题目内容
如图所示,有一固定的且内壁光滑的半球面,球心为O,最低点为C,在其内壁上有两个质量均为m的小球(可视为质点)A和B,在两个高度不同的水平面内做匀速圆周运动,A球的轨迹平面高于B球的轨迹平面,A、B两球与O点的连线与竖直线OC间的夹角分别为α=53°和β=37°,以最低点C所在的水平面为重力势能的参考平面,则(sin37°=
,cos37°=
)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041418214299.png)
A.A、B两球运动的角速度之比为4:3
B.A、B两球的动能之比为64:27
C.A、B两球所受支持力的大小之比为4:3
D.A、B两球的机械能之比为112:51
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004141790371.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004141805350.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041418214299.png)
A.A、B两球运动的角速度之比为4:3
B.A、B两球的动能之比为64:27
C.A、B两球所受支持力的大小之比为4:3
D.A、B两球的机械能之比为112:51
BCD
试题分析:对A受力分析,受重力mg和弹力N,可得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004141836767.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004141852955.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004141868829.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004141868838.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041418831256.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041418991475.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004141914470.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041419301269.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041419462005.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041419612464.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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