ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬×ÜÖÊÁ¿Îª460kgµÄÈÈÆøÇò£¬´ÓµØÃæ¸Õ¿ªÊ¼ÊúÖ±ÉÏÉýʱµÄ¼ÓËÙ¶ÈΪ0.5m/s2£¬µ±ÈÈÆøÇòÉÏÉýµ½180mʱ£¬ÒÔ5m/sµÄËÙ¶ÈÏòÉÏÔÈËÙÔ˶¯.ÈôÀ뿪µØÃæºóÈÈÆøÇòËùÊܸ¡Á¦±£³Ö²»±ä£¬ÉÏÉý¹ý³ÌÖÐÈÈÆøÇò×ÜÖÊÁ¿²»±ä£¬ËùÊÜ¿ÕÆø×èÁ¦ÓëËٶȳÉÕý±È£¬ÖØÁ¦¼ÓËÙ¶Èg=10m/s2 .¹ØÓÚÈÈÆøÇò£¬ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨ £©
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003902810334.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003902810334.png)
A£®ËùÊܸ¡Á¦´óСΪ4830N |
B£®¼ÓËÙÉÏÉý¹ý³ÌÖÐÈÈÆøÇò´¦ÓÚÍêȫʧÖØ״̬ |
C£®´ÓµØÃ濪ʼÉÏÉý10sºóµÄËٶȴóСΪ5m/s |
D£®ÒÔ5m/sÔÈËÙÉÏÉýʱËùÊÜ¿ÕÆø×èÁ¦´óСΪ200N |
A
ÊÔÌâ·ÖÎö£ºÈÈÆøÇò´ÓµØÃæ¸Õ¿ªÊ¼ÊúÖ±ÉÏÉýʱ£¬ËÙ¶ÈΪÁ㣬¹Ê×èÁ¦ÎªÁ㣬ÆøÇòÊÜÖØÁ¦ºÍ¸¡Á¦£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÓУº
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003902825724.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039028411092.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003902856723.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003902872637.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿