题目内容
质量分别为m1和m2的两个小球叠放在一起,从高度为h处自由落下,如图所示。已知h远大于两球半径,所有的碰撞都是完全弹性碰撞,且都发生在竖直方向上。若碰撞后m2恰处于平衡状态,求
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250021278731842.png)
(i)两个小球的质量之比m1:m2;
(ii)小球m1上升的最大高度。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250021278731842.png)
(i)两个小球的质量之比m1:m2;
(ii)小球m1上升的最大高度。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127889468.png)
试题分析:下降过程为自由落体运动,触地时两球速度相同,V=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127905533.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127905386.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127920362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127905386.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127920362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127967298.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127905386.png)
选向上方向为正方向,则:(
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127905386.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127920362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127920362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127967298.png)
由能量守恒定律得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002128061338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127905386.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127920362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002128092328.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002128061338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127920362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002128139361.png)
联立解得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127920362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127905386.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127967298.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002127905533.png)
反弹后高度为:H=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002128139361.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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