题目内容
如图4所示,光滑半球形容器固定在水平面上,O为球心.一质量为m的小滑块,在水平力F的作用下静止于P点.设滑块所受支持力为FN,OP与水平方向的夹角为θ.下列关系正确的是 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241414205932190.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241414205932190.jpg)
A.F=![]() | B.F=mgtanθ |
C.FN=![]() | D.FN=mgtanθ |
A
滑块受力如图,由平衡条件知:
=cotθ?F=mgcotθ=
,
FN=
.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141420795528.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141420624637.png)
FN=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141420983630.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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