其底端的切线与车表面相平。木块</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">从轨道顶端由静止释放滑行到车上与木块</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">碰撞并立即粘在一起在车上滑行，与固定在平板车上的轻弹簧作用后被弹回，最后两木块与车保持相对静止。则木块</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">从接触开始到木块</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与车相对静止的全过程中，木块</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和车组成的系统（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> )</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．动量不守恒</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．小车先向右运动、后向左运动</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．机械能减少量等于木块与车之间的摩擦生热</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．弹簧的最大弹性势能小于木块与车之间的摩擦生热</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169292.jpg" width=170 onload=javascript:resizepic(this) height=85></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第</SPAN><SPAN style="FONT-FAMILY: 宋体"> Ⅱ</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">卷（非选择题</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">共</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">174</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">22.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> 18 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 1 ) ( 6 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）某同学用游标为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">20</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分度的卡尺测量一薄金属圆板的直径</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，用螺旋测微器测量其厚度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">d</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，示数如题</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">22 ( l </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）图所示。由图可读出</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">D =_________mm,d=_______mm</FONT></SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169293.jpg" width=440 onload=javascript:resizepic(this) height=111></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 2 ) ( 12 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）电源的输出功率</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">P</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跟外电路的电阻</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">有关。如图所示，是研究它们关系的实验电路。为了便于进行实验和保护蓄电池，给蓄电池串联了一个定值电阻</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R<SUB>0</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，把它们一起看作新电源（图中虚线框内部分）。新电源的内电阻就是蓄电池的内电阻和定值电阻</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R<SUB>0</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">之和用</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">表示，电源的电动势用</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">E</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">表示。</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">①</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">写出新电源的输出功率</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">P</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">跟</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">E</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的关系式：</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">____________________</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。（安培表、伏特表看作理想电表）。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">②</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在实物图中按电路图画出连线，组成实验电路。</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169294.jpg" width=500 onload=javascript:resizepic(this) height=131></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">③</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">表中给出了</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">6</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组实验数据，根据这些数据，在方格纸中画出</SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>P</SPAN><SPAN style="FONT-FAMILY: 宋体">—<SPAN lang=EN-US>R</SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">关系图线。根据图线可知，新电源输出功率的最大值约是</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">_________ w </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。当时对应的外电阻约是</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">___________,</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（电阻保留两位有效数字）</SPAN></P>
<TABLE style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; BORDER-COLLAPSE: collapse; BORDER-TOP: medium none; BORDER-RIGHT: medium none; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt; mso-border-alt: solid windowtext .5pt; mso-yfti-tbllook: 480; mso-border-insideh: .5pt solid windowtext; mso-border-insidev: .5pt solid windowtext" class=MsoTableGrid border=1 cellSpacing=0 cellPadding=0>
<TBODY>
<TR style="mso-yfti-irow: 0; mso-yfti-firstrow: yes">
<TD style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 60.85pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt" width=81>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman">U<SPAN style="mso-spacerun: yes">&nbsp; </SPAN>(V)</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 60.85pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width=81>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman">3.5</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 60.85pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width=81>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman">3.0</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 60.85pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width=81>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman">2.5</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 60.9pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width=81>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman">2.0</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 60.9pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width=81>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman">1.5</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 60.9pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width=81>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman">1.0</FONT></SPAN></P></TD></TR>
<TR style="mso-yfti-irow: 1; mso-yfti-lastrow: yes">
<TD style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 60.85pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width=81>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman">I<SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN>(A)</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 60.85pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width=81>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman">0.2</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 60.85pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width=81>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman">0.3</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 60.85pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width=81>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman">0.4</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 60.9pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width=81>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman">0.5</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 60.9pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width=81>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman">0.6</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 60.9pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width=81>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman">0.7</FONT></SPAN></P></TD></TR></TBODY></TABLE><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169295.jpg" width=265 onload=javascript:resizepic(this) height=152></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">23. (16</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）均匀导线制成的正方形闭合线框</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">abcd</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，每边长为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L, </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">总电阻为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，总质量为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。将其置于磁感强度为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的水平匀强磁场上方</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">h</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处，如图所示。线框由静止自由下落，线框平面保持在竖直平面内，且</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">cd</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">边始终与水平的磁场边界平行。当</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">cd</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">边刚进入磁场时，求：</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> (1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）线框中产生的感应电动势大小；</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(2 ) cd </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">两点间的电势差大小；</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(3</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）若此时线框加速度恰好为零，求线框下落的高度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">h</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所应满足的条件</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">.</FONT></SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169296.jpg" width=154 onload=javascript:resizepic(this) height=164></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">24. (18</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）如图所示，质量为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m<SUB>A</SUB> = <st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="True" SourceValue="4" UnitName="kg">4 kg</st1:chmetcnv> </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，长为</SPAN><FONT face="Times New Roman"><I style="mso-bidi-font-style: normal"><SPAN lang=EN-US>l</SPAN></I><SPAN lang=EN-US>=<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="1.5" UnitName="m">1.5m</st1:chmetcnv> </SPAN></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的长木板</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">放在水平面上，将质量为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m<SUB>B</SUB>=<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="2" UnitName="kg">2.0kg</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的物块</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（可视为质点）放在木板的左端，用轻绳通过滑轮将</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">连接，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A , A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与水平面间的动摩擦因数均为</SPAN><SPAN style="FONT-FAMILY: 宋体">μ</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">=0.4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，今对滑轮施加一个</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">24N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的水平恒力</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">F</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，如图所示，设最大静摩擦力等于滑动摩擦力，不计滑轮质量及绳与滑轮间的摩擦，取</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">g=<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="10" UnitName="m">10m</st1:chmetcnv>/s<SUP>2</SUP> </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，则：</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( l </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）施加恒力</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">F</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">后，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和水平面对</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的摩擦力各多大？</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 2 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）从开始作用经</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">tl=0.1s</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，撤去</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">F</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的同时将</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">F</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">直接作用在</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的右端，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">F</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的大小和方向均不变，请计算判断</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">最终是否会滑离</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169297.jpg" width=290 onload=javascript:resizepic(this) height=69></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">25. (20</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）如图所示，在水平地面上方边长为</SPAN><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="2" UnitName="l"><SPAN lang=EN-US><FONT face="Times New Roman">2L</FONT></SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的正方形</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">abcd</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">区域有方向竖直向上的匀强电场，三角形</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">bcd</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">区域内还有水平向里的匀强磁场。现将一质量</SPAN><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue=".3" UnitName="kg"><SPAN lang=EN-US><FONT face="Times New Roman">0.3kg</FONT></SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的物体</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">以初速度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">v<SUB>0</SUB>=<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="6" UnitName="m">6m</st1:chmetcnv>/s</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">从水平地面竖直向上抛出，物体恰能到达</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">bc</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">边中点</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，到达</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点的瞬间突然炸裂成质量分别为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m<SUB>l</SUB>=<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue=".2" UnitName="kg">0.2kg</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m<SUB>2</SUB>=0.lkg</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">且带等量异种电荷</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">q = <st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue=".1" UnitName="C">0.1C</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">P</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">Q</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">两块，炸裂后</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">P</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在正交电磁场中沿</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">Ob</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">向左做直线运动，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">Q</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在正交电磁场中先做匀速圆周运动，然后亦沿水平方向离开正方形区域。己知</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L=<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="1.2" UnitName="m">1.2m</st1:chmetcnv> </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，重力加速度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">g = <st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="10" UnitName="m">10m</st1:chmetcnv>/s<SUP>2</SUP> </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，不计空气阻力和</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">P</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">Q</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">间的库仑力，求：</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( l </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）物体</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">竖直上抛的最大高度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">h ; </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 2 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）电场强度的大小；</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 3 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">P</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">Q</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">落到水平地面上的距离。</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169298.jpg" width=134 onload=javascript:resizepic(this) height=160></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN><SPAN lang=EN-US>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169300.jpg" width=554 onload=javascript:resizepic(this) height=713></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169301.jpg" width=553 onload=javascript:resizepic(this) height=637><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169302.jpg" width=594 onload=javascript:resizepic(this) height=857></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>]]></description><author>黑总</author><pubDate>2011-5-26 19:34:03</pubDate></item><item><title><![CDATA[重庆市高2011级高三三诊试题理科综合物理部分]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005242401.aspx</link><description><![CDATA[<P style="TEXT-ALIGN: center; TEXT-INDENT: -28pt; MARGIN: 0cm 0cm 0pt 28pt; tab-stops: 21.0pt 126.0pt 231.0pt 315.0pt 409.5pt; mso-char-indent-count: -2.0" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">重庆市高</SPAN><FONT face=宋体><SPAN style="FONT-SIZE: 14pt" lang=EN-US>2011</SPAN><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 14pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">级考前冲刺测试卷</SPAN></FONT><SPAN style="FONT-SIZE: 14pt" lang=EN-US><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -36pt; MARGIN: 0cm 0cm 0pt 36pt; tab-stops: 21.0pt 126.0pt 231.0pt 315.0pt 409.5pt; mso-char-indent-count: -2.0" class=MsoNormal align=center><FONT face=宋体><SPAN style="FONT-FAMILY: 方正小标宋简体; FONT-SIZE: 18pt; mso-bidi-font-size: 14.0pt; mso-ascii-font-family: Calibri">理科综合能力测试物理部分</SPAN><SPAN style="FONT-SIZE: 18pt; mso-bidi-font-size: 14.0pt; mso-fareast-font-family: 方正小标宋简体" lang=EN-US><o:p></o:p></SPAN></FONT></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 26.25pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -1.5; mso-para-margin-left: .5gd" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 楷体_GB2312; FONT-SIZE: 14pt; mso-ascii-font-family: Calibri">第一部分</SPAN><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（选择题共</SPAN><SPAN lang=EN-US>126</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">分）</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><SPAN lang=EN-US><SPAN style="mso-tab-count: 1"><FONT face=宋体>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </FONT></SPAN></SPAN><SPAN style="FONT-FAMILY: 黑体; mso-ascii-font-family: Calibri">本部分包括</SPAN><SPAN style="mso-fareast-font-family: 黑体" lang=EN-US><FONT face=宋体>21</FONT></SPAN><SPAN style="FONT-FAMILY: 黑体; mso-ascii-font-family: Calibri">小题，每小题</SPAN><SPAN style="mso-fareast-font-family: 黑体" lang=EN-US><FONT face=宋体>6</FONT></SPAN><SPAN style="FONT-FAMILY: 黑体; mso-ascii-font-family: Calibri">分，共</SPAN><SPAN style="mso-fareast-font-family: 黑体" lang=EN-US><FONT face=宋体>126</FONT></SPAN><SPAN style="FONT-FAMILY: 黑体; mso-ascii-font-family: Calibri">分。每小题只有一个选项符合题意。</SPAN><SPAN style="mso-fareast-font-family: 黑体" lang=EN-US><o:p></o:p></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>14</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．下列说法正确的是</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN><SPAN style="mso-tab-count: 3">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．雨后的天空出现彩虹是光的衍射现象</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-tab-count: 1"></SPAN>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．光电效应现象说明了光具有波动性。</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN></SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．光的偏振现象说明光波是纵波</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>D</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．紫外线是原子的外层电子受到激发而产生的</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>15</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．重庆市某中学生在本校实验室利用一单摆做小角度摆动，通过实验得到摆球振动位移</SPAN><SPAN lang=EN-US>x</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">随时间</SPAN><SPAN lang=EN-US>t</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">变化的关系如题</SPAN><SPAN lang=EN-US>15</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">图所示，则下列说法正确的是</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．</SPAN><SPAN lang=EN-US>t=0</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">时刻摆球加速度为零，所受合外力为零</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN></SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．</SPAN><SPAN lang=EN-US>t=0</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">时刻与</SPAN><SPAN lang=EN-US>t=ls</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">时刻摆球的速度相同</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．该同学所用单摆摆长约为</SPAN></FONT><?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="1" UnitName="m"><SPAN style="FONT-FAMILY: 'Times New Roman'" lang=EN-US>1m</SPAN></st1:chmetcnv><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face=宋体>&nbsp; </FONT></SPAN></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>D</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．</SPAN><SPAN lang=EN-US>t=0.5s</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">时刻摆线的张力最大</SPAN><SPAN lang=EN-US> </SPAN></FONT></P><SPAN lang=EN-US><?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" /><v:shapetype id=_x0000_t75 stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"><v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><o:lock aspectratio="t" v:ext="edit"></o:lock></v:shapetype>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169252.jpg" width=152 onload=javascript:resizepic(this) height=120></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>16</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．质子一质子循环发生的核反应被认为是恒星能量的一种可能来源，具体的一个循环过程是这样的：两个质子（<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169253.gif" width=8 onload=javascript:resizepic(this) height=25></SPAN></FONT><SPAN lang=EN-US><SUB></SUB><FONT face=宋体>H</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）发生聚变，生成一个氘核（<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169254.gif" width=11 onload=javascript:resizepic(this) height=25></SPAN><SPAN lang=EN-US><SUB></SUB><FONT face=宋体>H</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">），生成的氘核（<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169254.gif" width=11 onload=javascript:resizepic(this) height=25></SPAN><SPAN lang=EN-US><SUB></SUB><FONT face=宋体>H</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）再与一个质子（<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169253.gif" width=8 onload=javascript:resizepic(this) height=25></SPAN><SPAN lang=EN-US><SUB></SUB><FONT face=宋体>H</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）聚变生成一个氦核（<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169255.gif" width=11 onload=javascript:resizepic(this) height=25></SPAN><SPAN lang=EN-US><SUB></SUB><FONT face=宋体>He</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">），接下来两个氦核（<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169255.gif" width=11 onload=javascript:resizepic(this) height=25></SPAN><SPAN lang=EN-US><SUB></SUB><FONT face=宋体>He</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）发生聚变，生成氦的同位素（<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169256.gif" width=11 onload=javascript:resizepic(this) height=25></SPAN><SPAN lang=EN-US><SUB></SUB><FONT face=宋体>He</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）同时再产生两个质子（<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169253.gif" width=8 onload=javascript:resizepic(this) height=25></SPAN><SPAN lang=EN-US><SUB></SUB><FONT face=宋体>H</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">），这两个质子（<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169253.gif" width=8 onload=javascript:resizepic(this) height=25></SPAN><SPAN lang=EN-US><SUB></SUB><FONT face=宋体>H</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）再度发生聚变……进入下—个循环反应，成为恒星不竭之能量源泉．对于这种质子一质子循环发生的核反应，则下列说法正确的是</SPAN><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．两个质子（<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169253.gif" width=8 onload=javascript:resizepic(this) height=25></SPAN></FONT><SPAN lang=EN-US><SUB></SUB><FONT face=宋体>H</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）发生聚变，可表示为：<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169257.gif" width=135 onload=javascript:resizepic(this) height=25></SPAN><SPAN lang=EN-US><SUB></SUB></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．两个质子（<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169253.gif" width=8 onload=javascript:resizepic(this) height=25>H</SPAN></FONT><SPAN lang=EN-US><SUB></SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）发生聚变：可表示为：<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169258.gif" width=112 onload=javascript:resizepic(this) height=25></SPAN><SPAN lang=EN-US><SUB></SUB></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．一个完整的质子—质子循环核反应可表示为：<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169259.gif" width=116 onload=javascript:resizepic(this) height=25></SPAN></FONT><SPAN lang=EN-US><SUB></SUB></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>D</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．一个完整的质子—质子循环核反应可表示为：<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169260.gif" width=120 onload=javascript:resizepic(this) height=25></SPAN></FONT><SPAN lang=EN-US><SUB></SUB></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>17</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．在竖直向下的匀强电场中，有</SPAN><SPAN lang=EN-US>a</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>b</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">两个带电液滴，分别竖直向下和竖直向上做匀速直线运动（如题</SPAN><SPAN lang=EN-US>17</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">图所示），不计液滴同的相互作用力。下列说法正确的是</SPAN><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．</SPAN><SPAN lang=EN-US>a</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>b</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">带异种电荷</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．</SPAN><SPAN lang=EN-US>a</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>b</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">均带正电荷</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．</SPAN><SPAN lang=EN-US>a</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的电势能增大，机械能增大</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>D</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．</SPAN><SPAN lang=EN-US>b</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的电势能减小，机械能增大</SPAN></FONT></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169261.jpg" width=128 onload=javascript:resizepic(this) height=118></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>18</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．如题</SPAN><SPAN lang=EN-US>18</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">图所示，活塞将封闭在气缸内的理想气体分成甲、乙两部分，气缸、活塞（连同拉杆）是绝热的，气缸与活塞之间不漏气，活塞处手平衡状态．用</SPAN><SPAN lang=EN-US>E</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">甲</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>E</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">乙</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">分别表示甲、乙两部分气体的内能，用</SPAN><SPAN lang=EN-US>P</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">甲</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>P</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">乙</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">分别表示甲、乙两部分气体的压强．则在用力将拉杆缓慢向右推动的过程中，下列说法正确的是</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-tab-count: 3">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．</SPAN><SPAN lang=EN-US>E</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">甲</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>E</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">乙</SPAN></SUB></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">都不变，<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169262.gif" width=60 onload=javascript:resizepic(this) height=24></SPAN><SPAN lang=EN-US><SUB></SUB></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．</SPAN><SPAN lang=EN-US>E</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">甲</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">减小、</SPAN><SPAN lang=EN-US>E</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">乙</SPAN></SUB></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">增大，<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169263.gif" width=59 onload=javascript:resizepic(this) height=24></SPAN><SPAN lang=EN-US><SUB></SUB></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．</SPAN><SPAN lang=EN-US>E</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">甲</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">与</SPAN><SPAN lang=EN-US>E</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">乙</SPAN></SUB></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">之和不变，</SPAN><SPAN lang=EN-US><SUB><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169263.gif" width=59 onload=javascript:resizepic(this) height=24></SUB></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>D</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．</SPAN><SPAN lang=EN-US>E</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">甲</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">与</SPAN><SPAN lang=EN-US>E</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">乙</SPAN></SUB></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">之和增加，</SPAN><SPAN lang=EN-US><SUB><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169262.gif" width=60 onload=javascript:resizepic(this) height=24></SUB></SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169264.jpg" width=105 onload=javascript:resizepic(this) height=75></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>19</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．如图</SPAN><SPAN lang=EN-US>19</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">图所示，竖直放置在水平面上的轻弹簧上叠放着两个物块</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，它们质量都是</SPAN><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="2" UnitName="kg"><SPAN lang=EN-US>2kg</SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，都处于静止状态，若突然将一个大小为</SPAN><SPAN lang=EN-US>10N</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的竖直向上的拉力作用在</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">上，在此瞬间，</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">对</SPAN><SPAN lang=EN-US>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的压力大小为</SPAN><SPAN lang=EN-US><SPAN style="mso-tab-count: 2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="mso-ansi-language: PT-BR" lang=PT-BR>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-ansi-language: PT-BR">．</SPAN><SPAN style="mso-ansi-language: PT-BR" lang=PT-BR>15N<SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-ansi-language: PT-BR">．</SPAN><SPAN style="mso-ansi-language: PT-BR" lang=PT-BR>20N<o:p></o:p></SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN style="mso-ansi-language: PT-BR" lang=PT-BR><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-ansi-language: PT-BR">．</SPAN><SPAN style="mso-ansi-language: PT-BR" lang=PT-BR>25N<SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>D</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-ansi-language: PT-BR">．</SPAN><SPAN style="mso-ansi-language: PT-BR" lang=PT-BR>30N<o:p></o:p></SPAN></FONT></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169265.jpg" width=143 onload=javascript:resizepic(this) height=104></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>20</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．如图</SPAN><SPAN lang=EN-US>20</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">图所示，一空间内有磁感应强度大小均为</SPAN><SPAN lang=EN-US>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的两匀强磁场区域以半径为</SPAN><SPAN lang=EN-US>R</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的圆周为界，圆周内磁场方向垂直纸面向里，圆周外磁场方向垂直纸面向外且范围足够大。一质量为</SPAN><SPAN lang=EN-US>m</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、电量为</SPAN><SPAN lang=EN-US>q</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的粒子以速度</SPAN><SPAN lang=EN-US>v<SUB>0</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">从圆周上的</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">点正对圆心</SPAN><SPAN lang=EN-US>O</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">进入圆周内磁场，不许粒子重力和空气阻力，已知<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169266.gif" width=65 onload=javascript:resizepic(this) height=41></SPAN></FONT><SPAN lang=EN-US><SUB></SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，粒子经过时间</SPAN><FONT face=宋体><SPAN lang=EN-US>t</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">再次到达</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">点，则时间t</SPAN></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">至少为</SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169267.gif" width=29 onload=javascript:resizepic(this) height=44></SPAN></FONT><SPAN lang=EN-US><SUB></SUB><FONT face=宋体><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169268.gif" width=37 onload=javascript:resizepic(this) height=44></SPAN><SPAN lang=EN-US><SUB></SUB></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169269.gif" width=37 onload=javascript:resizepic(this) height=44></SPAN></FONT><SPAN lang=EN-US><SUB></SUB><FONT face=宋体><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169270.gif" width=37 onload=javascript:resizepic(this) height=44></SPAN><SPAN lang=EN-US><SUB></SUB></SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169271.jpg" width=217 onload=javascript:resizepic(this) height=104></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>21</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．一直角轻杆两边等长．两端分别固定质量为</SPAN><SPAN lang=EN-US>m<SUB>1</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的小球</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">和质量为</SPAN><SPAN lang=EN-US>m<SUB>2</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的小球</SPAN><SPAN lang=EN-US>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，质量关系为<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169272.gif" width=72 onload=javascript:resizepic(this) height=27></SPAN></FONT><SPAN lang=EN-US><SUB></SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，轻杆能绕水平转轴</SPAN><FONT face=宋体><SPAN lang=EN-US>O</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">在竖直面内转动，现使</SPAN><SPAN lang=EN-US>OB</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">水平，如题</SPAN><SPAN lang=EN-US>21</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">图所示，两小球从静止开始运动，经过一段时间轻杆转过θ角．不计转轴摩擦和空气阻力，两小球可视为质点，下列说法正确的是</SPAN><SPAN lang=EN-US><SPAN style="mso-tab-count: 2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．θ角最大可达到</SPAN><SPAN lang=EN-US>150</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">°</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．当θ</SPAN><SPAN lang=EN-US>=90</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">°时，两小球速度最大</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN></SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．当θ</SPAN><SPAN lang=EN-US>=30</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">°时，两小球速度最大</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>D</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．当θ</SPAN><SPAN lang=EN-US>=60</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">°时，两小球速度最大</SPAN></FONT></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169274.jpg" width=200 onload=javascript:resizepic(this) height=122></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -28pt; MARGIN: 0cm 0cm 0pt 28pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 楷体_GB2312; FONT-SIZE: 14pt; mso-ascii-font-family: Calibri">第二部分</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（非选择题</SPAN><FONT face=宋体> <SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">共</SPAN><SPAN lang=EN-US>174</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">分）</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>22</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．（</SPAN><SPAN lang=EN-US>19</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">分）</SPAN></FONT></P>
<P style="TEXT-INDENT: -5.25pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -.5; mso-para-margin-left: 1.5gd" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><FONT face=宋体><SPAN lang=EN-US>1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）如题</SPAN><SPAN lang=EN-US>22-1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">图所示，在验证动量守恒的实验中：</SPAN></FONT></P>
<P style="TEXT-INDENT: -5.25pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -.5; mso-para-margin-left: 1.5gd" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">①关于小球的落点，下列说法正确的是</SPAN><U><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN></U><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">。</SPAN></FONT></P>
<P style="TEXT-INDENT: -5.25pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -.5; mso-para-margin-left: 1.5gd" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．如果小球每次从斜槽的同一位置由静止滑下，重复几次的落点一定是完全重合的</SPAN></FONT></P>
<P style="TEXT-INDENT: -5.25pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -.5; mso-para-margin-left: 1.5gd" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．由于偶然因素存在，重复操作时小球的落点不会完全重合，但是落点应当比较密集</SPAN></FONT></P>
<P style="TEXT-INDENT: -26.25pt; MARGIN: 0cm 0cm 0pt 42pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.5; mso-para-margin-left: 1.5gd" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．测定落点</SPAN><SPAN lang=EN-US>P</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的位置时，如果几次落点的位置分别为</SPAN><SPAN lang=EN-US>P<SUB>1</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>P<SUB>2</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、…</SPAN><SPAN lang=EN-US>P<SUB>n</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，则落点的平均位置<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169273.gif" width=179 onload=javascript:resizepic(this) height=43></SPAN></FONT><SPAN lang=EN-US><SUB></SUB></SPAN></P>
<P style="TEXT-INDENT: -5.25pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -.5; mso-para-margin-left: 1.5gd" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN>D</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．尽可能用最小的圆把各个落点圈住，这个圆的圆心位置就</SPAN></FONT></P>
<P style="TEXT-INDENT: 15.75pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: 1.5; mso-para-margin-left: 2.0gd" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">是小球落点的平均位置</SPAN></P>
<P style="TEXT-INDENT: -26.25pt; MARGIN: 0cm 0cm 0pt 42pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.5; mso-para-margin-left: 1.5gd" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">②实验中记录了碰撞前，后小球落点的平均位置</SPAN><SPAN lang=EN-US>P</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>M</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">和</SPAN><SPAN lang=EN-US>N</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，如果碰撞是弹性碰撞，则三段距离</SPAN><SPAN lang=EN-US>OM</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>OP</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>ON</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的数值应该满足的关系是：</SPAN><SPAN lang=EN-US>OP=<U><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></U></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">。</SPAN></FONT></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -42pt; MARGIN: 0cm 0cm 0pt 42pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -4.0" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169275.jpg" width=179 onload=javascript:resizepic(this) height=108></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -42pt; MARGIN: 0cm 0cm 0pt 42pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -4.0" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-INDENT: -42pt; MARGIN: 0cm 0cm 0pt 42pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -4.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><FONT face=宋体><SPAN lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）现通过以下实验探究电源输出功率与电源内阻和负载电阻的关系。采用的器材为：电源，电阻箱</SPAN><SPAN lang=EN-US>R</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，安培表（内阻可忽略），电键，导线等。</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．根据需要设计好实验电路图并请画在虚框中。</SPAN></FONT></P>
<P style="TEXT-INDENT: -42pt; MARGIN: 0cm 0cm 0pt 42pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -4.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．按电路图连接好线路在闭合电键前已将电阻箱调到最大值）。合上电键，逐次减小电阻箱</SPAN><SPAN lang=EN-US>R</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的值。</SPAN></FONT></P>
<P style="TEXT-INDENT: -42pt; MARGIN: 0cm 0cm 0pt 42pt; tab-stops: 26.25pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -4.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．读取并记录电阻箱值</SPAN><SPAN lang=EN-US>R</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">及对应电流表的数值</SPAN><SPAN lang=EN-US>I</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，计算出相应的电源输出功率</SPAN><SPAN lang=EN-US>P</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">值．根据所得数据绘出</SPAN><SPAN lang=EN-US>P</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">—</SPAN><SPAN lang=EN-US>R</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">关系曲线（如题</SPAN><SPAN lang=EN-US>22-2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">图所示）。</SPAN></FONT></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -42pt; MARGIN: 0cm 0cm 0pt 42pt; tab-stops: 26.25pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -4.0" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169276.jpg" width=500 onload=javascript:resizepic(this) height=187></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -42pt; MARGIN: 0cm 0cm 0pt 42pt; tab-stops: 26.25pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -4.0" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-INDENT: -42pt; MARGIN: 0cm 0cm 0pt 42pt; tab-stops: 26.25pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -4.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">从</SPAN><SPAN lang=EN-US>P</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">—</SPAN><SPAN lang=EN-US>R</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">图上可以看出：</SPAN><U><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><o:p></o:p></SPAN></U></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">①当</SPAN><SPAN lang=EN-US>R=<U><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></U></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">Ω时，电源输出功率最大；</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">②最大输出的功率</SPAN><SPAN lang=EN-US>P<SUB>M</SUB><U><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></U>W<SUB>t</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">。</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">③计算出所用电源电动势</SPAN><SPAN lang=EN-US>E=<U><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></U>V</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">。（以上数据均保留两位有效数字）</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>23</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．（</SPAN><SPAN lang=EN-US>16</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">分）</SPAN><SPAN lang=EN-US> </SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">要发射一颗人造地球卫星，使它在预定轨道上绕地球做匀速圆周运动，为此先将卫星发射到近地暂行轨道上绕地球做匀速圆周运动，如题</SPAN><SPAN lang=EN-US>23</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">图所示，在</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">点，使卫星速度增加，从而使卫星进入一个椭圆的转移轨道上，当卫星到达转移轨道的远地点</SPAN><SPAN lang=EN-US>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">时，再次改变卫星速度，使它进入预定轨道运行，已知地球表面的重力加速度大小为</SPAN><SPAN lang=EN-US>g</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，近地暂行轨道半径为地球的半径</SPAN><SPAN lang=EN-US>R</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">。求：</SPAN></FONT></P>
<P style="TEXT-INDENT: -5.25pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -.5; mso-para-margin-left: 1.5gd" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><FONT face=宋体><SPAN lang=EN-US>1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）卫星近地暂行轨道上绕地球做匀速圆周运动的速度大小和周期；</SPAN></FONT></P>
<P style="TEXT-INDENT: -5.25pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -.5; mso-para-margin-left: 1.5gd" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><FONT face=宋体><SPAN lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）若卫星从</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">点到</SPAN><SPAN lang=EN-US>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">点所需的时间为</SPAN><SPAN lang=EN-US>t</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，试求：卫星预定轨道半径．</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face=宋体><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169277.jpg" width=143 onload=javascript:resizepic(this) height=151></FONT></o:p></SPAN></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center><SPAN lang=EN-US><o:p><FONT face=宋体>&nbsp;</FONT></o:p></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>24</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．（</SPAN><SPAN lang=EN-US>18</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">分）</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">如题</SPAN><SPAN lang=EN-US>24-1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">图所示，</SPAN><SPAN lang=EN-US>abcd</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">是位于竖直平面内的边长为</SPAN></FONT><I style="mso-bidi-font-style: normal"><SPAN style="FONT-FAMILY: 'Times New Roman'" lang=EN-US>l</SPAN></I><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的正方形闭合金属线框，金属线框的质量为</SPAN><FONT face=宋体><SPAN lang=EN-US>m</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，电阻为</SPAN><SPAN lang=EN-US>R</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，在金属线框的下方有一匀强磁场区，</SPAN><SPAN lang=EN-US>MN</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">和</SPAN><SPAN lang=EN-US>PQ</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">是匀强磁场区域的水平边界，并与线框的</SPAN><SPAN lang=EN-US>cd</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">边平行，磁场方向与线框平面垂直，现金属线框由距</SPAN><SPAN lang=EN-US>MN</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的某一高度从静止开始下落，题</SPAN><SPAN lang=EN-US>24-2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">图是金属线框由开始下落到完全穿过匀强磁场区域瞬间的</SPAN><SPAN lang=EN-US>v-t</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">图象，图象中</SPAN><SPAN lang=EN-US>v<SUB>1</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>v<SUB>2</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>v<SUB>3</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">均为已知量，重力加速度为</SPAN><SPAN lang=EN-US>g</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，不计空气阻力，求：</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><SPAN lang=EN-US>1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）磁场的磁感应强度；</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><SPAN lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）金属线框从静止开始下落至速度达到</SPAN><SPAN lang=EN-US>v<SUB>3</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">过程所经历的时间；</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><SPAN lang=EN-US>3</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）金属线框在整个下落过程中所产生的热量。</SPAN></FONT></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169278.jpg" width=309 onload=javascript:resizepic(this) height=156></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>25</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">．（</SPAN><SPAN lang=EN-US>19</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">分）</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">如题</SPAN><SPAN lang=EN-US>25</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">图所示，在水平长直的轨道上，有一长度为</SPAN><SPAN lang=EN-US>L</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的平板车在外力控制下始终保持速度</SPAN><SPAN lang=EN-US>v<SUB>0</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">做匀速直线运动．某时刻将一质量为</SPAN><SPAN lang=EN-US>m</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，可视为质点的小滑块轻放到车面距右端</SPAN><SPAN lang=EN-US>L/3</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的</SPAN><SPAN lang=EN-US>c</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">处，滑块刚好停在小车左端</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">处，设定平板车上表面各处粗糙程度相同。</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><SPAN lang=EN-US>1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）求滑块和平板车摩擦产生的内能；</SPAN></FONT></P>
<P style="TEXT-INDENT: -26.25pt; MARGIN: 0cm 0cm 0pt 42pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.5; mso-para-margin-left: 1.5gd" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><FONT face=宋体><SPAN lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）若平板车车速为</SPAN><SPAN lang=EN-US>2v<SUB>0</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">且保持不变，当滑块轻放到车面</SPAN><SPAN lang=EN-US>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">处的同时对该滑块施加一个与车运动方向相同的恒力</SPAN><SPAN lang=EN-US>F</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，要保证滑块不能从车的左端</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">处掉下，恒力</SPAN><SPAN lang=EN-US>F</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">大小应该满足什么条</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">件</SPAN><SPAN lang=EN-US>?</SPAN></FONT></P>
<P style="TEXT-INDENT: -26.25pt; MARGIN: 0cm 0cm 0pt 42pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.5; mso-para-margin-left: 1.5gd" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><FONT face=宋体><SPAN lang=EN-US>3</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）在（</SPAN><SPAN lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）的情况下，力</SPAN><SPAN lang=EN-US>F</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">取最小值，要保证滑块不从车上掉下，力</SPAN><SPAN lang=EN-US>F</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的作用时间应该在什么范围内？</SPAN></FONT></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><v:shape style="Z-INDEX: -2; POSITION: absolute; TEXT-ALIGN: left; MARGIN-TOP: 10.25pt; WIDTH: 189.75pt; HEIGHT: 51pt; MARGIN-LEFT: 147pt; LEFT: 0px" id=_x0000_s1027 type="#_x0000_t75"><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image066.png"></v:imagedata></v:shape></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face=宋体>&nbsp;<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169279.jpg" width=253 onload=javascript:resizepic(this) height=68></FONT></o:p></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face=宋体>&nbsp;</FONT></o:p></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face=宋体>&nbsp;<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169282.gif" width=604 onload=javascript:resizepic(this) height=829></FONT></o:p></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face=宋体><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/05/1005169281.gif" width=604 onload=javascript:resizepic(this) height=841></FONT></o:p></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face=宋体>&nbsp;</FONT></o:p></SPAN></P>
<P style="TEXT-INDENT: -21pt; MARGIN: 0cm 0cm 0pt 21pt; tab-stops: 21.0pt 125.85pt 230.75pt 335.6pt 409.05pt; mso-char-indent-count: -2.0" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face=宋体>&nbsp;</FONT></o:p></SPAN><SPAN style="COLOR: white; mso-bidi-font-size: 12.0pt" lang=EN-US><FONT face=宋体>.c.o.m<o:p></o:p></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="DISPLAY: none; COLOR: #f2f2f2; mso-bidi-font-size: 12.0pt; mso-hide: all" lang=EN-US><FONT face=宋体>www.ks5u.com</FONT></SPAN><SPAN style="DISPLAY: none; COLOR: white; mso-bidi-font-size: 12.0pt; mso-hide: all" lang=EN-US><o:p></o:p></SPAN></P>]]></description><author>黑总</author><pubDate>2011-5-26 19:24:05</pubDate></item><item><title><![CDATA[我们的世界观]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005195142.aspx</link><description><![CDATA[<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">近来，我给学生布置了一个作业：如果你能穿越时空，你将会想到做什么？</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">作业一收上来，看完之后，感叹咱们的学生想象力太欠缺，同时，思想太狭隘。其中好多学生都有这样的的想法：我如果能够穿越时空，我会回去把日本人全部杀光，以免日本人来侵略咱们，杀我们的国民。不得不承认，我们的教育确实厉害，将咱们的下一代都都教育成了有如此强烈“爱国”情操的人。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我问学生，你们为什么这么恨日本人？学生回答：当年，日本人在中国屠杀了咱们那么多的同胞，我当然恨！</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我不得不耐心的对学生说，你们这种观念太狭隘，首先凭你们的能力，即使能回到二战时期，你也不是日本人的对手。再退一步讲，你真的有能力，将日本人都杀光了，难道咱们中国就安全了？到时，还会有其它的国家其它民族会“侵略”咱们，美国、英国、法国……等等，都曾经“侵略”过咱们，都屠杀过咱们的同胞，你们是不是也要回去将这此国家的人全部杀光！你们想过为什么人家会“侵略”咱们没有？在你们的内心深处种下如此深的的恨，有用吗？</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我接着对学生说：你们现在恨不恨蒙古人、满族人？学生回答：不恨，为什么要恨？我说：按照你们恨日本的逻辑，你们最应该恨的不是日本人，而应该是蒙古人，在元朝对宋的征服战争中，死于蒙古铁骑的宋人不下千万人，日本人的屠杀与蒙古人的屠杀相比，是小巫见大巫而已，而且不要忘记了，宋时还处于所谓的“冷兵器”时代，可见蒙古人是多么的残暴！我接着问：难道你不想回去将蒙古人全部杀光？学生无语。我接着给学生简述了一下满清入关之后所做的事，像著名的“扬州十日”、“嘉定三屠”之类的事还少了么，那你们是不是也要回去将满族人杀光？</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我又对学生说：如果你是一些少数民族族人，比如苗族，你会不会恨汉人？学生说：不会恨！我问：为什么呢？学生回答：汉族又没有去屠杀这些少数民族，为什么要恨汉人呢？听到这儿，我真的觉得我们的历史教育有大问题，我问学生：你们听说过张骞出使西域的故事吧！学生都答：知道。我又问：你们知道当时的所谓西域在哪儿吗？后来好多的西域国家被汉所灭最后归于汉朝版图，按照你们的逻辑，这些国家的人民恨不恨汉人？学生们又无语！</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这让我联想起前段时间我们的官方说，咱们中华没有侵略别的国家的“传统”（意思是咱们历史上基本上没有侵略过别的国家），有一个网友也说我们中国从来就没有侵略过别国！我想不通的是，我“中国”的版图一开始就是这么大的吗？为什么我们不把历史的真相告诉学生，而是将谎言一代代的传下去，对我们这个民族有好处吗？我们的历史教育基本上是这样的：只将别的国家对我们的侵略史告诉学生，在学生心中种下仇恨的种子的同时，却不告诉我们为什么会遭遇到别国的侵略，不去反省自身的原因，不去反思怎样才能“强国”，怎样才能不会遭遇别国的侵略与欺负！比如，在讲到甲午战争时，基本上都说到我们赔偿给日本多少白银，又说日本靠这些赔款成长为一个国力强大的国家！却不给学生讲，日本的强大是因为自明治维新以来向西方先进文明学习的结果！靠的是日本人特有的民族性发展壮大起来的！假使将这一笔钱给当时已经腐朽没落的清朝政府，咱们中国一样的贫弱，一样的会被别国侵略，因为这些钱肯定不会用于发展国力上，而是被大大小小的贪官瓜分。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">前段时间，日本的大地震、大海啸造成数万无辜的日本人丧命，在全世界都对此表示深切的同情的时候，我们有相当一部分国民的表现却让人失望，理由都是当年日本对我们的侵略！</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">本拉登被美军击毙，本应该是一件好事，但据网上调查，有差不多</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">60%</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的国人却对拉登表示尊敬，有些网友甚至将拉登比作刺杀秦王的荆柯，全然没有想到死在拉登手下的无辜民众有多少！</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这个世界号称是一个文明的世界，但请大家任何时候都不要忘记，丛林法则在任何时代都是一个普遍的法则，落后就会被淘汰，这是自然法则，从古自今有多少文明消失不见，有多少民族消亡，他们还怎么恨！这个世界还不是照样的运转下去！历史需要我们去了解真相，我们只能从“自强”入手，而不应该只记住以往的所谓仇恨，不然，我们这个民族还将重复过去的悲惨经历！再说了，如果因为仇恨就要杀光“对手”，那我估计会有这一天，除了他自己，任何人都可能被杀掉！这其实是一种典型的小国寡民的思维方式！不值得提倡。</SPAN></P>]]></description><author>黑总</author><pubDate>2011-5-4 13:45:46</pubDate></item><item><title><![CDATA[在当下，每位普通民众都有可能成为有毒食品的受害者]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005157751.aspx</link><description><![CDATA[<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在当前搞得沸沸扬扬的上海“染色馒头”事件中，生产这种馒头的工人在声称：饿死也不会吃自己生产出来的“染色馒头”。这肯定会让吃了这种馒头的人感到十分的气愤与郁闷，你都不吃，为什么要生产出来害我们！但是，请大家细想一下，会发现在当前的中国，受害的是全部的普通民众，只有那些吃着“特供”食品的“上层”人士或许能免于这些有毒食品的伤害。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">你不吃自己生产的过期馒头，但你会吃上由“瘦肉精”喂养出来的猪肉，生产“瘦肉精”型猪肉的养殖户不吃自己生产出来的猪肉，但你会吃上受到严重污染的大米与蔬菜，将有毒的大米与蔬菜卖给别人的农民一不小心就将三聚氰胺奶粉买来给自己的孩子吃，最终相当一部分孩子成为所谓的“结石”宝宝……，这么多年来，我们普通的老百姓几乎每天都在吃着有毒的食品：“苏丹红”果酱、抛光的陈大米、假药、地沟油、米线中掺杂有让人上瘾的鸦片壳、用屎尿浸润出来的“臭豆腐”、用工业酒精勾兑的假酒、外国人不吃的转基因食品、掺入石膏粉的面粉等等，几乎涵盖了食品的所有领域，你想不“中招”都难，正如现在好多人所说的，我们就像天龙八部中的段公子一样，已经成为“百毒不侵”之身。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">很多时候，我对这种现象在咱们中国泛滥的现象感到不解！我们不是有食品安全监管的机构吗？这些机构是怎么监督的？后来才明白，咱们这些机构的公仆们根本就没有认真的管这方面的事，就像大部分政府部门一样，他们只管收钱罚款。但不知道这些公仆们知不知道，他们任由这些有毒有害食品在社会上流通，他们也会吃上这些有毒的东东！</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在当前的大背景下，我们确实在一步步的变为“虫”。也许若干年后，我们会“进化”为与地球上其他民族“不一样”的种族！</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">事实上，不只是在食品业中，生产食品的工人不吃自己生产出来的产品，这种现象已经渗透到各个行业，比如教育行业，我们天天在吹嘘我们在教育上取得了多大的成就，但只要是有办法，就会想方设法将自己的子女送到国外读书，却不留在国内享受国家的优质教育资源，这其实是看清楚了自己国家的教育水平不行。专家精英们大力鼓吹现在的祖国是形势一片大好，为千年难得的“盛世”，但这些专家精英们私下却将自己的家人全部送到国外去“受苦受难”，这是因为他们看清楚了国内国外的巨大差距……，这样的例子还有很多。这不由得不让人深思：我们的国家到底怎么了？我们的民众的道德素养出了什么问题？我们政府搞清楚了自己的职责与义务了吗？这些东西不理清楚，就谈不上民族的复兴！</SPAN></P>]]></description><author>黑总</author><pubDate>2011-4-16 1:14:50</pubDate></item><item><title><![CDATA[重庆市高2011级二诊试题理科综合物理部分（含答案）]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005157094.aspx</link><description><![CDATA[<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">高</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> 2011 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">级考前模拟测试卷理科综合能力测试</SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（选择题</SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第一部分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> (</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">选择题</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">共</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">126</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">14</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．据报道，重庆市筹建的核电厂选址是涪陵区</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">816</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">核工厂，拟建的核电项目是</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个压水反应堆，利用其产生的核能带动</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">台</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">100</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">万千瓦的机组发电．核电站在发电的同时还可以生产出可供研制核武器的钚</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">239</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><SUB><?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" /><v:shapetype id=_x0000_t75 stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"><FONT face="Times New Roman"> <IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/04/1005031378.gif" width=20 onload=javascript:resizepic(this) height=25><v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:lock aspectratio="t" v:ext="edit"></o:lock></FONT></v:shapetype></SUB><FONT face="Times New Roman">Pu)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，这种钚</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">239</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">可以由铀</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">239</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/04/1005031379.gif" width=20 onload=javascript:resizepic(this) height=25></SPAN><SPAN lang=EN-US><SUB></SUB><FONT face="Times New Roman">U</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）经过</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">n</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">次</SPAN><SPAN style="FONT-FAMILY: 宋体">β</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">衰变而产生，则</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;</SPAN>A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">n</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">n</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:chmetcnv w:st="on" UnitName="C" SourceValue="239" HasSpace="True" Negative="False" NumberType="1" TCSC="0"><st1:chmetcnv w:st="on" UnitName="C" SourceValue="239" HasSpace="False" Negative="False" NumberType="1" TCSC="0">239 </st1:chmetcnv><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>C</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">n</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">145<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;</SPAN>D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">n</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">92</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">15</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．题</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">15</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图为两分子系统的势能</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">E<SUB>P</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与两分子间距离</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的关系曲线，下列说法正确的是</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．当</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">大于</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r<SUB>1</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，分子间的作用力表现为引力</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．当</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">等于</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r<SUB>l</SUB> </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，分子间的作用力为零</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．当</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">小于</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r<SUB>l</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，分子间的作用力表现为斥力</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．当</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">由</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r<SUB>1</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">变到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的过程中，分子间的作用力做负功</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/04/1005031380.jpg" width=161 onload=javascript:resizepic(this) height=150></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">16</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．据统计，过去重庆市所发生的交通事故中有</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">20</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">％是由于司机酒后驾驶造成，最近重庆交巡警严查酒后驾驶，掀起新一轮整治酒后驾驶行为风暴．酒精测试仪用于对机动车驾驶人员是否酗酒的现场检测，酒精检测仪是一种半导体酒精气体传感器检测仪．如果传感器的电阻</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与酒精气体浓度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">关系为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">·</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C = k ( k</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为一常数），则在如题</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">16</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图所示的电路中，酒精气体浓度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与电压表示数</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">U</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">之间的对应关系正确的是</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">U</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">越大，表示</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">越大，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">U</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不成正比</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">U</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">越大，表示</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">越大，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">U</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">成正比</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">U</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">越大，表示</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">越小，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">U</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不成反比</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">U</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">越大，表示</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">越小，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">U</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">成反比</SPAN></P><SPAN lang=EN-US>
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<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">17</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．题</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">17</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图中</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S<SUB>1</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是弦线两端的两个波源，它们的振动周期都为</SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>T</SPAN><SPAN style="FONT-FAMILY: 宋体">，</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">振幅都为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">a</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，某时刻</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S<SUB>1</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">发出的波恰好传到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">发出的波恰好传到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，图中只画出了此时刻两列波在</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">AC</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">部分的叠加波形，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S<st1:chmetcnv w:st="on" UnitName="a" SourceValue="1" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SUB>1</SUB>A</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">间</SPAN><SPAN style="FONT-FAMILY: 宋体">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S<st1:chmetcnv w:st="on" UnitName="C" SourceValue="2" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SUB>2</SUB>C</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">间波形没有画出，下列说法正确的是</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体">、<SPAN lang=EN-US>B</SPAN>、<SPAN lang=EN-US>C</SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">三点是振动加强点</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是振动减弱点，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是振动加强点，振幅为</SPAN><st1:chmetcnv w:st="on" UnitName="a" SourceValue="2" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US><FONT face="Times New Roman">2a</FONT></SPAN></st1:chmetcnv></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．再经过</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">T/4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">AC</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">间的波形是一条直线</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．再经过</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">T/4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">AC</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">间的波形不是一条直线</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P><SPAN lang=EN-US>
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<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">18</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．“嫦娥二号”于</SPAN><st1:chsdate w:st="on" Year="2010" Month="10" Day="1" IsLunarDate="False" IsROCDate="False"><SPAN lang=EN-US><FONT face="Times New Roman">2010</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">年</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">10</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">月</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">日</SPAN></st1:chsdate><SPAN lang=EN-US><FONT face="Times New Roman">18</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">59</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">57</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">秒发射升空，并获得了圆满成功．“嫦娥二号”主要任务是获得更清晰、更详细的月球表面影像数据和月球极区表面数据．设定地球到月球的距离为地球同步卫星的轨道半径的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">n</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">倍，根据你知道的常识，估计这个</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">n</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">最接近以下哪个数值</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">6<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><st1:chmetcnv w:st="on" UnitName="C" SourceValue="9" HasSpace="True" Negative="False" NumberType="1" TCSC="0"><FONT face="Times New Roman"><st1:chmetcnv w:st="on" UnitName="C" SourceValue="9" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>9 </SPAN></st1:chmetcnv><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>C</SPAN></FONT></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">28<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">80</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">19</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．题</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">19</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图所示为理想变压器电路，原、副线圈匝数比</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">n<SUB>l </SUB>/ n<SUB>2 </SUB>= 10 / 1 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，副线圈右侧连接有</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个理想二极管，下列说法中正确的是</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．当</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">AB</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端输入电压为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> u = 3llsin10</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体">π</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">tV</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CD</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端输出电压的频率是</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">5Hz </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．当</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">AB</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端输入电压为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> u = 3llsin10</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体">π</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CD</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端输出电压的有效值为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">22V </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．当</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">AB</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端输入交流电时，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CD</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端输出的也是交流电</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．当</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">AB</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端输入恒定直流电时，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CD</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端输出的也是直流电</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/04/1005031384.jpg" width=194 onload=javascript:resizepic(this) height=130></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">20</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．题</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">20</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图所示为竖直面内的光滑半圆弧轨道，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为圆心，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是位于同一水平线的圆弧上的两点，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为圆弧最低点，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">AC</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">间有一光滑直杆，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">OA</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与竖直方向的夹角为</SPAN><SPAN style="FONT-FAMILY: 宋体">θ</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．现有可视为质点的两个甲乙小球分别套在</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">AC</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">直杆、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">BC</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">圆弧上（图中未画出），另一可视为质点的小球丙处于</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点．现让甲、乙、丙三小球分别从</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>B</SPAN><SPAN style="FONT-FAMILY: 宋体">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点无初速释放，到达</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处所经过的时间分别为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t<SUB>l</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t<SUB>3</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，不计空气阻力，不考虑三小球的碰撞，则关于时间</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t<SUB>l</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t<SUB>3</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的大小关系，下列说法正确的是</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t<SUB>l</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＜</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t<SUB>3</SUB></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t<SUB>l</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＞</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t<SUB>2</SUB></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t<SUB>l</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＜</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t<SUB>2</SUB></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．因为</SPAN><SPAN style="FONT-FAMILY: 宋体">θ</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">数值不明确，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t<SUB>l</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">大小关系不能确定</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/04/1005031385.jpg" width=138 onload=javascript:resizepic(this) height=103></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">21</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．题</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">21</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图所示，有一光滑钢球质量为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，被一</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">U</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">形框扣在里面，框的质量为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，它们搁置于光滑水平面上，现让小球以速度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">v<SUB>0</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">向右去第一次撞击静止的框，设碰撞无机械能损失，经多次相互撞击，下面结论正确的是</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．二者最终将以相同的速度向右运动</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．只有</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M=<st1:chmetcnv w:st="on" UnitName="m" SourceValue="2" HasSpace="False" Negative="False" NumberType="1" TCSC="0">2m</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，在它们发生偶数次碰撞后，小球的速度才会再次等于</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">v<SUB>0</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，框也重现静止状态</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．当</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M=<st1:chmetcnv w:st="on" UnitName="m" SourceValue="3" HasSpace="False" Negative="False" NumberType="1" TCSC="0">3m</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，在它们发生第三次碰撞后，小球的速度将会再次等于</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">v<SUB>0</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，框也会再次重现静止状态</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．在它们发生偶数次碰撞后，小球的速度就会再次等于</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">v0</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，框也重现静止状态，与</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">数值大小关系无关</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/04/1005031386.jpg" width=222 onload=javascript:resizepic(this) height=83></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第二部分（非选择题共</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> 174 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">22 . ( 19</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> ( 1 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）利用软木塞插针法测水的折射率实验步骤：</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">①</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如题</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">22 ( a </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）图，取一厚度可忽略不计的圆形软木塞，在它的圆心处插上一枚大头针，让软木塞浮在水面上．</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">②</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">调整大头针插入软木塞的深度，使得从软木塞周围向液体中观察，恰好看不到大头针，这是由于</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">____________________________________________ . </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">③</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">需要测量的物理量</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>A_________________________</SPAN><SPAN style="FONT-FAMILY: 宋体">，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B___________________ </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（写出物理量符号和相应的物理意义）</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">④</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">水的折射率表达式</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> n =_____________________________</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．（用物理量符号表示）</SPAN></P><SPAN lang=EN-US>
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<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 2 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）某同学欲将满偏电流</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">I<SUB>g</SUB>=100</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体">μ</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">内阻未知的电流表改装成量程较大的毫安表，并对改装表进行校对</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">.</FONT></SPAN></P><SPAN lang=EN-US>
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<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">①</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">该同学利用题</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> 22 ( b </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）图所示的电路测量电流表的内阻（图中电源的电动势</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">E=6V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）时，先闭合开关</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，调节电位器</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，使电流表指针偏转到满刻度；再闭合开关</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S</FONT></SPAN><SUB><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>2</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体">，</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">保持</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不变，调节电阻箱</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R ', </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">使电流表指针偏转到满刻度的一半；接着读出此时</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R '</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的阻值为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">198</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体">Ω</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．则该同学测出的电流表的内阻为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R<SUB>g</SUB>=__________</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体">Ω</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">②</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">若要将该电流表改装成量程为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">10mA</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的电流表，需给它</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">________</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（填“串联”或“并联”）一个阻值为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R<SUB>0</SUB>=_______</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体">Ω</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的电阻．</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">③</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">把改装好的电流表与标准电流表串联在电路中进行校对．由于利用</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">①</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对电流表内阻测定存在系统误差，若改装好的电流表的测量值为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">I<SUB>1</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，标准电流表的测量值为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">I<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">I<SUB>1</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">I<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">数值关系为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">I<SUB>1</SUB>________I<SUB>2</SUB>. </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（选填“</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> &gt; </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">”、“</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> = </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">”或“</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> &lt; " ) </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">④</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为了完全消除对电流表内阻测定的系统误差，该同学与邻组同学合作，又找来了一只完全一样的电流表，则只需在原“半偏法”的电路上稍作改进即可，请你在方框内画出改进后的测电流表的内阻电路图．</SPAN></P><SPAN lang=EN-US>
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<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">23</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">( 16 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）如题</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">23</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图所示，间距为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、电阻不计的两根平行金属导轨</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>N</SPAN><SPAN style="FONT-FAMILY: 宋体">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">PQ </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（足够长）被固定在同一水平面内，从</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">P</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">间连接了一电阻</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，长度为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、质量为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、电阻也为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的导体棒</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">ab</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">垂直置于导轨上，一根轻绳绕过定滑轮后沿两金属导轨的中线与</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">ab</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">棒连接，其下端悬挂一个质量也为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的物体</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，整个装置处于方向竖直向上、磁感应强度大小为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的匀强磁场中．开始时使导体棒</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">ab</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和物体</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">都处于静止状态且轻绳拉直，现释放</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，经过时间</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，物体</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">下降的高度为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">h</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，速度为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">v</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．不计一切摩擦，导体棒始终与导轨接触良好，重力加速度为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">g</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．求此时刻：</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( l ) a </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">b</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">两端间的电压；</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> ( 2 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）物体</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的加速度大小．</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/04/1005031390.jpg" width=260 onload=javascript:resizepic(this) height=132></P>
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<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">24</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">( 18 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如题</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">24</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图所示，在竖直平面直角坐标</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">xOy</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">内有半径为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、圆心在</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点、与</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">xOy</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">平面垂直的圆形匀强磁场，右侧有水平放置的两块带电金属板</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>N</SPAN><SPAN style="FONT-FAMILY: 宋体">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">PQ</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">平行正对，极板长度为</SPAN><FONT face="Times New Roman"><I style="mso-bidi-font-style: normal"><SPAN lang=EN-US>l</SPAN></I><SPAN lang=EN-US> </SPAN></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，板间距为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> d </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，板间存在着方向竖直的匀强电场．一质量为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">且电荷量为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">q</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的粒子（不计重力及空气阻力）以速度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">v<SUB>0</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">从</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处沿</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">y</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">轴正向进入圆形匀强磁场，并沿</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">x</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">轴正向离开圆形匀强磁场，然后从两极板的左端沿中轴线</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CD</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">射入匀强电场，恰好打在上板边沿</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> .</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">求，</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( l </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）匀强磁场的磁感应强度大小</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 2 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）两极板间匀强电场的场强大小</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">E</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 3 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）若该粒子以与</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">y</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">轴正向成</SPAN><SPAN style="FONT-FAMILY: 宋体">θ</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> = 3</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>0</SPAN><SPAN style="FONT-FAMILY: 宋体">°</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">从</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处进入圆形匀强磁场，如图所示，且</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> d =4R/</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>3</SPAN><SPAN style="FONT-FAMILY: 宋体">，试确定该粒子打在极板上距</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体">端的距离．（用</SPAN><I style="mso-bidi-font-style: normal"><SPAN lang=EN-US><FONT face="Times New Roman">l</FONT></SPAN></I><SPAN style="FONT-FAMILY: 宋体">表示）<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/04/1005031391.gif" width=371 onload=javascript:resizepic(this) height=183></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">25</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">( 19 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）一传送带装置示意如题</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">25</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图所示，其中传送带</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">AB</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">区域是水平的，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">BC</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">区域的倾角</SPAN><SPAN style="FONT-FAMILY: 宋体">θ</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">= 3</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>7</SPAN><SPAN style="FONT-FAMILY: 宋体">°</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处有一很小段圆弧形过渡（圆弧形长度不计，图中未画出），</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">AB</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">长度为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> L<SUB>l</SUB> = <st1:chmetcnv w:st="on" UnitName="m" SourceValue="4" HasSpace="False" Negative="False" NumberType="1" TCSC="0">4m</st1:chmetcnv> </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">BC</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">长度为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><FONT face="Times New Roman"><st1:chmetcnv w:st="on" UnitName="m" SourceValue="16.6" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>16.6m</SPAN></st1:chmetcnv><SPAN lang=EN-US> </SPAN></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．现将一个质量</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m = l.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>0</SPAN><SPAN style="FONT-FAMILY: 宋体">㎏</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的工件（可视为质点）无初速轻放在传送带</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端，工件与传送带间动摩擦因素为</SPAN><SPAN style="FONT-FAMILY: 宋体">μ</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">= 0.8</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．设传送带运行的速率</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">v = <st1:chmetcnv w:st="on" UnitName="m" SourceValue="8.4" HasSpace="False" Negative="False" NumberType="1" TCSC="0">8.4m</st1:chmetcnv>/s </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">始终保持不变，取</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">g = l<st1:chmetcnv w:st="on" UnitName="m" SourceValue="0" HasSpace="False" Negative="False" NumberType="1" TCSC="0">0m</st1:chmetcnv>/s<SUP>2</SUP> , sin3</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>7</SPAN><SPAN style="FONT-FAMILY: 宋体">°<SPAN lang=EN-US>= 0.6</SPAN>，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">cos3</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>7</SPAN><SPAN style="FONT-FAMILY: 宋体">°</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">= 0.8</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．求：</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( l </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）工件到达</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端时的速度大小；</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 2 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）工件从</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端运动到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端所经历的时间；</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 3 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）工件从</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端传送到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端的过程中，工件与传送带间克服摩擦总共生热多少？（传送带与轮子间无相对滑动，不计轮轴处的摩擦）</SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/04/1005031392.jpg" width=267 onload=javascript:resizepic(this) height=152></FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p></o:p></SPAN>&nbsp;</P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><o:p><FONT face="Times New Roman">参考答案</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><o:p><IMG style="WIDTH: 641px; HEIGHT: 805px" onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/04/1005031687.jpg" width=400 onload=javascript:resizepic(this) height=500></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG style="WIDTH: 655px; HEIGHT: 861px" onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/04/1005031688.jpg" width=425 onload=javascript:resizepic(this) height=500></FONT></o:p></SPAN></P>]]></description><author>黑总</author><pubDate>2011-4-15 18:42:59</pubDate></item><item><title><![CDATA[蛆]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005119774.aspx</link><description><![CDATA[<DIV class=content>
<P><FONT style="FONT-SIZE: 22px">不完全变态</FONT></P>
<P><FONT style="FONT-SIZE: 22px">蛆一直生活在粪坑里，就以为全世界的生物都生活在粪坑里；后来努力长出了智慧的双翅，飞出去浏览了一圈，才发现外面的世界是多么的美好，绝大多数的生物都不是生活在粪坑里</FONT></P>
<P>这是老同学老庄的一篇博文，看了之后，很受启发。从不同的角度来看，会得出不同的结论。</P>
<P>在蛆看来，生活在粪坑里面是自己最大的幸福，当蛆变成苍蝇到外面的世界去逛了一圈之后，肯定会觉得还是粪坑里面才是这个世界上最“宜居”之地，就像现在的房地产广告中据说的那样。</P>
<P>而在人看来，却会认为粪坑是极为肮脏之地，想不明白蛆们的想法。</P>
<P>很多时候，觉得人世间的蛆确实太多，多得数都数不过来。不过，我还是十分的尊重蛆的选择与看法。因为，在蛆看来，我们所说的鸟语花香的环境实际上并不适于他们生活。不同的物种有不同的生活环境，这是我们这个世界之所以丰富多彩的原因。</P></DIV>]]></description><author>黑总</author><pubDate>2011-4-1 22:56:28</pubDate></item><item><title><![CDATA[重庆市高2011级学生学业调研抽测试卷（第一次）七区联考理综物理（含答案）]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005051733.aspx</link><description><![CDATA[<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">高</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2011</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">级学生学业调研抽测试卷（第一次）</SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">理</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">科</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">综</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">合</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp; </FONT></SPAN></SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第一部分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">选择题，共</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">126</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; COLOR: white; FONT-SIZE: 5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">高考</SPAN><SPAN style="COLOR: white; FONT-SIZE: 5pt" lang=EN-US><FONT face="Times New Roman">#</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; COLOR: white; FONT-SIZE: 5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">资</SPAN><SPAN style="COLOR: white; FONT-SIZE: 5pt" lang=EN-US><FONT face="Times New Roman">@</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; COLOR: white; FONT-SIZE: 5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">源网</SPAN><SPAN style="COLOR: white; FONT-SIZE: 5pt" lang=EN-US><FONT face="Times New Roman">yjw</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">本题包括</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">21</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">小题。每小题</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">6</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分，每小题只有一个选项符合题意</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">14.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">某商场一顾客站在自动扶梯上匀速上升，如图所示，关于该顾客在上升过程中受力分析正确的是</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp; </FONT></SPAN></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">顾客在水平方向受到向右的摩擦力</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">顾客所受的合力方向与图中</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">v</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的方向相同</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">顾客只在竖直方向受到力的作用且合力为零</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">顾客在竖直方向受到的合力不为零，但在</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">v</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的方向上合力为零</SPAN></P><SPAN lang=EN-US><?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" /><v:shapetype id=_x0000_t75 stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"><v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:lock aspectratio="t" v:ext="edit"></o:lock></v:shapetype>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027511.gif" width=163 onload=javascript:resizepic(this) height=137></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">15.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">下面的表格是某地区</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1~6</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">月份气温与气压的对照表：</SPAN></P>
<DIV align=center>
<TABLE style="BORDER-COLLAPSE: collapse; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt; mso-yfti-tbllook: 480" border=0 cellSpacing=0 cellPadding=0>
<TBODY>
<TR style="mso-yfti-irow: 0; mso-yfti-firstrow: yes">
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 94.7pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=126>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">月份</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">/</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">月</SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.3pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">1</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.35pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">2</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.35pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">3</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.35pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">4</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.35pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">5</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.35pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">6</FONT></SPAN></P></TD></TR>
<TR style="mso-yfti-irow: 1">
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 94.7pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=126>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">平均最高气温</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">/℃</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.3pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">1.8</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.35pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">4.5</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.35pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">12.8</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.35pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">21.4</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.35pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">28.7</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.35pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">31.4</FONT></SPAN></P></TD></TR>
<TR style="mso-yfti-irow: 2; mso-yfti-lastrow: yes">
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 94.7pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=126>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">平均大气压</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">/105Pa</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.3pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">1.031</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.35pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">1.025</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.35pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">1.018</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.35pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">1.012</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.35pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">1.007</FONT></SPAN></P></TD>
<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; PADDING-BOTTOM: 0cm; BACKGROUND-COLOR: transparent; PADDING-LEFT: 5.4pt; WIDTH: 47.35pt; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8; PADDING-TOP: 0cm" vAlign=top width=63>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">0.9764</FONT></SPAN></P></TD></TR></TBODY></TABLE></DIV>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">6</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">月份与</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">月份相比较，下列说法正确的是</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp; </FONT></SPAN></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">空气中每个气体分子无规则热运动的速度加快了</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">空气分子无规则热运动减弱了</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">单位时间内空气分子对地面单位面积的撞击次数增多了</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">单位时间内空气分子对地面单位面积的撞击次数减少了</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">16.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如图所示，是某课外研究小组设计的可以用来测量转盘转速的装置。该装置上方是一与转盘固定在一起有横向均匀刻度的标尺，带孔的小球穿在光滑细杆上与一轻弹簧相连，弹簧的另一端固定在转轴上，小球可沿杆自由滑动并随转盘在水平面内转动。当转盘不转动时，指针指在</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处，如果转盘转动的角速度为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">ω<SUB>1</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，指针指在</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处，当转盘转动的角速度为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">ω<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，指针指在</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处，设弹簧均没有超过弹性限度。则</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">ω<SUB>1</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">ω<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的比值为</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp; </FONT></SPAN></SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027513.gif" width=216 onload=javascript:resizepic(this) height=130></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A.1/2<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;</SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;</SPAN><SPAN style="mso-tab-count: 2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　</SPAN><SPAN lang=EN-US><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027512.gif" width=29 onload=javascript:resizepic(this) height=46><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN style="mso-spacerun: yes">&nbsp;</SPAN><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp; </SPAN>C. 1/4<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-tab-count: 2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>D.<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027514.gif" width=27 onload=javascript:resizepic(this) height=44></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">17.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如图是某绳波形成过程的示意图，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">3</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">4……</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为绳上的一系列等间距的质点，绳处于水平方向。质点</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在外力作用下沿竖直方向做简谐运动，带动</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">3</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">4……</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">各个质点依次上下振动，把振动从绳的左端传到右端。</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t = 0</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时质点</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开始竖直向上运动，质点振动周期为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">T</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。经过四分之一周期，质点</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">5</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开始运动，此时质点</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">已发生的位移为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。下列判断正确的是</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp; </FONT></SPAN></SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027516.gif" width=458 onload=javascript:resizepic(this) height=73></P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A. t=T/4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时质点</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">5</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的运动方向向下</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-tab-count: 2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B. t=T/2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时质点</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">7</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的加速度方向向上</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C. t=3T/4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时质点</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">5</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">运动的路程为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">3s<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-tab-count: 2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>D. t=T</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时质点</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">9</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">向下运动</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">18.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如图所示，绝缘斜面处在沿水平向右的匀强电场中，斜面上的带电金属块沿斜面滑下，已知在金属块滑下的过程中动能增加了</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">12J</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，金属块克服摩擦力做功</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">8.0J</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，重力做功</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">24J</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，则以下判断正确的是</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp; </FONT></SPAN></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电场力对金属块做正功</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">4.0J </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">金属块的机械能增加</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">36J </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">金属块的电势能增加</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">4.0J</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">金属块带负电荷</SPAN></P><SPAN lang=EN-US>
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<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027515.gif" width=147 onload=javascript:resizepic(this) height=141></P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><v:shape style="Z-INDEX: 9; POSITION: absolute; TEXT-ALIGN: left; MARGIN-TOP: 108.8pt; WIDTH: 29.2pt; HEIGHT: 10.5pt; MARGIN-LEFT: 273.8pt; LEFT: 0px" id=_x0000_s1255 stroked="f" alt="高考资源网( www.ks5u.com)，中国最大的高考网站，您身边的高考专家yjw。" type="#_x0000_t202"><v:textbox style="mso-next-textbox: #_x0000_s1255"><FONT face="Times New Roman"></FONT></v:textbox></v:shape><SPAN style="Z-INDEX: 9; POSITION: absolute; LEFT: 0pt; mso-ignore: vglayout">
<TABLE cellSpacing=0 cellPadding=0 width="100%">
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<TD style="BORDER-BOTTOM: #ece9d8; BORDER-LEFT: #ece9d8; BACKGROUND-COLOR: transparent; BORDER-TOP: #ece9d8; BORDER-RIGHT: #ece9d8">
<DIV style="PADDING-BOTTOM: 3.6pt; PADDING-LEFT: 7.2pt; PADDING-RIGHT: 7.2pt; PADDING-TOP: 3.6pt" class=shape v:shape="_x0000_s1255">
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P></DIV></TD></TR></TBODY></TABLE></SPAN><SPAN lang=EN-US><FONT face="Times New Roman">19.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电荷量为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">q=1×10<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:chmetcnv w:st="on" UnitName="C" SourceValue="4" HasSpace="False" Negative="True" NumberType="1" TCSC="0">-4C</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">带正电小物块置于绝缘水平面上，所在空间存在沿水平方向且方向始终不变的电场，电场强度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">E</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的大小与时间</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的关系和物块速度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">v</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与时间</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的关系如图所示。若重力加速度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">g</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">取</SPAN><FONT face="Times New Roman"><st1:chmetcnv w:st="on" UnitName="m" SourceValue="10" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>10m</SPAN></st1:chmetcnv><SPAN lang=EN-US>/s2</SPAN></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，则物块的质量</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和物块与地面之间的动摩擦因素</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">μ</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分别是</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp; </FONT></SPAN></SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027518.gif" width=362 onload=javascript:resizepic(this) height=173></SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A. m=</FONT><st1:chmetcnv w:st="on" UnitName="kg" SourceValue="1" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><FONT face="Times New Roman">1k</FONT><SPAN style="FONT-FAMILY: 宋体">g</SPAN></st1:chmetcnv></SPAN><SPAN style="FONT-FAMILY: 宋体">，μ<SPAN lang=EN-US>=0.2</SPAN></SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-tab-count: 2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-tab-count: 3">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B. m = <st1:chmetcnv w:st="on" UnitName="kg" SourceValue="1.5" HasSpace="False" Negative="False" NumberType="1" TCSC="0">1.5kg</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><FONT face="Times New Roman"> <SPAN lang=EN-US>μ = 0.13</SPAN></FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C. m=</FONT><st1:chmetcnv w:st="on" UnitName="kg" SourceValue=".5" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><FONT face="Times New Roman">0.5k</FONT><SPAN style="FONT-FAMILY: 宋体">g</SPAN></st1:chmetcnv></SPAN><SPAN style="FONT-FAMILY: 宋体">，μ<SPAN lang=EN-US>=0.2</SPAN></SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN style="mso-tab-count: 2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>D. m=</FONT><st1:chmetcnv w:st="on" UnitName="kg" SourceValue=".5" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><FONT face="Times New Roman">0.5k</FONT><SPAN style="FONT-FAMILY: 宋体">g</SPAN></st1:chmetcnv></SPAN><SPAN style="FONT-FAMILY: 宋体">，μ<SPAN lang=EN-US>=0.4</SPAN></SPAN><SPAN lang=EN-US><SPAN style="mso-tab-count: 1"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp; </FONT></SPAN></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">20.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">有两根长直导线</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">a</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">b</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">互相平行放置，图所示为垂直于导线的截面图。在图示的平面内，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点为两根导线连线</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">ab</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的中点，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">ab</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的中垂线上的两点，它们与</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">ab</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的距离相等。若两导线中通有大小相等、方向相同的恒定电流，已知直线电流产生的磁场在某点的磁感应强度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的大小跟该点到通电导线的距离</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">成反比。则关于线段</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">上各点的磁感应强度的说法中正确的是</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp; </FONT></SPAN></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A. M</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点和</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点的磁感应强度大小相等，方向相同</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B. M</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点和</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点的磁感应强度大小相等，方向相反</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在线段</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">上各点的磁感应强度都不可能为零</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">若在</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点放一小磁针</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">,</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">静止时其北极沿</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">ON</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">指向</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027520.gif" width=135 onload=javascript:resizepic(this) height=154></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">21.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">宇航员在地球和某星球表面做了两个对比实验。实验一：在该星球和地球上以同样的高度和初速度平抛同一物体，发现其水平射程是地球上的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">倍。实验二：飞船绕该星球表面的运行周期是它绕地球表面运行周期的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">倍。则该星球与地球的质量之比和半径之比分别是</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp; </FONT></SPAN></SPAN></P><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A. 1/256 , 1/4<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-tab-count: 1">&nbsp;&nbsp; </SPAN>B. 1/256 , 1/<st1:chmetcnv w:st="on" UnitName="C" SourceValue="8" HasSpace="False" Negative="False" NumberType="1" TCSC="0">8 </st1:chmetcnv><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN style="mso-tab-count: 1">&nbsp;&nbsp; </SPAN>C. 1/64</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1/4<SPAN style="mso-tab-count: 1">&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-tab-count: 1">&nbsp; </SPAN>D. 1/16</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1/1</FONT></SPAN></P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第二部分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">非选择题，共</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">174</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">22.(19</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)(1)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">某实验小组在做</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">“</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">验证机械能守恒定律</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">”</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">实验时，有如下操作步骤：</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在铁架台上水平固定好打点计时器，将连有重物的纸带竖直穿过限位孔用手提住，让手尽量靠近打点计时器；</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">松开纸带，赶紧接通电源，开始打点，随后从重物上取下纸带；</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">挑选点迹清晰的纸带，在纸带上选取相隔较远的两个点</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">a</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">b</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">作为验证的两个状态，测出这两个点之间的距离就是这两个状态之间重物下落的高度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">h</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">；</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">以</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">a</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">作为连续三个测量点的中间点，测算出该三点中首尾两点之间的平均速度就是</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">a</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点的瞬时速度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">va</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，用同样的方法，测出</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">b</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点的瞬时速度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">vb</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">；</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">E.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">计算上述两个状态之间重物动能的增加量<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027529.gif" width=92 onload=javascript:resizepic(this) height=39></SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，计算重物重力势能的减少量</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">mgh</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，比较它们的大小是否相等。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">该实验小组在上述实验步骤中有两个错误的操作，其错误的步骤和错误是：</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">①<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">；</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">②<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(2)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">下面是该小组按正确操作时的情况记录：已知打点计时器所用电源的频率为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">50Hz</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，重力加速度近似取</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">g=<st1:chmetcnv w:st="on" UnitName="m" SourceValue="10" HasSpace="False" Negative="False" NumberType="1" TCSC="0">10.00m</st1:chmetcnv>/s2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，从实验获得的纸带中选取一条点迹清楚且符合要求的纸带</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如图</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，若把第一点记作</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，另选择连续的三个点</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">作为测量的点，经测量</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点的距离分别为</SPAN><st1:chmetcnv w:st="on" UnitName="cm" SourceValue="70.18" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US><FONT face="Times New Roman">70.18cm</FONT></SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><st1:chmetcnv w:st="on" UnitName="cm" SourceValue="77" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US><FONT face="Times New Roman">77.00cm</FONT></SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><st1:chmetcnv w:st="on" UnitName="cm" SourceValue="85.18" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US><FONT face="Times New Roman">85.18cm</FONT></SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。若重物质量为</SPAN><st1:chmetcnv w:st="on" UnitName="kg" SourceValue="1" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US><FONT face="Times New Roman">1kg</FONT></SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，由此可知重物在纸带打击</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点到打击</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点的运动过程中，重力势能的减小量为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>J</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">；动能的增加量是</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>J</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。除了考虑</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">g</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的取值带来的影响以外，你认为导致实验误差的主要原因是</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;</SPAN></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><v:shape style="Z-INDEX: 8; POSITION: absolute; TEXT-ALIGN: left; MARGIN-TOP: 45pt; WIDTH: 1in; HEIGHT: 23.4pt; MARGIN-LEFT: 183.6pt; LEFT: 0px" id=_x0000_s1254 stroked="f" alt="高考资源网( www.ks5u.com)，中国最大的高考网站，您身边的高考专家yjw。" type="#_x0000_t202"><v:textbox style="mso-next-textbox: #_x0000_s1254"></v:textbox></v:shape><SPAN lang=EN-US><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027526.jpg" width=439 onload=javascript:resizepic(this) height=57></SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(3)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">某同学在做《自来水电阻率的测定》课题时，在一根均匀的长玻璃管两端各装了一个电极，其间充满待测的自来水，然后用如图甲所示电路进行测量。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027527.gif" width=500 onload=javascript:resizepic(this) height=241></FONT></SPAN></SPAN><SPAN lang=EN-US></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US>&nbsp;</P></SPAN><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027528.gif" width=281 onload=javascript:resizepic(this) height=181></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">该同学选用器材如下：</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电压表</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">量程</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">15V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，内阻约</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">90kΩ)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、电流表</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">量程</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">300μA</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，内阻约</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">50Ω)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、滑动变阻器</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(100Ω</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><FONT face="Times New Roman"><st1:chmetcnv w:st="on" UnitName="a" SourceValue="1" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>1A</SPAN></st1:chmetcnv><SPAN lang=EN-US>)</SPAN></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、电池组</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电动势</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">E=12V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，内阻</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r=6Ω)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、开关一个、导线若干。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">实验中测量情况如下：</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">安装前他用图乙</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(a)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的游标卡尺测玻璃管的内径，结果如图乙</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(b)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">测得两电极相距</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L=0.314m.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">实验中测得包括</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">0</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在内的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">9</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组电流</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">I</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、电压</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">U</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的值，在坐标纸上描点如图丙。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">根据以上材料回答下面的问题：</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">①</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">测量玻璃管内径时，应将图乙</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(a)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">游标卡尺中的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">三部分中的</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </FONT></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与玻璃管内壁接触；玻璃管的内径</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">d=<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>mm</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">②</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">根据实验数据可知该同学测得水柱的电阻</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R=______Ω(</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">保留两位有效数字</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">；请用水柱电阻</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、玻璃管内径</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">d</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、水柱长度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">表示自来水的电阻率</SPAN><SPAN style="FONT-FAMILY: 宋体">ρ</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">=<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">③</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">根据测得水柱电阻值可知实验中电路设计的不妥之处是</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </FONT></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，请在答卷的虚线框中画出改进后的电路图。</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电路图中用</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R<SUB>x</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">表示自来水的电阻</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">23.(16</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)2008</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">年四川发生</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">“<st1:chmetcnv w:st="on" UnitName="”" SourceValue="5.12" HasSpace="False" Negative="False" NumberType="1" TCSC="0">5.12”</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">汶川大地震。某商场一栋高</SPAN><st1:chmetcnv w:st="on" UnitName="m" SourceValue="45" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US><FONT face="Times New Roman">45.0m</FONT></SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的楼房发生轰然倒塌，灰尘和残渣四处飞扬，商场的人们几乎没能逃生。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我们不妨设置当时的情境：当处于倒塌部分正下方的地面人员，看到一块质量约为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">4.0×10<SUP>3</SUP>kg</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的墙块从楼房顶端竖直掉落时到作出反应开始逃离需</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">0.2s</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的时间，安全区域离建筑物</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">30.0m</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">以外</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">实际的安全区要更远</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。设该坠落墙块与地面作用时间为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">0.5s</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，不计空气阻力，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">g</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">取</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">10.0m/s<SUP>2</SUP></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。求：</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(1)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">该地面人员从发现墙块掉落至逃到安全区至少要以多大速度奔跑？</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">忽略人的加速时间，百米短跑世界记录为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">9″79)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(2)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">由于震源产生纵波和横波引起地表不同震感，设产生的纵波的传播速率</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">v<SUB>p</SUB> = <st1:chmetcnv w:st="on" UnitName="km" SourceValue="9.3" HasSpace="False" Negative="False" NumberType="1" TCSC="0">9.3km</st1:chmetcnv>/s</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，横波的传播速率</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">v<SUB>s</SUB> = <st1:chmetcnv w:st="on" UnitName="km" SourceValue="3.1" HasSpace="False" Negative="False" NumberType="1" TCSC="0">3.1km</st1:chmetcnv>/s</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，设在某处的地震观测中心记录到两种不同震感之间的时间间隔</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">△t<SUB>0</SUB> = 5.0s</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，那么观测中心与震源之间的距离</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">s</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为多少千米？</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(3)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">该坠落块对地产生的平均作用力多大？</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp; </FONT></SPAN></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN>24.(18</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">某同学设计了一种测定风力、风速的装置，其原理如图所示，迎风板与一轻弹簧的一端</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相接，一起穿在光滑的金属杆上。弹簧是绝缘材料制成的，其劲度系数</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">k</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1300N/m</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，自然长度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L<SUB>0</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><st1:chmetcnv w:st="on" UnitName="m" SourceValue=".5" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US><FONT face="Times New Roman">0.5m</FONT></SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，均匀金属杆用电阻率较大的合金制成，迎风板面积为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><st1:chmetcnv w:st="on" UnitName="m2" SourceValue=".5" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US><FONT face="Times New Roman">0.5m<SUP>2</SUP></FONT></SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，工作时总是正对着风吹来的方向。电路中左端导线与金属杆</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端固定相连，右端导线接在</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点并可随迎风板在金属杆上滑动，且与金属杆接触良好。限流电阻的阻值</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1.0Ω</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，电源电动势</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">E</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">12.0V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，内阻</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">0.5Ω</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。合上开关，没有风吹时，弹簧处于原长，理想电压表的示数</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">U<SUB>1</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">3.0V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。求：</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(1)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">无风时金属杆接入电路的电阻</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R<SUB>1</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和单位长度的电阻值；</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(2)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如果某时刻由于风吹使迎风板向左压缩弹簧，电压表的示数变为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">U<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2.0V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，此时作用在迎风板上的风力；</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(3)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">若风</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">运动的空气</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与迎风板作用后速度变为零，已知</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(2)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">问中装置所在处空气的密度为</SPAN><FONT face="Times New Roman"><st1:chmetcnv w:st="on" UnitName="kg" SourceValue="1.3" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>1.3kg</SPAN></st1:chmetcnv><SPAN lang=EN-US>/m<SUP>3</SUP></SPAN></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，求此时此处风速为多大？</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027530.gif" width=177 onload=javascript:resizepic(this) height=115></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">25.(19</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如图所示，质量</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M=<st1:chmetcnv w:st="on" UnitName="kg" SourceValue="4" HasSpace="False" Negative="False" NumberType="1" TCSC="0">4.0kg</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的滑板</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">静止于光滑的水平面上。滑板右端固定着一根轻质弹簧，弹簧的自由端</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">到滑板左端的距离</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L=<st1:chmetcnv w:st="on" UnitName="m" SourceValue=".5" HasSpace="False" Negative="False" NumberType="1" TCSC="0">0.5m</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，在</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L=<st1:chmetcnv w:st="on" UnitName="m" SourceValue=".5" HasSpace="False" Negative="False" NumberType="1" TCSC="0">0.5m</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这一段滑板上</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与木块</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">之间的动摩擦因数</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">μ=0.2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，而弹簧的自由端</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">到弹簧固定端</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所对应的滑板上表面光滑。可视为质点的木块</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">质量</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m=<st1:chmetcnv w:st="on" UnitName="kg" SourceValue="1" HasSpace="False" Negative="False" NumberType="1" TCSC="0">1.0kg</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，静止于滑板的左端。滑板</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">受水平向左的恒力</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">F=14.0N</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，作用一定时间后撤去该力，此时木块</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">恰好运动到滑板</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(g</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">取</SPAN><FONT face="Times New Roman"><st1:chmetcnv w:st="on" UnitName="m" SourceValue="10" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>10.0m</SPAN></st1:chmetcnv><SPAN lang=EN-US>/s2)</SPAN></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。试求：</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(1)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">恒力</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">F</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的作用时间</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">；</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(2)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">弹簧贮存的最大弹性势能；</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(3)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">弹簧再次恢复原长时，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">速度各多大？分析论证</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">能否从</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">上落下？</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027531.gif" width=211 onload=javascript:resizepic(this) height=116></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">参考答案及评分意见</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><FONT face="Times New Roman"><st1:chmetcnv w:st="on" UnitName="C" SourceValue="14" HasSpace="True" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>14 C</SPAN></st1:chmetcnv><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN>15 D<SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN>16 B<SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN>17 D<SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN><st1:chmetcnv w:st="on" UnitName="C" SourceValue="18" HasSpace="True" Negative="False" NumberType="1" TCSC="0">18 C</st1:chmetcnv><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN><st1:chmetcnv w:st="on" UnitName="a" SourceValue="19" HasSpace="True" Negative="False" NumberType="1" TCSC="0"><st1:chmetcnv w:st="on" UnitName="a" SourceValue="19" HasSpace="False" Negative="False" NumberType="1" TCSC="0">19 </st1:chmetcnv>A</st1:chmetcnv><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN>20 B<SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN><st1:chmetcnv w:st="on" UnitName="a" SourceValue="21" HasSpace="True" Negative="False" NumberType="1" TCSC="0">21 A</st1:chmetcnv></SPAN></FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">22</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">19</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(1)<SPAN style="mso-spacerun: yes">&nbsp; </SPAN></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">①步骤</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">错误。手应该尽量远离打点计时器</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp; </FONT></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">②步骤</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">错误。应该先接通电源，再松开纸带</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(2)<SPAN style="mso-spacerun: yes">&nbsp; </SPAN>7.70<SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN>7.03<SPAN style="mso-tab-count: 1">&nbsp;&nbsp; </SPAN></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">重物和纸带克服阻力做功消耗了机械能</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> (</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">每空</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(3)<SPAN style="mso-spacerun: yes">&nbsp; </SPAN></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">①</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">；</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">30.75</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">②</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">9.8</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">×</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">104</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">～</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1.2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">×</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">105</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">；</SPAN><SPAN style="FONT-FAMILY: 宋体">π</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">Rd<SUP>2</SUP>/<st1:chmetcnv w:st="on" UnitName="l" SourceValue="4" HasSpace="False" Negative="False" NumberType="1" TCSC="0">4L</st1:chmetcnv></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">③</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电流表不应该采用外接（或电流表应该采用内接）</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">;</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（电路图见右</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（每空</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分，电路图</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027532.gif" width=152 onload=javascript:resizepic(this) height=117></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">23</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">16</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解析：</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(1)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">坠落物做自由落体运动的时间：<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027533.gif" width=59 onload=javascript:resizepic(this) height=39></SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><SPAN style="mso-tab-count: 2"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </FONT></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">地面人员逃离时间<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027534.gif" width=65 onload=javascript:resizepic(this) height=21></SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><SPAN style="mso-tab-count: 2"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </FONT></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">逃离速度<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027535.gif" width=44 onload=javascript:resizepic(this) height=41></SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><SPAN style="mso-tab-count: 2"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </FONT></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">求得</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN>t=3s<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN>v </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">≈</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> <st1:chmetcnv w:st="on" UnitName="m" SourceValue="10.7" HasSpace="False" Negative="False" NumberType="1" TCSC="0">10.7m</st1:chmetcnv>/s<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(2)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">震动同时开始传播，则由匀速运动规律知</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><SPAN style="mso-tab-count: 2"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027536.gif" width=92 onload=javascript:resizepic(this) height=77></FONT></SPAN><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(3</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">求得</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp; </SPAN>s ≈ <st1:chmetcnv w:st="on" UnitName="km" SourceValue="23.3" HasSpace="False" Negative="False" NumberType="1" TCSC="0">23.3km</st1:chmetcnv><SPAN style="mso-spacerun: yes">&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>(2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">或用<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027537.gif" width=92 onload=javascript:resizepic(this) height=47></SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">代入数据解得</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">s ≈ <st1:chmetcnv w:st="on" UnitName="km" SourceValue="23.3" HasSpace="False" Negative="False" NumberType="1" TCSC="0">23.3km</st1:chmetcnv><SPAN style="mso-spacerun: yes">&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;</SPAN></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">可得</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">5</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(3)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">落地速度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN>v<SUB>0</SUB>=gt<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解得</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN>v<SUB>0</SUB>=<st1:chmetcnv w:st="on" UnitName="m" SourceValue="30" HasSpace="False" Negative="False" NumberType="1" TCSC="0">30m</st1:chmetcnv>/s<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">根据牛顿运动定律可知：</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">F</FONT></SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">合</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">△</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t=mv<SUB>0</SUB> <SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>(1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;</SPAN>(F</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">－</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">mg) </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">△</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t=mv<SUB>0</SUB><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-tab-count: 2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp; </SPAN></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">求得</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-tab-count: 1">&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;</SPAN>F=2.8×10<SUP>5</SUP>N<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>(1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">24.</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">18</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解析：设无风时金属杆接入电路的电阻为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，由题意得</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(1)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">无风时</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">U<SUB>1</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027539.gif" width=81 onload=javascript:resizepic(this) height=43></SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，即</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R<SUB>1</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027540.gif" width=117 onload=javascript:resizepic(this) height=47></SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">单位长度的电阻值为：</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">0.5</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">Ω</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">/<st1:chmetcnv w:st="on" UnitName="m" SourceValue=".5" HasSpace="False" Negative="False" NumberType="1" TCSC="0">0.5m</st1:chmetcnv>=1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">Ω</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">/m<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(2)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设风吹时接入电路的电阻为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，则</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;</SPAN>U<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027541.gif" width=85 onload=javascript:resizepic(this) height=43></SPAN><SPAN lang=EN-US></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，即</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027542.gif" width=111 onload=javascript:resizepic(this) height=43></SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">弹簧长度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><st1:chmetcnv w:st="on" UnitName="m" SourceValue=".3" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US><FONT face="Times New Roman">0.3m</FONT></SPAN></st1:chmetcnv></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">压缩量</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">x</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L<SUB>0</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">－</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L=(0.5</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">－</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">0.3)m</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><FONT face="Times New Roman"><st1:chmetcnv w:st="on" UnitName="m" SourceValue=".2" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>0.2m</SPAN></st1:chmetcnv><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN></FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">由平衡得此时风力为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">F</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">kx</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">260N.<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(3)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">由动量定理得</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp; </SPAN>F</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">Δ</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝ρ</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">Sv</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">Δ</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">t v</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">风速为：</SPAN><FONT face="Times New Roman">&nbsp;<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027543.gif" width=124 onload=javascript:resizepic(this) height=49></FONT><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>(2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">25</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">19</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解析</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp; </SPAN>(1)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开始时</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">均向左做匀加速直线运动，其加速度分别为</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>a<SUB>A</SUB>=</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">μ</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">g=<st1:chmetcnv w:st="on" UnitName="m" SourceValue="2" HasSpace="False" Negative="False" NumberType="1" TCSC="0">2m</st1:chmetcnv>/s<SUP>2</SUP></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>a<SUB>B</SUB>=(F</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">—μ</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">mg)/M=<st1:chmetcnv w:st="on" UnitName="m" SourceValue="3" HasSpace="True" Negative="False" NumberType="1" TCSC="0">3 m</st1:chmetcnv>/s<SUP>2</SUP></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </FONT></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">由位移关系</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">s<SUB>B</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">—</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">s<SUB>A</SUB>=L</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">可得</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027544.gif" width=124 onload=javascript:resizepic(this) height=39></FONT></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>(2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </FONT></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">代入数据求得</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-tab-count: 2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>t=1s<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(2)1s</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">末</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-tab-count: 2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>v<SUB>A</SUB>= a<SUB>A</SUB> t=<st1:chmetcnv w:st="on" UnitName="m" SourceValue="2" HasSpace="False" Negative="False" NumberType="1" TCSC="0">2m</st1:chmetcnv>/s</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-tab-count: 5">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>v<SUB>B</SUB>= a<SUB>B</SUB> t=<st1:chmetcnv w:st="on" UnitName="m" SourceValue="3" HasSpace="True" Negative="False" NumberType="1" TCSC="0">3 m</st1:chmetcnv>/s<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp; </FONT></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">撤去外力</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">F</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">后弹簧被压缩，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">继续加速，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开始减速，加速度均变大。当</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">速度相同时弹簧压缩量最大，具有最大弹性势能。根据系统动量守恒可得</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027545.gif" width=155 onload=javascript:resizepic(this) height=23></FONT></SPAN><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>(2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-tab-count: 2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">弹簧贮存的最大弹性势能为</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027546.gif" width=287 onload=javascript:resizepic(this) height=39></FONT></SPAN><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>(2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;</SPAN>E<SUB>m</SUB>=0.4J<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">(3)</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">从弹簧压缩最短开始，在弹力作用下</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">将向左做加速度减小的加速运动，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">做加速度减小的减速运动，直到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与弹簧分离，设此时</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">速度分别为υ</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">′、υ</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">′。</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp; </FONT></SPAN></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">由动量守恒定律得</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes"><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027547.gif" width=176 onload=javascript:resizepic(this) height=24>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">由能量守恒定律得</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes"><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/03/1005027548.gif" width=252 onload=javascript:resizepic(this) height=41>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">代入数据得</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">υ</SPAN><SUB><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN></SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">′</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">=<st1:chmetcnv w:st="on" UnitName="m" SourceValue="3.6" HasSpace="False" Negative="False" NumberType="1" TCSC="0">3.6m</st1:chmetcnv>/s</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">υ</SPAN><SUB><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN></SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">′</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">=<st1:chmetcnv w:st="on" UnitName="m" SourceValue="2.6" HasSpace="False" Negative="False" NumberType="1" TCSC="0">2.6m</st1:chmetcnv>/s</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>(1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">弹簧再次恢复原长后，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">将进入粗糙区做匀减速运动，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">做匀加速运动</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">现假设</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不会从</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">上掉下，最终</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">共速</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">根据系统动量守恒得：此时的共同速度与弹簧弹性势能最大时的共同速度相同。那么，从能量转化守恒知，弹簧的最大弹性势能将全部转化为此过程摩擦生热</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">即</SPAN><FONT face="Times New Roman"> <SPAN lang=EN-US>E<SUB>m</SUB>=</SPAN></FONT><SPAN style="FONT-FAMILY: 宋体">μ</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>g</SPAN><SPAN style="FONT-FAMILY: 宋体">△</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">s</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">代入数据得</SPAN><SPAN style="FONT-FAMILY: 宋体">△</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">s =<st1:chmetcnv w:st="on" UnitName="m" SourceValue=".2" HasSpace="False" Negative="False" NumberType="1" TCSC="0">0.2m</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，因</SPAN><SPAN style="FONT-FAMILY: 宋体">△<SPAN lang=EN-US>s</SPAN>＜</SPAN><FONT face="Times New Roman"> <SPAN lang=EN-US>L</SPAN></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，故</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不会从</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">上掉下来，最后</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">以相同速度向左做匀速运动。</SPAN><FONT face="Times New Roman"> <SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>(2</SPAN></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>]]></description><author>黑总</author><pubDate>2011-3-10 11:12:22</pubDate></item><item><title><![CDATA[我们与“上帝”有多远？]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005034040.aspx</link><description><![CDATA[<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">由于儿子的原因，我近段时间迷上了探索节目。看得越多，越觉得咱们中国人比欧美人落后的不只是经济，最可怕的是科技上的落后与想像力的落后。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在探索节目中，不断的接触到新的思想，由于我是学物理的，基本上都还可以接受。但这次我看到的一集探索节目中的观点，却让我有些目瞪口呆，居然有科学家认为，我们这个世界（或者说是宇宙）只是“上帝”在一台超级计算机上创造出来的一种游戏模拟，我们人类也仅仅是这种虚拟游戏中的模拟人物而已，我们的命运完全取决于上帝，只要上帝将计算机的电源插头拔掉，我们就都全部消失。当我们自己计算机技术发展到一定水平后，我们也能变成上帝，同样的可以创造出与我们生活的宇宙同样复杂的虚拟世界，我们同样的可以操纵这个虚拟世界中的人物的命运。</SPAN></P>
<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">事实上，这种观点在好莱坞电影中有体现，其中让我最震撼的一部电影就是《异次元骇客》，科学家贺道格等人在电脑中创造出一个虚拟的世界，他俨然成为这个虚拟世界的上帝，但却不知道他自己也是被虚拟创造出来的，其中他与他的创始人传珍尼在超市中的对话让我感叹人生之意义何在。“我觉得我们好像在哪儿见过”，“也许是在另一世”，有些庄生梦蝶的意思。好长一段时间让我怀疑我自身存在的真实性。而《盗梦空间》的创意与此类似，从所谓“境界”上来看还不如《异次元骇客》，《黑客帝国》虽然与《异次元骇客》有相似之处，但哲理上不够深刻。</SPAN></P>
<P style="TEXT-INDENT: 21.75pt; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这几天我都在想这个事，渐渐的我觉得此看法有道理。“迷信”的人认为，人的命运是由上天也就是“神”早就安排好的，你什么时候出生，什么时候死亡，你一生的所有经历都是由“神”来安排的，自己根本就无法左右，小时候我的婆婆就经常这样教育我。这就好比创造我们的上帝早就编好了程序，我们只是其中的一组“代码”而已。想到这儿，突然明白了一句话的道理，“人类一思考，上帝就会笑”，如果真的是如此，那么“上帝”就可以随时改变游戏规则，我们现在认识的自然规律随时都可能被“上帝”改变，如果有一天我们突然发现我们以前对自然规律的认识是完全错误的，请不要奇怪，这不怪我们的祖先，因为上帝改变了游戏规则，我们作不了主。事实上，从这个意义上讲，我们这个世界极有可能就是上帝生存的的“仙界”众生在我们这个模拟世界中的一种投影。那么，我们的思想也就反映了“众神”的思想。当上帝对由他创造的这个世界不满意时，他可以随时“删除”这个游戏，如果愿意的话，上帝会创造出另一个游戏，也就是创造出了另一个世界接着玩。那我们“存在”的意义何在？我们也许一出生就是用来供“上帝”玩的，那还有什么意思！</SPAN></P>
<P style="TEXT-INDENT: 21.75pt; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">事实上，自古以来，就有科学家就认为我们这个世界不应该是太复杂，而应该是简单和谐完美的，科学家的任务就是怎么从表面上看纷繁复杂的现象中找到简单的本质，如果从上帝创世说来看也很好理解，作为游戏的设计者，当然不可能将程序设计得过于复杂。现代科学的发展也证实了一个真理：任何东西从局部来看都是非常简单的，再复杂的事物与过程都是由最简单的“单元”构成，就好比我们小时候玩过的积木一样。文章是由基本的文字组合成的，只是不同的组合就让人感觉有不同的效果，所以文章有所谓“好”与“坏”之分，物体都是由最小的单元组成，只是组合方式不同，就产生了世间万物。现代科学的发展不断的在印证上帝创世说。</SPAN></P>
<P style="TEXT-INDENT: 21.75pt; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: Arial; COLOR: #111111; FONT-SIZE: 11.5pt" lang=EN-US>2000</SPAN><SPAN style="FONT-FAMILY: 宋体; COLOR: #111111; FONT-SIZE: 11.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial">年以前，柏拉图提出设想说：真实的世界只是存在于我们的想象中。现代科学技术已经发展到可以在一个指甲大的芯片上模拟自然界中的各种现象与过程，大到宇宙形成，小到植物的发芽过程演示。所以，什么是真实的，就不得不让人大伤脑筋。如果我们真的是一个一个的模拟人物，那生存的意义何在？我们能不能像“异次元骇各”中的贺道格一样从虚拟的模拟挣脱出来成为真正的“人”，看来，我们的祖先的“成仙”的想法并不是没有道理，“成仙”可能也就是变成一个“真正”的人，就是这么简单。</SPAN></P>
<P style="TEXT-INDENT: 21.75pt; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
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<P style="TEXT-INDENT: 21.75pt; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>]]></description><author>黑总</author><pubDate>2011-3-3 23:18:51</pubDate></item><item><title><![CDATA[困惑：关于爱国]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1005011152.aspx</link><description><![CDATA[<P style="TEXT-INDENT: 21pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我爱国吗？从小到大都被教育要热爱祖国，为了祖国的利益可以牺牲自己的生命。学生时代，岳母在岳飞身上刺上“精忠报国”的故事让我热血沸腾，觉得爱国是一个老百姓天生就应该具有的素质，多少年来，我对此信念没有一丝一豪的怀疑，在中小学时代，我一边从报纸上天天看到国家取得的一个又一个的伟大成就，兴奋至极，一边吃着稀饭下咸菜，睡在冰冷坚硬的木板床上，在寒冷的冬夜里做着美梦：咱们的祖国正在大踏步的向前进，真带劲！直到现在，我还是认为爱国是一个人的基本道德底线。但是，多年来，目睹的许多的事，让我对“爱国”的含义有了诸多疑问。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"><FONT face="Times New Roman">&nbsp;&nbsp;&nbsp; </FONT></SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">去年，官方大肆的宣传，庆祝“祖国”建国六十周年，这样的提法让我困惑，我们伟大的祖国才六十年，那之前的“中国”是不是我的“国”？我的祖辈还是不是“中国人”。深入思考下来，让我对“爱国”与“爱民族”有了新的认识。从小，我们的教育是这样的，我们的国家有五千年的辉煌灿烂的悠久的历史，在科技文体经济等方面领先世界几千年，我们应该为作为一个中国人而感到自豪。但从小到大，我就没有真正的感到作为一个中国人有什么值得自豪的地方，普通老百姓生活水平低下，社会公共福利制度全面缺失，在全世界排名靠后，科技总体水平同样落后，文化领域上来看，没有一部像样的当代文学作品让我阅读，十多亿人口却没有一个人获得科学文化领域的最高奖：诺贝尔奖。我只能从我们的老祖宗那儿去寻求心理上的安慰。对外，当咱们“中国人”受到外国人“欺辱”的时候，基本上都是忍气吞声，说不上一句硬话，这与美国等国家的行为形成强烈的对比，你让我怎么提起精神来爱国。</SPAN></P>
<P style="TEXT-INDENT: 21.75pt; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">本来，现在咱们祖国经济成长到了全世界第二的水平了，小老百姓们应该更爱国了，但我却发现不是这么回事，左思右想，终于找到了原因：那就是公平，如果国家取得的成就与普通小老百姓无关或者关系不大时，国家成就越大，反而会激起更大的怨愤。教科书上说，咱们都是国家的主人，小时候是无条件的相信，但成人之后，我却发现我不是“主人”，国家的什么事，无论大小，我都作不了“主”。首先是我的工资的多少我作不了主，国家</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">GDP</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">年年快速增长，但我的工资就是多年徘徊在一个低档次上，而另一小部分人的工资收入却节节上升，新的权贵阶层却大量的出现，他们捞钱比我撒尿都要容易，更可恶的是，这些权贵阶层一方面在“教育”我们要爱国爱党，另一方面却纷纷的移民国外，都到可恶的资本主义国家去“受苦”，让我等小屁民说什么好！另外一个重要的方面，那就是普通老百姓对政府的行为没有发言权监督权，比如，我们与周边国家的边界谈判，国家就不让我等普通老百姓知道内情，当然更不可能听一下普通老百姓的意见了，国家办了很多的“盛会”，大把大把的花钱，也不问问老百姓同意不！结果是花钱图个面子，对老百姓没有一点实际好处，政府热衷于搞基建修“商品房”，大量的银子花在钢筋混泥土上，于是城市越来越漂亮，但是，当我等普通老百姓徘徊于大城市的高楼大厦之中时，不会觉得这与我有关，这些东西是属于“我爸是李刚”、“我是某某局局长”之类的上层人士的！年龄越大，越觉得这个国家好像与我无关，既然这样，我又怎么有理由来爱这个城市甚至这个国家。</SPAN></P>
<P style="TEXT-INDENT: 21.75pt; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">我们的教育在不断的告诉我们亡国的伤痛，意思是千万不要做亡国奴！小时候，我深信做亡国奴是一件非常可怕的事！比要了我自己的命还要可怕！这也是“爱国”教育的一种。小时候，每当在电影中看到可恶的“日本鬼子”进村的时候，就有一种强烈的“亡国”危机，恨不得将日本鬼子全部杀光。但后来我对于“亡国”的理解出现越来越多的疑问。看看历史，我“中国”实际上是经过了多个民族统治的，像西晋时的“五胡乱华”、蒙古人建立的元朝、女真族建立的清朝，汉族建立的国家也不只是“亡国”一次两次了，我们还不是一样的生存了下来，而且还将这些灭亡了我们汉族的民族看作是一个家人。犹太人“亡国”的时间很长，到现在同样的生存下来。香港人</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">100</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">年来都在做“亡国奴”，但人家的生活水准却比我们内陆的普通老百姓好得多……。</SPAN></P>
<P style="TEXT-INDENT: 21.75pt; MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不可否认，直到现在我仍然是一个强烈的“爱国主义”者，但我却发现国家缺乏对我这种小老百姓的爱。那我究竟“爱国”还是“不爱国”？“爱国”的意义在哪儿？</SPAN></P>]]></description><author>黑总</author><pubDate>2011-2-24 14:02:05</pubDate></item><item><title><![CDATA[重庆市高2011级六校联考一诊理科综合试题物理部分]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1004996112.aspx</link><description><![CDATA[<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman">2010</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2011</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">学年度第一学期期末六校联考高三理综试题</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">本试卷分为第</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">I</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">卷（选择题）和</SPAN><SPAN style="FONT-FAMILY: 宋体">第Ⅱ</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">卷（非选择题）两部分，满分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">300</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分，考试时间</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">150</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分钟。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">第</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">I</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">卷（选择题共</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> 126 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一、本部分包括</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">21</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">小题，每小题</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">6</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分，共</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">126</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分．每小题早有</SPAN><U><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.5pt">一个选项</SPAN></U><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">符合题意</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">14</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．根据热力学定律，下列判断正确的是（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> ) </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．我们可以把火炉散失到周围环境中的能量全部收集到火炉中再次用来取暖</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．利用浅层海水和深层海水间的温度差制造出一种热机，将海水的一部分内能转化为机械能，这在原理上是可行的</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．制冷系统能将冰箱内的热量传给外界较高温度的空气，而不引起其它变化</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．满足能量守恒定律的客观过程都可以自发地进行</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">l5</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．一列简谐横波沿直线由</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">a</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">向</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">b</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">传播，相距</SPAN><?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="10.5" UnitName="m" w:st="on"><SPAN lang=EN-US><FONT face="Times New Roman">10.5m</FONT></SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>a</SPAN><SPAN style="FONT-FAMILY: 宋体">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">b</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">两处的质点振动图象如图中</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">a</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> b</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示，则（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> ) </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．该波的振幅可能是</SPAN><FONT face="Times New Roman"><st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="20" UnitName="cm" w:st="on"><SPAN lang=EN-US>20cm</SPAN></st1:chmetcnv><SPAN lang=EN-US> </SPAN></FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．该波的波长可能是</SPAN><FONT face="Times New Roman"><st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="8.4" UnitName="m" w:st="on"><SPAN lang=EN-US>8.4m</SPAN></st1:chmetcnv><SPAN lang=EN-US> </SPAN></FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．该波的波速可能是</SPAN><FONT face="Times New Roman"><st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="10.5" UnitName="m" w:st="on"><SPAN lang=EN-US>10.5m</SPAN></st1:chmetcnv><SPAN lang=EN-US>/s </SPAN></FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．该波由</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">a</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">传到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">b</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">可能历时</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">7s</FONT></SPAN></P><SPAN lang=EN-US><?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" /><v:shapetype id=_x0000_t75 coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f"><v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"></v:path><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:lock v:ext="edit" aspectratio="t"></o:lock></v:shapetype>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878731.jpg" width=171 onload=javascript:resizepic(this) height=149></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">16</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．如图所示，固定的光滑斜面上，有一物体</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">P</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">放在物体</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">Q</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">上，二者一道以某一初速度沿斜面向上滑行，然后滑下．上行和下滑过程中两者始终保持相对静止．下列说法中正确的是（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> ) </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．上升过程中</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">P</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">受</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">Q</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的摩擦力方向向上</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．下滑过程中</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">P</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">受</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">Q</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的摩擦力方向向上</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．上升过程中</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">P</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不受</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">Q</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的摩擦力</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．下滑过程中</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">P</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">受</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">Q</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的摩擦力方向向下</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878732.jpg" width=175 onload=javascript:resizepic(this) height=142></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">17</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．带负电的粒子在某电场中仅受电场力作用，能分别完成以下两种运动：</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">①</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在电场线上运动，</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">②</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在等势面上做匀速圆周运动．该电场可能由（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> ) </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．一个带负电的点电荷形成</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．一个带正电的点电荷形成</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．两个带等量负电的点电荷形成</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．两个平行金属板带等量的异种电荷形成</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">18</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．跳伞运动员从高度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">H</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处由静止下落，假设运动员沿直线运动，经历加速下降和减速下降两个过程，最后以速度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">v</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">着地．将运动员和伞看成一个系统，总质量为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．在这两个过程中，下列说法正确的是（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> ) .</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．阻力对系统始终做负功，全程做功等于<IMG onmousewheel="return bbimg(this)" border=0 align=center src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878734.gif" width=97 onload=javascript:resizepic(this) height=41></SPAN><SPAN lang=EN-US><SUB></SUB></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．系统受到的合外力始终做正功，全程做功等于<IMG onmousewheel="return bbimg(this)" border=0 align=center src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878735.gif" width=45 onload=javascript:resizepic(this) height=41></SPAN><SPAN lang=EN-US><SUB></SUB></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．重力在加速过程中做的功比减速过程中做的功多</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．重力在加速过程中做的功比减速过程中做的功少</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">19</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．光滑的水平面上固定着一个螺旋形光滑水平轨道，俯视如图所示．一个小球以一定速度沿轨道切线方向进入轨道，以下关于小球运动的说法中正确的是（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> ) </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．轨道对小球做正功，小球的线速度不断增大</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．轨道对小球做正功，小球的角速度不断增大</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．轨道对小球不做功，小球的角速度不断增大</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．轨道对小球不做功，小球的速度不断增大</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878733.jpg" width=118 onload=javascript:resizepic(this) height=139></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">20</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．如图所示，在一真空区域中，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">AB</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CD</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是圆</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的两条直径，在</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">两点各放置电荷量均为＋</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">Q</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的点电荷，关于</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">两点的电场强度和电势，下列说法正确的是（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> ) </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．场强相同，电势相等</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．场强不同，电势相等</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．场强相同，电势不相等</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．场强不相同，电势不相等</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878736.jpg" width=144 onload=javascript:resizepic(this) height=161></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">21</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．在研究微型电动机的性能时，应用如图所示的实验电路，当调节滑动变阻器</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">并控制电动机停止转动时，电流表和电压表的示数分别为</SPAN><st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="0.5" UnitName="a" w:st="on"><SPAN lang=EN-US><FONT face="Times New Roman">0.50A</FONT></SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2.0V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．重新调节</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">并使电动机恢复正常运转，此时电流表和电压表的示数分别为</SPAN><st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="2" UnitName="a" w:st="on"><SPAN lang=EN-US><FONT face="Times New Roman">2.0A</FONT></SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">24.0V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．若电流表和电压表均可视为理想表，则这台电动机正常运转时输出功率为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">32W<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">44W<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">47W<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>D</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">48W</FONT></SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878737.jpg" width=125 onload=javascript:resizepic(this) height=121></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体">第Ⅱ</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">卷（非选择题共</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> 174 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">22</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">( 19 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( l ) (3</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）有一同学用游标卡尺上标有</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">20</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">等分刻度的游标卡尺测一工件的长度，测得结果如图所示，则该工件的长度</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> L</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">___________________cm.</FONT></SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878738.jpg" width=363 onload=javascript:resizepic(this) height=114></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 2 ) ( 6</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）某同学在探究木块与木板的动摩擦因数的实验时，设计了两种方案．</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方案</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A : </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">木板水平固定，通过弹簧秤水平拉动木块，如图（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> a ) ;</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方案</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> B :</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">木块固定，通过细线水平拉动木板，如图</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(b</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> .</FONT></SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878739.jpg" width=500 onload=javascript:resizepic(this) height=130></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">上述两方案中，你认为更合理的方案是</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">______</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，该实验中需要测量的物理量是</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">______.</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 3 ) ( 10</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）一直流电压表，量程为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1V ,</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">内阻为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1000</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体">Ω</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，现将一阻值为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">500</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>0</SPAN><SPAN style="FONT-FAMILY: 宋体">～</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">7000</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体">Ω</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">之间的固定电阻</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R<SUB>1</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与此电压表串联，以扩大电压表的量程．为求得扩大后量程的准确值，再给定一直流电源（电动势</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">E</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为</SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>6</SPAN><SPAN style="FONT-FAMILY: 宋体">～</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">7V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，内阻可忽略不计），一阻值</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SUB><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>2</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体">＝<SPAN lang=EN-US>2</SPAN></SPAN><SPAN lang=EN-US><FONT face="Times New Roman">000</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体">Ω</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的固定电阻，两个单刀开关</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S<SUB>1</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S<SUB>2</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">及若干导线．</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">①</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为达到上述目的，将答题卡上对应的图连成一个完整的实验电路图．</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">②</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">连线完成以后，当</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S<SUB>1</SUB> </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">与</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S<SUB>2</SUB> </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">均闭合时，电压表的示数为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">0. 90V </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">；当</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S<SUB>1</SUB> </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">闭合，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">S<SUB>2</SUB> </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">断开时，电压表的示数为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">0.70V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，由此可以计算出改装后电压表的量程为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">______V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，电源电动势为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">__________V.</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">23</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(16</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）如图所示为宇宙中一恒星系的示意图，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为该星系的一颗行星，它绕中央恒星</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的运行轨道近似为圆．已知引力常量为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">G</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，天文学家观测得到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">行星的运行轨道半径为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> R<SUB>0</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，周期为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">T<SUB>0</SUB>. A </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">行星的半径为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">r<SUB>0</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，其表面的重力加速度为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">g</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，不考虑行星的自转．</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( l </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）中央恒星</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">O</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的质量是多大？</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 2 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）若</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">行星有一颗距离其表面为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">h</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">做圆周运动的卫星，求该卫星的线速度大小．（忽略恒星对卫星的影响）</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878740.jpg" width=114 onload=javascript:resizepic(this) height=129></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">24</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(18</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）如图所示，绝缘光滑水平轨道</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">AB</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端与处于竖直平面内的四分之一圆弧形粗糙绝缘轨道</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">BC</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">平滑连接，圆弧的半径</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体">＝</SPAN><FONT face="Times New Roman"><st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="0.4" UnitName="m" w:st="on"><SPAN lang=EN-US>0.40m</SPAN></st1:chmetcnv><SPAN lang=EN-US> </SPAN></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．在轨道所在空间存在水平向右的匀强电场，电场强度</SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>E</SPAN><SPAN style="FONT-FAMILY: 宋体">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1.0×10<SUP>4</SUP>N/C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．现有一质量</SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>m</SPAN><SPAN style="FONT-FAMILY: 宋体">＝</SPAN><st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="0.1" UnitName="kg" w:st="on"><SPAN lang=EN-US><FONT face="Times New Roman">0.10kg</FONT></SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的带电体（可视为质点）放在水平轨道上与</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端距离</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">s=<st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="1" UnitName="m" w:st="on">1.0m</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的位置，由于受到电场力的作用带电体由静止开始运动，当运动到圆弧形轨道的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端时，速度恰好为零．已知带电体所带电荷量</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">q=8.0×1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>0</SPAN><SUP><SPAN style="FONT-FAMILY: 宋体">－<st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="5" UnitName="C" w:st="on"><SPAN lang=EN-US>5</SPAN><SPAN style="VERTICAL-ALIGN: baseline" lang=EN-US>C</SPAN></st1:chmetcnv></SPAN></SUP><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，取</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">g=<st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="10" UnitName="m" w:st="on">10m</st1:chmetcnv>/s<SUP>2</SUP></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，求：</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( l </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）带电体在水平轨道上运动的加速度大小及运动到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端时的速度大小；</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 2 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）带电体运动到圆弧形轨道的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端时对圆弧轨道的压力大小；</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 3 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）带电体沿圆弧形轨道从</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端运动到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">C</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端的过程中，摩擦力做的功．</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878741.jpg" width=200 onload=javascript:resizepic(this) height=134></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">25</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">(l9</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）如图所示，光滑水平面上静止一质量为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">M = 0.9</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>8</SPAN><SPAN style="FONT-FAMILY: 宋体">㎏</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的物块．紧挨平台右侧有传送带，与水平面成</SPAN><SPAN style="FONT-FAMILY: 宋体">θ</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> = 3</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>0</SPAN><SPAN style="FONT-FAMILY: 宋体">°</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">角，传送带底端</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点和顶端</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点相距</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">L = <st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="3" UnitName="m" w:st="on">3m</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．一颗质量为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">m</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> <st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="0.02" UnitName="kg" w:st="on">0.02kg</st1:chmetcnv></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的子弹，以</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">v<SUB>0</SUB></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><FONT face="Times New Roman"><st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="300" UnitName="m" w:st="on"><SPAN lang=EN-US>300m</SPAN></st1:chmetcnv><SPAN lang=EN-US>/s</SPAN></FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的水平向右的速度击中物块并陷在其中．物块滑过水平面并冲上传送带，物块通过</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">点前后速度大小不变．已知物块与传送带之间的动摩擦因数</SPAN><SPAN style="FONT-FAMILY: 宋体">μ</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">0.2<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878742.gif" width=24 onload=javascript:resizepic(this) height=24></FONT><SUB></SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，重力加速度</SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>g</SPAN><SPAN style="FONT-FAMILY: 宋体">＝</SPAN><FONT face="Times New Roman"><st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="10" UnitName="m" w:st="on"><SPAN lang=EN-US>10m</SPAN></st1:chmetcnv><SPAN lang=EN-US>/s<SUP>2</SUP>, </SPAN></FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( l </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）如果传送带静止不动，求物块在传送带上滑动的最远距离；</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 2 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）如果传送带顺时针匀速运行（如图），为使物块能滑到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端，求传送带运行的最小速度：</SPAN><FONT face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">( 3 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）若物块用最短时间从</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">A</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端滑到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端，求此过程中传送带对物块做的功．</SPAN></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878743.jpg" width=202 onload=javascript:resizepic(this) height=112></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face="Times New Roman">&nbsp;</FONT></o:p></SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">物理参考答案</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">14.B 15.D 16.C 17.B 18.A 19.C 20.B 21.A</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman">22.(1)5.015<SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN>(3</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">)</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">B </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">木块的重力</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">G</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和弹簧秤的接力</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">F<SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">6</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">3</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">7<SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN>6.3</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><FONT face="Times New Roman"><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878753.jpg" width=154 onload=javascript:resizepic(this) height=133></FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"></FONT></SPAN>&nbsp;</P><SPAN lang=EN-US><FONT face="Times New Roman">
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US>23.</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US>16</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）解：（</SPAN><SPAN lang=EN-US>1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）设中央恒星</SPAN><SPAN lang=EN-US>O</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的质量为</SPAN><SPAN lang=EN-US>M</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">行星的质量为</SPAN><SPAN lang=EN-US>m</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，则由万有引力定律和牛顿第二定律得</SPAN><SPAN lang=EN-US><SUB><v:shapetype id=_x0000_t75 coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f">&nbsp;<v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"></v:path><o:lock v:ext="edit" aspectratio="t"></o:lock></v:shapetype></SUB><SPAN style="mso-spacerun: yes">&nbsp;<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878755.gif" width=124 onload=javascript:resizepic(this) height=48>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(5</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解得</SPAN><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878754.gif" width=85 onload=javascript:resizepic(this) height=48>&nbsp;&nbsp;&nbsp;</SPAN><SUB></SUB><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>(2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）设卫星的质量为</SPAN><SPAN lang=EN-US>m</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>0</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体">，由题意可知：<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878756.gif" width=163 onload=javascript:resizepic(this) height=48></SPAN><SPAN lang=EN-US><SUB></SUB><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US>4</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><SUB></SUB><SPAN style="mso-spacerun: yes"><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878757.gif" width=96 onload=javascript:resizepic(this) height=48>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US>3</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解得：<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878758.gif" width=87 onload=javascript:resizepic(this) height=53></SPAN><SPAN lang=EN-US><SUB></SUB><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分）</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US>24.</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US>18</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）解：（</SPAN><SPAN lang=EN-US>1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）设带电体在水平轨道上运动的加速度大小为</SPAN><SPAN lang=EN-US>a</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，根据牛顿第二定律</SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><I style="mso-bidi-font-style: normal"><SPAN lang=EN-US>qE=ma<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN></I><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解得</SPAN><I style="mso-bidi-font-style: normal"><SPAN lang=EN-US>a=qE</SPAN></I><SPAN lang=EN-US>/<I style="mso-bidi-font-style: normal">m<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></I>(3</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设带电体运动到</SPAN><SPAN lang=EN-US>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端时的速度为</SPAN><SPAN lang=EN-US>v</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>B</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体">，则<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878760.gif" width=61 onload=javascript:resizepic(this) height=24><SPAN lang=EN-US><SUB></SUB><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN></SPAN></SPAN><I style="mso-bidi-font-style: normal"><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;</SPAN></SPAN></I><SPAN lang=EN-US>(2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解得：<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878761.gif" width=111 onload=javascript:resizepic(this) height=25></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US><SUB></SUB></SPAN><SPAN lang=EN-US>m/s<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><I style="mso-bidi-font-style: normal"><SPAN style="mso-spacerun: yes">&nbsp;</SPAN></I>(1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US>(2)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设带电体运动到圆轨道</SPAN><SPAN lang=EN-US>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端时受轨道的支持力为</SPAN><SPAN lang=EN-US>F<SUB>N</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，根据牛顿第二定律</SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><SUB></SUB><SPAN style="mso-spacerun: yes"><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878762.gif" width=109 onload=javascript:resizepic(this) height=44>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><I style="mso-bidi-font-style: normal"><SPAN style="mso-spacerun: yes">&nbsp;</SPAN></I>(3</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解得：<IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878763.gif" width=147 onload=javascript:resizepic(this) height=44></SPAN><SPAN lang=EN-US><SUB></SUB>N<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;</SPAN></SPAN><I style="mso-bidi-font-style: normal"><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;</SPAN></SPAN></I><SPAN lang=EN-US>(2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">根据牛顿第三定律可知，带电体对圆弧轨道</SPAN><SPAN lang=EN-US>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">端的压力大小</SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><SUB></SUB><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878764.gif" width=97 onload=javascript:resizepic(this) height=24>N<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><I style="mso-bidi-font-style: normal"><SPAN style="mso-spacerun: yes">&nbsp;</SPAN></I>(1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US>(3)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设带电体沿圆弧轨道运动过程中摩擦力所做的功为</SPAN><SPAN lang=EN-US>W</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">摩</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，根据动能定理</SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US><SUB></SUB><SPAN style="mso-spacerun: yes"><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878765.gif" width=187 onload=javascript:resizepic(this) height=41>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><I style="mso-bidi-font-style: normal"><SPAN style="mso-spacerun: yes">&nbsp;</SPAN></I>(4</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">因电场力做功与路径无关，所以带电体沿圆弧形轨道运动过程中，电场力所做的功</SPAN></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><SPAN lang=EN-US>W</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">＝</SPAN><SPAN lang=EN-US>qE</SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>R</SPAN><SPAN style="FONT-FAMILY: 宋体">＝</SPAN><SPAN lang=EN-US>0.32J<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">联立解得：</SPAN><SPAN lang=EN-US>W</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">摩</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体">＝－<SPAN lang=EN-US>0.72J<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN></SPAN><SPAN lang=EN-US>(1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US>25.(19)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解：（</SPAN><SPAN lang=EN-US>1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）设子弹击中物体后共同速度为</SPAN><SPAN lang=EN-US>v</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，根据动量守恒：</SPAN><SPAN lang=EN-US>mv<SUB>0</SUB>=(m+M)v<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN>(2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设物块滑上传送带的最远距离为</SPAN><SPAN lang=EN-US>s</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，根据动能定理得：</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><SUB></SUB><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">代入数据可得：</SPAN><SPAN lang=EN-US>s=<st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="2.25" UnitName="m" w:st="on">2.25m</st1:chmetcnv><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>(2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US>(2)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设传送带为</SPAN><SPAN lang=EN-US>v<SUB>1</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，物块刚好能滑到传送带顶端，当物块速度大于</SPAN><SPAN lang=EN-US>v<SUB>1</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，物块所受摩擦力沿斜面向下，高此阶段物块加速度为</SPAN><SPAN lang=EN-US>a<SUB>1</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，根据牛顿定律得：</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US>(m+M)gsin30°+μ(m+M)gcos30°=(m+M)a<SUB>1<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SUB>(2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">此过程物块的位移为</SPAN><SPAN lang=EN-US>s</SPAN><SUB><SPAN style="FONT-FAMILY: 宋体" lang=EN-US>1</SPAN></SUB><SPAN style="FONT-FAMILY: 宋体">，则<SPAN lang=EN-US><SUB><v:shape style="WIDTH: 99pt; HEIGHT: 18pt" id=_x0000_i1037 o:ole="" type="#_x0000_t75"> <v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image025.wmz"></v:imagedata></v:shape></SUB><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN></SPAN></SPAN><SPAN lang=EN-US>(1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">物块的速度减小到</SPAN><SPAN lang=EN-US>v<SUB>1</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">后，所受摩擦力沿斜面向上，加速度变为</SPAN><SPAN lang=EN-US>a<SUB>2</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，则</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US>(m+M)gsin30</SPAN><SPAN style="FONT-FAMILY: 宋体">°－</SPAN><SPAN lang=EN-US>μ(m+M)gcos30°=(m+M)a<SUB>2<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SUB>(2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设物块的速度从</SPAN><SPAN lang=EN-US>v<SUB>1</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">减小到零时位移为</SPAN><SPAN lang=EN-US>s<SUB>2</SUB></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，则：</SPAN><SPAN lang=EN-US><SUB><v:shape style="WIDTH: 47.25pt; HEIGHT: 36pt" id=_x0000_i1038 o:ole="" type="#_x0000_t75"> <v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image027.wmz"></v:imagedata></v:shape></SUB><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;</SPAN></SPAN><SPAN lang=EN-US>(1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">由题意：</SPAN><SPAN lang=EN-US>s<SUB>1</SUB>+s<SUB>2</SUB>=L<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN></SPAN><SPAN style="FONT-FAMILY: 宋体" lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;</SPAN></SPAN><SPAN lang=EN-US>(1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">由以上各式可得：</SPAN><SPAN lang=EN-US>v<SUB>1</SUB>=<st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="2" UnitName="m" w:st="on">2m</st1:chmetcnv>/s<SUB><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SUB>(2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US>(3)</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为使物块滑到顶端所需时间最短，物块所受摩擦力必须始终沿斜面向上，</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US>W=μ(m+M)gcos30°L<SUB><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN></SUB>(3</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">代入数据得：</SPAN><SPAN lang=EN-US>W=9J<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>(1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN lang=EN-US>)</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">说明：用其它方法求解，若正确也给分。</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal></FONT></SPAN>&nbsp;</P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"></FONT></SPAN>&nbsp;</P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"></FONT></SPAN>&nbsp;</P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN lang=EN-US><FONT face="Times New Roman"></FONT></SPAN>&nbsp;</P>]]></description><author>黑总</author><pubDate>2011-2-16 17:16:21</pubDate></item><item><title><![CDATA[重庆市万州区2011届高三第一次诊断性考试（理综物理含答案）]]></title><link>http://blog.stnn.cc/xyh1970830/Efp_Bl_1004989318.aspx</link><description><![CDATA[<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">高</SPAN><FONT face=宋体><SPAN lang=EN-US>2011</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">级第一次诊断性监测</SPAN></FONT></P>
<P style="TEXT-ALIGN: center; MARGIN: 0cm 0cm 0pt" class=MsoNormal align=center><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 22pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">理科综合能力测试试题卷物理部分</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-SIZE: 22pt" lang=EN-US><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></B></P>
<P style="TEXT-INDENT: 13.45pt; MARGIN: 0cm 0cm 0pt; tab-stops: 21.0pt 115.35pt 210.05pt 304.45pt 377.85pt; mso-char-indent-count: 1.28" class=MsoNormal><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">本试卷分第</SPAN><FONT face=宋体><SPAN lang=EN-US>I</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">卷（选择题）和第</SPAN><SPAN lang=EN-US>II</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">卷（非选择题）两部分。全卷共</SPAN><SPAN lang=EN-US>300</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">分，考试时间为</SPAN><SPAN lang=EN-US>150</SPAN></FONT></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: 32.15pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 2.0" class=MsoNormal align=center><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 16pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">第</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 16pt">Ⅰ</SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 16pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">卷</SPAN></B><FONT face=宋体><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-SIZE: 16pt" lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN></SPAN></B><B style="mso-bidi-font-weight: normal"><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 16pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">选择题</SPAN></B><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（共</SPAN><SPAN lang=EN-US>126</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">分）</SPAN></FONT></P>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>14</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，质量为</SPAN><SPAN lang=EN-US>m</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的探空气球正在匀速下降，若气球所受浮力</SPAN><SPAN lang=EN-US>F</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">始终保持不变，气球在运动过程中所受阻力仅与速率有关，重力加速度为</SPAN><SPAN lang=EN-US>g</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">。现欲使该气球以同样速率匀速上升，则需从气球篮中减少的质量为</SPAN></FONT></P>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：</SPAN></FONT><SPAN style="FONT-FAMILY: 宋体" lang=EN-US><SUB><?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" /><v:shapetype id=_x0000_t75 stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600">&nbsp;<IMG onmousewheel="return bbimg(this)" border=0 align=center src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878053.gif" width=20 onload=javascript:resizepic(this) height=44><v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><o:lock aspectratio="t" v:ext="edit"></o:lock></v:shapetype></SUB></SPAN><FONT face=宋体><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：</SPAN><SPAN lang=EN-US>m</SPAN></FONT><SPAN style="FONT-FAMILY: 宋体">－<IMG onmousewheel="return bbimg(this)" border=0 align=center src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878054.gif" width=28 onload=javascript:resizepic(this) height=44><SPAN lang=EN-US><SUB></SUB><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN></SPAN><FONT face=宋体><SPAN lang=EN-US>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：</SPAN><?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:chmetcnv w:st="on" UnitName="m" SourceValue="2" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>2m</SPAN></st1:chmetcnv></FONT><SPAN style="FONT-FAMILY: 宋体">－<SPAN lang=EN-US><SUB></SUB><SPAN style="mso-spacerun: yes">&nbsp;<IMG onmousewheel="return bbimg(this)" border=0 align=center src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878053.gif" width=20 onload=javascript:resizepic(this) height=44>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN></SPAN><FONT face=宋体><SPAN lang=EN-US>D</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：</SPAN><SPAN lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">（</SPAN><SPAN lang=EN-US>m</SPAN></FONT><SPAN style="FONT-FAMILY: 宋体">－<IMG onmousewheel="return bbimg(this)" border=0 align=center src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878053.gif" width=20 onload=javascript:resizepic(this) height=44><SPAN lang=EN-US><SUB></SUB></SPAN>）</SPAN></P>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>15</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，有一种用来测量绳中张力的仪表，图中</SPAN><SPAN lang=EN-US>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">为夹在绳上夹子的横截面。测量时，只要如图所示那样用一硬杆竖直向上作用在绳上的某点</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，使绳产生一个微小偏移量</SPAN><SPAN lang=EN-US>a</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，借助仪表很容易测出这时绳对硬杆的压力</SPAN><SPAN lang=EN-US>F</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">。现测得该微小偏移量为</SPAN><SPAN lang=EN-US>a=<st1:chmetcnv w:st="on" UnitName="mm" SourceValue="3" HasSpace="False" Negative="False" NumberType="1" TCSC="0">3mm</st1:chmetcnv></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，</SPAN><SPAN lang=EN-US>BC</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">间的距离为</SPAN><st1:chmetcnv w:st="on" UnitName="l" SourceValue="2" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>2L</SPAN></st1:chmetcnv><SPAN lang=EN-US>=<st1:chmetcnv w:st="on" UnitName="mm" SourceValue="400" HasSpace="False" Negative="False" NumberType="1" TCSC="0">400mm</st1:chmetcnv></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，绳对横杆的压力为</SPAN><SPAN lang=EN-US>F=150N</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，则绳中的张力</SPAN><SPAN lang=EN-US>T</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">约为</SPAN></FONT></P>
<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：</SPAN><SPAN lang=EN-US>5</SPAN><SPAN style="FONT-FAMILY: 宋体">×</SPAN><SPAN lang=EN-US>10<SUP>3</SUP>N<SPAN style="mso-spacerun: yes">&nbsp; </SPAN>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：</SPAN><SPAN lang=EN-US>1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>0</SPAN><SPAN style="FONT-FAMILY: 宋体">×</SPAN><SPAN lang=EN-US>10<SUP>4</SUP>N<SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：</SPAN><SPAN lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>5</SPAN><SPAN style="FONT-FAMILY: 宋体">×</SPAN><SPAN lang=EN-US>10<SUP>3</SUP>N<SPAN style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN>D</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：</SPAN><SPAN lang=EN-US>1</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、</SPAN><SPAN lang=EN-US>5</SPAN><SPAN style="FONT-FAMILY: 宋体">×</SPAN><SPAN lang=EN-US>10<SUP>4</SUP>N</SPAN></FONT></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878055.jpg" width=191 onload=javascript:resizepic(this) height=91></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>16</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，用一机械将一批货箱吊上离地</SPAN><st1:chmetcnv w:st="on" UnitName="m" SourceValue="12" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>12m</SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">高的平台，每个货箱的质量为</SPAN><st1:chmetcnv w:st="on" UnitName="kg" SourceValue="5" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>5kg</SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，这个机械在吊箱子时所能提供的功率，取决于所吊物体质量的多少，如图所示。（每次吊起货箱匀速上升，</SPAN><SPAN lang=EN-US>g</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">取</SPAN><st1:chmetcnv w:st="on" UnitName="m" SourceValue="10" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>10m</SPAN></st1:chmetcnv><SPAN lang=EN-US>/s<SUP>2</SUP></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">）根据图线，下列结论正确的是</SPAN></FONT></P>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：货箱匀速上升的最大速度为</SPAN><st1:chmetcnv w:st="on" UnitName="m" SourceValue="0.5" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>0.5m</SPAN></st1:chmetcnv><SPAN lang=EN-US>/s</SPAN></FONT></P>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：将货箱吊上平台，一次所需时间至少为</SPAN><SPAN lang=EN-US>72s</SPAN></FONT></P>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：每次吊起的货箱越少，上升速度越大</SPAN></FONT></P>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>D</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：一次吊起</SPAN><SPAN lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">个货箱时，上升速度最大</SPAN></FONT></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878056.jpg" width=151 onload=javascript:resizepic(this) height=142></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><SPAN lang=EN-US><o:p><FONT face=宋体>&nbsp;</FONT></o:p></SPAN></P>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>17</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，公路巡警开车在高速公路上以</SPAN><st1:chmetcnv w:st="on" UnitName="km/h" SourceValue="100" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>100Km/h</SPAN></st1:chmetcnv><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的恒定车速巡查，巡警车向前方同一车道行驶的一辆轿车发出如图中实线所示的超声波，如果该超声波被那辆轿车反射回来时，巡警车接收到的超声波如图中虚线所示。由此可知，那辆轿车的车速是</SPAN></FONT></P>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：大于</SPAN><st1:chmetcnv w:st="on" UnitName="km/h" SourceValue="100" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>100Km/h</SPAN></st1:chmetcnv><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：小于</SPAN><st1:chmetcnv w:st="on" UnitName="km/h" SourceValue="100" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>100Km/h</SPAN></st1:chmetcnv><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN></FONT></P>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：等于</SPAN><st1:chmetcnv w:st="on" UnitName="km/h" SourceValue="100" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>100Km/h</SPAN></st1:chmetcnv><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN>D</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：大于</SPAN><st1:chmetcnv w:st="on" UnitName="km/h" SourceValue="150" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>150Km/h</SPAN></st1:chmetcnv></FONT></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878057.jpg" width=216 onload=javascript:resizepic(this) height=119></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>18</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，如图所示，半径为</SPAN><SPAN lang=EN-US>R</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的光滑圆弧轨道处在匀强磁场中，磁场方向垂直纸面（纸面为竖直平面）向里。两个质量为</SPAN><SPAN lang=EN-US>m</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">、带电量均为</SPAN><SPAN lang=EN-US>q</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">的正电荷小球，分别从距圆弧最低点</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">高度为</SPAN><SPAN lang=EN-US>h</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">处，同时静止释放后沿轨道运动。下列说法正确的是</SPAN></FONT></P>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：两球可能在轨道最低点</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">点左侧相遇</SPAN></FONT></P>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>B</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：两球可能在轨道最低点</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">点相遇</SPAN></FONT></P>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>C</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：两球可能在轨道最低点</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">点右侧相遇</SPAN></FONT></P>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>D</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">：两球一定在轨道最低点</SPAN><SPAN lang=EN-US>A</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">点左侧相遇</SPAN></FONT></P><SPAN lang=EN-US>
<P style="TEXT-ALIGN: center; TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal align=center><IMG onmousewheel="return bbimg(this)" border=0 src="http://blog.stnn.cc/UpLoadFile/2011/02/1004878058.jpg" width=240 onload=javascript:resizepic(this) height=134></P>
<P style="TEXT-ALIGN: center; TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal align=center>&nbsp;</P></SPAN>
<P style="TEXT-INDENT: 17.95pt; MARGIN: 0cm 0cm 0pt; mso-char-indent-count: 1.71" class=MsoNormal><FONT face=宋体><SPAN lang=EN-US>19</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">，</SPAN><st1:chsdate w:st="on" Year="201
