题目内容
如图所示,甲、乙两水平圆盘紧靠在一起,大圆盘为主动轮,乙靠摩擦随甲无滑动地转动。大、小圆盘的半径之比为3∶1,两圆盘和小物体m1、m2间的动摩擦因数相同。m1距甲盘圆心O点2r,m2距乙盘圆心O′点r,当甲缓慢转动且转速慢慢增加时
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012556622127.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012556622127.png)
A.物块相对盘开始滑动前,m1与m2的角速度之比为3∶1 |
B.物块相对盘开始滑动前,m1与m2的向心加速度之比为2∶9 |
C.随转速慢慢增加,m1先开始滑动 |
D.随转速慢慢增加,m2先开始滑动 |
BD
试题分析:据题意,大小圆盘接触部分线速度相等,即:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001255771415.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001255803570.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001255818752.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001255834952.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001255912594.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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