ÌâÄ¿ÄÚÈÝ
¶¯ÎïÔ°µÄˮƽµØÃæÉÏ·Å×ÅÒ»¸öÖÊÁ¿ÎªMµÄÁý×Ó£¬ÁýÄÚÓÐÒ»Ö»ÖÊÁ¿ÎªmµÄºï×Ó¡£µ±ºï×ÓÒÔijһ¼ÓËÙ¶ÈÑØÊúÖ±Öù×Ó¼ÓËÙÏòÉÏÅÀʱ£¬Áý×Ó¶ÔµØÃæµÄѹÁ¦ÎªF1£»µ±ºï×ÓÒÔͬÑù´óСµÄ¼ÓËÙ¶ÈÑØÊúÖ±Öù×Ó¼ÓËÙÏ»¬Ê±£¬Áý×Ó¶ÔµØÃæµÄѹÁ¦ÎªF2£¬ÈçͼËùʾ¡£¹ØÓÚF1ºÍF2µÄ´óС£¬ÏÂÁйØϵÖÐÕýÈ·µÄÊÇ £¨ £©
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241546054841358.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241546054841358.png)
A£®F 1£¾(M+m)g£¬F2£¼(M+m)g | B£®F 1=F2£¾(M+m)g |
C£®F 1£¾F2£¾(M+m)g | D£®F 1£¼(M+m)g£¬F2£¾(M+m)g |
A
ÊÔÌâ·ÖÎö£º
ºï×Ó¼ÓËÙÉÏÅÀʱ£¬ºï×ÓÊܵ½ÏòϵÄÖØÁ¦ºÍÏòÉϵÄĦ²ÁÁ¦f£¬ÇÒf>G,ÓÉÅ£¶ÙµÚÈý¶¨ÂɿɵÃÁý×ÓÊܵ½ÏòϵÄĦ²ÁÁ¦£¬ËùÒÔÁý×Ó¶ÔµØÃæµÄѹÁ¦
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154605593689.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154605718899.png)
ÒòΪºï×ÓÔÚ¼ÓËÙÏ»¬£¬ËùÒÔ¶Ôºï×Ó·ÖÎöÓУººï×ÓÊܵ½ÏòϵÄÖØÁ¦GºÍÏòÉϵÄĦ²ÁÁ¦f£¬ÇÒÖØÁ¦G£¾f£¬ÓÉÅ£¶ÙµÚÈý¶¨ÂÉ¿ÉÖªÁý×ÓÊܵ½ÏòϵÄĦ²ÁÁ¦£¨ÒòΪÁý×Ó¸øºï×ÓÏòÉϵÄĦ²ÁÁ¦£¬ËùÒÔºï×Ӿ͸øÁý×ÓÏòϵÄĦ²ÁÁ¦£©£¬ËùÒÔÁý×Ó¸øµØÃæµÄѹÁ¦Îª
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154605796710.png)
ÒòΪf£¼G ËùÒÔ
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154605874934.png)
¹ÊÑ¡A
µãÆÀ£º´ËÌâÄ¿ÊÇÊÜÁ¦·ÖÎöµÄÌ⣬ÐèҪѧÉúÏȶÔÎïÌå½øÐÐÊÜÁ¦·ÖÎö£¬È»ºóÀûÓÃËùѧ֪ʶÁé»îÓ¦Óã®
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿