题目内容
“飞车走壁”是一种传统的杂技艺术,演员骑车在倾角很大的桶面上做圆周运动而不掉下来.如图所示,已知桶壁的倾角为
,车和人的总质量为
,做圆周运动的半径为
,若使演员骑车做圆周运动时不受桶壁的摩擦力,下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500243744516034.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002437398297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002437398337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002437414260.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500243744516034.png)
A.桶面对车的弹力为![]() |
B.桶面对车的弹力为![]() |
C.人和车的速度为![]() |
D.人和车的速度为![]() |
C
试题分析:对人和车进行受力分析如图所示.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250024375233357.jpg)
根据直角三角形的边角关系和牛顿第二定律方程:竖直方向平衡,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002437523778.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002437539852.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002437554890.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002437570690.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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