题目内容
如图所示,质量为
和
的两个小球固定在长为
的轻杆两端,
。杆的中点是一水平转轴
,系统可在竖直面内无摩擦转动,空气阻力不计。若从杆处于水平位置由静止释放系统,系统转过
的过程中,以下说法正确的是(重力加速度已知)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241228207111906.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122820617219.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122820633324.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122820649211.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122820664388.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122820680209.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122820695255.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241228207111906.gif)
A.该过程中系统机械能守恒 |
B.球![]() |
C.可以求出杆竖直时两球的速率 |
D.可以求出杆竖直时轴O对杆的作用力大小 |
ACD
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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