题目内容
质量为m的滑块从半径为R的半球形碗的边缘滑向碗底,过碗底时速度为v,若滑块与碗间的动摩擦因数为μ,则在过碗底时滑块受到摩擦力的大小为( )
A.μmg | B.μm![]() | C.μm(g+![]() | D.μm(![]() |
C
在碗底时,由圆周运动的合外力提供向心力
,摩擦力f=μF=μm(g+
) ,C对;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134000422824.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134000281469.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.μmg | B.μm![]() | C.μm(g+![]() | D.μm(![]() |