ÌâÄ¿ÄÚÈÝ
£¨12·Ö£©ÈçͼËùʾ£¬Çã½ÇΪ370µÄ´Ö²ÚбÃæµÄµ×¶ËÓÐÒ»¸öÖÊÁ¿Îª1kgµÄ°¼ÐÎС»¬¿é£¬ÓëбÃæ¼äµÄ¶¯Ä¦²ÁÒòÊýΪ0.25£¬ÏÖС»¬¿éÒÔijһ³õËÙ¶È
´ÓбÃæµÄµ×¶ËÉÏ»¬£¬Í¬Ê±ÔÚбÃæµ×¶ËÕýÉÏ·½ÓÐһСÇòÒÔ
ˮƽÅ׳ö£¬¾¹ýt=0.4s,СÇòÇ¡ºÃ´¹Ö±Ð±Ãæ·½ÏòÂäÈë°¼²Û£¬´Ëʱ£¬Ð¡»¬¿é»¹ÔÚÉÏ»¬¹ý³ÌÖС££¨ÒÑÖªsin37¡ã£½0.6£¬cos37¡ã£½0.8£©£¬gÈ¡10m/s2Çó£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025308134352.png)
£¨1£©Ð¡ÇòÒÔˮƽÅ׳öµÄ![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002530719361.png)
£¨2£©Ð¡»¬¿éµÄ³õËÙ¶È![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002530703301.png)
£¨3£©0.4sǰС»¬¿éËðʧµÄ»úеÄÜ![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002530906407.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002530703301.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002530719361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025308134352.png)
£¨1£©Ð¡ÇòÒÔˮƽÅ׳öµÄ
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002530719361.png)
£¨2£©Ð¡»¬¿éµÄ³õËÙ¶È
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002530703301.png)
£¨3£©0.4sǰС»¬¿éËðʧµÄ»úеÄÜ
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002530906407.png)
(1) 3m/s (2) 5.35m/s (3) 3J
ÊÔÌâ·ÖÎö£º£¨1£©¾ÝƽÅ×Ô˶¯¹æÂÉ¿É֪СÇòÓëбÃæ´¹Ö±ÏàÅöʱµÄÊúÖ±·ÖËÙ¶ÈΪ£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002530937920.png)
ÔÙ¾Ý×ÔÓÉÂäÌåÔ˶¯¹æÂÉÓУº
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002531187501.png)
ÔòСÇòƽÅ×Ô˶¯µÄ³õËÙ¶ÈΪ£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002531203614.png)
£¨2£©°¼²ÛÏòÉÏÔ˶¯¹ý³ÌÖеļÓËÙ¶ÈΪ£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025312181646.png)
°¼²ÛÏòÉÏ×öÔȼõËÙÖ±ÏßÔ˶¯,¾ÝÔȼõËÙÖ±ÏßÔ˶¯¹æÂɵÃ:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002531234754.png)
¶ø°¼²ÛÔ˶¯µÄλÒÆÓëСÇòµÄˮƽλÒƼäµÄ¹ØϵΪ:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025312491113.png)
´úÈëÊý¾ÝÇóµÃ°¼²ÛÉÏ»¬µÄ³õËÙ¶ÈΪ:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002531327715.png)
£¨3£©0.4sÇ°°¼²ÛËðʧµÄ»úеÄܵÈÓÚĦ²ÁÁ¦×öµÄ¹¦£¬¼´£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025313431169.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿