题目内容
如图所示 ,一只内壁光滑的半球形碗固定在小车上,小车放在光滑水平面上。在小车正前边的碗边A处无初速度释放一只质量为
的小球。则小球沿碗内壁下滑的过程中,下列说法正确的是(半球形碗的半径为
)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250023361521924.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002336121337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002336137303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250023361521924.png)
A.小球、碗和车组成的系统机械能守恒 |
B.小球的最大速度度等于![]() |
C.小球、碗和车组成的系统动量守恒 |
D.小球不能运动到碗左侧的碗边B点 |
A
试题分析:由于没有摩擦,对于小球、碗和车组成的系统,只有重力对小球做功,系统的机械能守恒.故A正确.设小球滑到最低点时速度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002336184265.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002336277782.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002336293583.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002336168508.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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