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<HTML><HEAD><TITLE>new</TITLE><META content="text/html; charset=gb2312" http-equiv=Content-Type><LINK href="text.css" rel=stylesheet type=text/css><META content="Microsoft FrontPage 4.0" name=GENERATOR></HEAD><body leftmargin="15"><center><b><br>3 刚体定轴转动微分方程</b></center> <table border="0" cellpadding="0" cellspacing="0" width="560"> <tr> <td>即物理中的<font color="#0000FF">角动量定理</font>。</td> </tr> <tr> <td> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td width="50%"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td><img border="0" src="pic1/3053_348.GIF" width="123" height="29"></td> <td> 或 </td> <td><img border="0" src="pic1/3053_349.GIF" width="126" height="29"></td> </tr> </table> </td> <td width="50%" rowspan="7"> <p align="center"><img border="0" src="pic1/3053_350.GIF" width="152" height="234"></td> </tr> <tr> <td width="50%">小例：均质圆轮重Q，半径为r，其上作用一常力偶M，重物重P。求重物的加速度。</td> </tr> <tr> <td width="50%">解：研究整体。画受力图和运动图。</td> </tr> <tr> <td width="50%"><img border="0" src="pic1/3053_351.GIF" width="338" height="32"></td> </tr> <tr> <td width="50%">其中：</td> </tr> <tr> <td width="50%"><img border="0" src="pic1/3053_352.GIF" width="247" height="55"></td> </tr> <tr> <td width="50%"><img border="0" src="pic1/3053_353.GIF" width="162" height="31"></td> </tr> </table> </td> </tr> <tr> <td>代入(1)</td> </tr> <tr> <td> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td><img border="0" src="pic1/3053_354.GIF" width="127" height="72"></td> <td> 对吗？</td> </tr> </table> </td> </tr> <tr> <td> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td>所以： </td> <td><img border="0" src="pic1/3053_355.GIF" width="157" height="72"></td> <td> <table border="1" cellpadding="0" cellspacing="0" bordercolor="#008080" bgcolor="#00FF00"> <tr> <td>答案对，解题错！为什么？</td> </tr> </table> </td> </tr> </table> </td> </tr> <tr> <td> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td width="50%">例4（P213 例5-19）</td> <td width="50%" rowspan="2"> <p align="center"><img border="0" src="pic1/3053_356.GIF" width="235" height="106"></td> </tr> <tr> <td width="50%">均质细杆AB长l，重W，如图。<br> 今突然剪断B端的绳子，求绳子剪断前后铰链A的约束力的改变量 。</td> </tr> </table> </td> </tr> <tr> <td></td> </tr> <tr> <td> <p align="center"> <a href="3053_2.htm"><font color="#FF6666">[ 上一节 ]</font></a> <a href="3053_4.htm"><font color="#00CC00">[ 下一节 ]</font></a> </td> </tr> </table> </BODY></HTML> ⌨️ 快捷键说明
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