题目内容
如图所示,小球以初速度为v0从光滑斜面底部向上滑,恰能到达最大高度为h的斜面顶部。右图中A是半径大于h的光滑
圆周轨道、B是半径小于h的光滑
圆周轨道、C是内轨直径等于h的光滑圆周轨道,小球均沿其轨道内侧运动。D是长为
h的轻棒、可绕O点做无摩擦转动,小球固定于其下端。小球在底端时的初速度都为v0,则小球在以上四种情况中能到达高度h的有( )![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082416303341624118.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163032495302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163032963336.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163032963336.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082416303341624118.png)
AD
试题分析:小球到达最高点的速度可以为零,根据机械能守恒定律得,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163033728717.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163033884410.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163034227985.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163034539419.png)
点评:小球在运动的过程中机械能守恒,根据机械能守恒定律,以及到达最高点的速度能否为零,判断小球进入右侧轨道能否到达h高度.
![](http://thumb2018.1010pic.com/images/loading.gif)
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