题目内容
如图,固定半球面由两种材料做成,球右侧是光滑的,而左侧是粗糙的,O点为其球心,A、B为两个完全相同的小物块(可视为质点),小物块A静止在球面的左侧,小物块B在水平力F作用下静止在球的右侧,两球处在同一高度,两小物块与球心连线和水平方向的夹角均为q,则左右两物块对斜面的压力大小之比为 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250000571401157.png)
A.sin2q:1 B.cos2q:1 C.sinq:1 D.cosq:1
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250000571401157.png)
A.sin2q:1 B.cos2q:1 C.sinq:1 D.cosq:1
A
试题分析:对AB受力分析如下图
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250000571728825.jpg)
A球沿切线方向摩擦力和重力沿切线的分力平衡,垂直切线方向
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000057187703.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000057203712.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250000572182712.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000057234777.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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