ÌâÄ¿ÄÚÈÝ
¡°¿¹Õð¾ÈÔÖ£¬ÖÚÖ¾³É³Ç¡±£¬2008Äê5ÔÂ15Èճɶ¼¾üÇøÏòãë´¨µÈÔÖÇø¿ÕͶ°üÀ¨5Íò·Ý¸ÉÁ¸¡¢2.5ÍòË«¾üÓýºÐ¬¡¢0.5Íò´²ÃÞ±»ÔÚÄڵľÈÔÖÎï×Ê£®Ö±Éý·É»úÑØˮƽ·½ÏòÔÈËÙ·ÉÍù¾ÈÔÖÎï×ʼ¯½áµØ£®Í¼Ê¾ÎªÐü¹Ò×Åm=500kg¿ÕÏäµÄÐüË÷ÓëÊúÖ±·½ÏòµÄ¼Ð½Ç¦È1=45º£»¶øÖ±Éý»úÔØÉϾÈÔÖÎï×Ê·ÉÍùÔÖÇøʱ£¬¼ÓËÙ¶ÈÑØˮƽ·½Ïò£¬´óСÎȶ¨ÔÚa=1.5m/s2£¬ÐüË÷ÓëÊúÖ±·½ÏòµÄ¼Ð½Ç¦È2=14º£®Èô¿ÕÆø×èÁ¦´óС²»±ä£¬ÇÒºöÂÔÐüË÷µÄÖÊÁ¿£®£¨ÖØÁ¦¼ÓËÙ¶Èg=10m/s2£¬tan14 º=0.25£©
ÊÔÇó£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413051359115431.png)
СÌâ1:¿ÕÆø×èÁ¦µÄ´óС£»
СÌâ2:ÏäÖоÈÔÖÎï×ʵÄÖÊÁ¿£®
ÊÔÇó£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413051359115431.png)
СÌâ1:¿ÕÆø×èÁ¦µÄ´óС£»
СÌâ2:ÏäÖоÈÔÖÎï×ʵÄÖÊÁ¿£®
СÌâ1:5.0¡Á103N
СÌâ2:M=4.5¡Á103kg
£¨1£©Ö±Éý·É»úÔÈËÙ·ÉÐÐʱ£¬¿ÕÏäÊÜÁ¦Æ½ºâ£¬ÉèÐüË÷µÄÀÁ¦ÎªT1£¬¿ÕÆø×èÁ¦Îªf£¬
ˮƽ·½Ïò£ºT1sin¦È1=f £¨1£©£¨3·Ö£©
ÊúÖ±·½Ïò£ºT1cos¦È1=mg £¨2£©£¨3·Ö£©
f=mgtan¦È1=5.0¡Á103N £¨3£©£¨2·Ö£©
£¨2£©Ö±Éý»ú×°ÉϾÈÔÖÎï×ʺó£¬ÉèÏäÄÚ¾ÈÔÖÎï×ÊÖÊÁ¿ÎªM£¬ÐüË÷µÄÀÁ¦ÎªT2
ˮƽ·½Ïò£ºT2sin¦È2- f =(M+m)a £¨4£©£¨3·Ö£©
ÊúÖ±·½Ïò£ºT2cos¦È2=(M+m)g £¨5£©£¨3·Ö£©
M=4.5¡Á103kg £¨6£©£¨2·Ö£©
ˮƽ·½Ïò£ºT1sin¦È1=f £¨1£©£¨3·Ö£©
ÊúÖ±·½Ïò£ºT1cos¦È1=mg £¨2£©£¨3·Ö£©
f=mgtan¦È1=5.0¡Á103N £¨3£©£¨2·Ö£©
£¨2£©Ö±Éý»ú×°ÉϾÈÔÖÎï×ʺó£¬ÉèÏäÄÚ¾ÈÔÖÎï×ÊÖÊÁ¿ÎªM£¬ÐüË÷µÄÀÁ¦ÎªT2
ˮƽ·½Ïò£ºT2sin¦È2- f =(M+m)a £¨4£©£¨3·Ö£©
ÊúÖ±·½Ïò£ºT2cos¦È2=(M+m)g £¨5£©£¨3·Ö£©
M=4.5¡Á103kg £¨6£©£¨2·Ö£©
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿