题目内容
如图所示,在半径为R的四分之一光滑圆弧轨道的顶端a点,质量为m的物块(可视为质点)由静止开始下滑,经圆弧最低点b滑上粗糙水平面,圆弧轨道在b点与水平轨道平滑相接,物块最终滑至c点停止。若物块与水平面问的动摩擦因数为μ,下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026028082764.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026028082764.png)
A.物块滑到b点时的速度为![]() |
B.物块滑到b点时对b点的压力是2mg |
C.c点与b点的距离为![]() |
D.整个过程中物块机械能损失了mgR |
CD
试题分析:物块从a点到b点的过程中,机械能守恒,故有
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002602871828.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002602886637.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002602902944.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002602918656.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002602949953.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002602964517.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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