题目内容
如图所示,A、B两物块置于绕竖直轴匀速转动的水平圆盘上,两物块始终相对圆盘静止.已知两物块的质量mA< mB,运动半径rA>rB,则下列关系一定正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241705209802216.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241705209802216.jpg)
A.角速度ωA<ωB | B.线速度vA<vB |
C.向心加速度aA>aB | D.向心力FA>FB |
C
试题分析:A、A、B两物块置于同一圆盘上,且相对圆盘静止,具有相同的角速度,所以
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170520996495.png)
B、由于
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170521183454.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170521386475.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170521589471.png)
C、向心加速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170521791517.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170521386475.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170522197487.png)
D、向心力
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170522384625.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170521386475.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824170523320510.png)
故选C
点评:本题中A、B两物体做圆周运动的向心力是由静摩擦力提供的,找到描述圆周运动各物理量之间的关系是解决本题的关键。
![](http://thumb2018.1010pic.com/images/loading.gif)
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