题目内容
矩形滑块由不同材料的上下两层粘结在一起组成,将其放在光滑的水平面上,如图所示。质量为m的子弹以速度v水平射向滑块,若射击上层,则子弹恰好不射出;若射击下层,则子弹整个儿恰好嵌入,则上述两种情况相比较( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242024392902893.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242024392902893.png)
A.两次子弹对滑块做的功一样多 |
B.两次滑块所受冲量一样大 |
C.子弹嵌入下层过程中,系统产生的热量较多 |
D.子弹击中上层过程中,系统产生的热量较多 |
AB
试题分析:考查依题意,设滑块的质量为M,对于子弹和滑块组成的系统,由动量守恒定律:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202440382760.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202441521739.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202441521739.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202443284968.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202444360308.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202445468570.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202444360308.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242024476991183.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202444360308.png)
点评:本题难度较小,注意灵活选择研究对象,产生的热量Q只与相对位移有关
![](http://thumb2018.1010pic.com/images/loading.gif)
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