题目内容
(1)铅弹打中木块后二者的速度V(4分)
(2)铅弹打中木块前的速度V0(4分)
(3)铅弹的温度升高多少度?(4分)
(1)V=1m/s(2)200m/s(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115607868398.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115607868398.gif)
(1)铅弹与木块作平抛运动的速度为V,
,V="1m/s" 4分
(2)铅弹打中木块,动量守恒:
,V0="200m/s " 4分
(3)子弹打中木块损失的机械能为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115607914801.gif)
铅弹吸收的热量
,
4分
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115607883492.gif)
(2)铅弹打中木块,动量守恒:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115607899494.gif)
(3)子弹打中木块损失的机械能为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115607914801.gif)
铅弹吸收的热量
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115607930602.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115607868398.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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