题目内容
(9分)质量为M="6" kg的木板B静止于光滑水平面上,物块A质量为6 kg,停在B的左端。质量为1 kg的小球用长为0. 8 m的轻绳悬挂在固定点O上,将轻绳拉直至水平位置后,由静止释放小球,小球在最低点与A发生碰撞后反弹,反弹所能达到的最大高度为0.2 m,物块与小球可视为质点,不计空气阻力。已知A、B间的动摩擦因数
,为使A、B达到共同速度前A不滑离木板,木板至少多长?
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009117552924.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000911739420.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009117552924.jpg)
0.25m
试题分析:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000911771785.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000911786851.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000911802832.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000911817892.png)
球与A碰撞过程中,系统动量守恒
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000911833681.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000911849597.png)
物块A与木板B相互作用过程中
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000911864903.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000911880717.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009118951392.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000911911607.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目