题目内容
如图所示,由两种材料做成的半球面固定在水平地面上,球右侧面是光滑的,左侧面粗糙,O点为球心,A、B是两个相同的小物块(可视为质点),物块A静止在左侧面上,物块B在图示水平力F作用下静止在右侧面上,A、B处在同一高度,AO、BO与竖直方向的夹角均为q,则A、B分别对球面的压力大小之比为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014381393150.jpg)
A.sin2q :1 B.sinq :1 C.cos2q :1 D.cosq :1
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014381393150.jpg)
A.sin2q :1 B.sinq :1 C.cos2q :1 D.cosq :1
C
试题分析:分别对A和B受力分析,如图所示:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014381543761.jpg)
对A,由平衡条件得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001438170728.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001438201807.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001438217780.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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