ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬×ã¹»³¤µÄˮƽµ¼Ìå¿ò¼ÜµÄ¿í¶ÈL="0.5" m£¬µç×èºöÂÔ²»¼Æ£¬¶¨Öµµç×èR=2¦¸¡£´Å¸ÐӦǿ¶ÈB="0.8" TµÄÔÈÇ¿´Å³¡·½Ïò´¹Ö±ÓÚµ¼Ìå¿òƽÃ棬һ¸ùÖÊÁ¿Îªm="0.2" kg¡¢ÓÐЧµç×èr=2¦¸µÄµ¼Ìå°ôMN´¹Ö±¿ç·ÅÔÚ¿ò¼ÜÉÏ£¬¸Ãµ¼Ìå°ôÓë¿ò¼Ü¼äµÄ¶¯Ä¦²ÁÒòÊý¦Ì=0.5£¬µ¼Ìå°ôÔÚˮƽºãÁ¦F
=1.2NµÄ×÷ÓÃÏÂÓɾ²Ö¹¿ªÊ¼ÑØ¿ò¼ÜÔ˶¯µ½¸Õ¿ªÊ¼ÔÈËÙÔ˶¯Ê±£¬Í¨¹ýµ¼Ìå°ô½ØÃæµÄµçÁ¿¹²Îªq="2" C£¬Çó£º
£¨1£©µ¼Ìå°ô×öÔÈËÙÔ˶¯Ê±µÄËٶȣ»
£¨2£©µ¼Ìå°ô´Ó¿ªÊ¼Ô˶¯µ½¸Õ¿ªÊ¼ÔÈËÙÔ˶¯ÕâÒ»¹ý³ÌÖУ¬µ¼Ìå°ô²úÉúµÄµçÈÈ¡££¨gÈ¡10 m/s2£©![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082411501254616481.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082411501253072.gif)
£¨1£©µ¼Ìå°ô×öÔÈËÙÔ˶¯Ê±µÄËٶȣ»
£¨2£©µ¼Ìå°ô´Ó¿ªÊ¼Ô˶¯µ½¸Õ¿ªÊ¼ÔÈËÙÔ˶¯ÕâÒ»¹ý³ÌÖУ¬µ¼Ìå°ô²úÉúµÄµçÈÈ¡££¨gÈ¡10 m/s2£©
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082411501254616481.jpg)
£¨1£©5 m/s
£¨2£©0.75J
£¨2£©0.75J
£¨1£©µ±ÎïÌ忪ʼ×öÔÈËÙÔ˶¯Ê±£¬ÓУº
£¬
ÓÖ£º![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012577783.gif)
½âµÃ£º
m/s¡£
£¨2£©ÉèÔڴ˹ý³ÌÖÐMNÔ˶¯µÄλÒÆΪx£¬Ôò
£¬½âµÃ£º
m¡£
Éè¿Ë·þ°²ÅàÁ¦×öµÄ¹¦ÎªW£¬Ôò£º
£¬½âµÃ£ºW=1.5J¡£
ËùÒԵ緲úÉúµÄ×ܵçÈÈΪ1.5J£¬µ¼Ìå°ô²úÉúµÄµçÈÈΪ0.75J¡£
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012561544.gif)
ÓÖ£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012577783.gif)
½âµÃ£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012577222.gif)
£¨2£©ÉèÔڴ˹ý³ÌÖÐMNÔ˶¯µÄλÒÆΪx£¬Ôò
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012593673.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012608651.gif)
Éè¿Ë·þ°²ÅàÁ¦×öµÄ¹¦ÎªW£¬Ôò£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115012624721.gif)
ËùÒԵ緲úÉúµÄ×ܵçÈÈΪ1.5J£¬µ¼Ìå°ô²úÉúµÄµçÈÈΪ0.75J¡£
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿