题目内容
在竖直平面内有一半径为R的光滑圆环轨道,一质量为m的小球穿在圆环轨道上做圆周运动,到达最高点C时的速率
=
, 则下述正确的是 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006286572018.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000628610314.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000628625592.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006286572018.png)
A.此小球的最大速率是![]() ![]() |
B.小球到达C点时对轨道的压力是![]() |
C.小球沿圆轨道绕行一周所用的时间小于![]() |
D.小球在任一直径两端点上的动能之和相等 |
ACD
试题分析:速度最大的点应该是最低点时,根据动能定理:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006287661004.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000628781951.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000628797904.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000628813705.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000628844655.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000628859742.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000628875768.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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