题目内容
(12分)如图所示,一颗质量为m =10g的子弹以水平速度v0 =200m/s击穿一个静止于光滑水平面上的沙箱后,速度减小为v="100" m/s。已知沙箱的质量为M =0.5kg。求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027183594593.jpg)
(1)沙箱被击穿后的速度
的大小;
(2)这一过程中系统产生的热量Q的大小。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027183594593.jpg)
(1)沙箱被击穿后的速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002718375308.png)
(2)这一过程中系统产生的热量Q的大小。
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002718422530.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002718406547.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002718422530.png)
试题分析:(1)碰撞过程中动量守恒,所以有
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002718437729.png)
解得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002718406547.png)
(2)系统损失的动能全部转化为系统产生的热量,所以
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027184681231.png)
解得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002718422530.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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