题目内容
如图所示,小物块位于半径为
的半球顶端,若此时小球的初速为
时,物块对球顶恰无压力,则以下说法不正确的是:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026385172098.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002638501303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002638501323.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026385172098.jpg)
A.物块立即离开球面做平抛运动,不再沿圆弧下滑 |
B.![]() |
C.物块落地点离球顶水平位移![]() |
D.物块落地速度方向和水平地面成![]() |
D
试题分析:物块对球顶恰无压力,说明此时恰好是物体的重力作为圆周运动的向心力,物体离开半球顶端后将做平抛运动,则选项A说法正确.由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002638579736.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002638532555.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002638610492.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002638626641.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002638642515.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002638657658.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002638673741.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026387201212.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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