题目内容
如图所示,O1为皮带的主动轮的轴心,轮半径为r1,O2为从动轮的轴心,轮半径为r2,r3为固定在从动轮上的小轮半径。已知r2=2r1,r3="1.5r1" .A、B和C分别是3个轮边缘上的点,质点A、B、C的向心加速度之比是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241916043787233.jpg)
A.1:2:3 B.8:4:3 C.3:6:2 D.2:4:3
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241916043787233.jpg)
A.1:2:3 B.8:4:3 C.3:6:2 D.2:4:3
B
试题分析:对于A与B,由于皮带不打滑,线速度大小相等,即
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191604393473.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191604690458.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191604986796.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191605220502.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191605516748.png)
根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191605782532.png)
故选B
点评:本题运用比例法解决物理问题的能力,关键抓住相等的量:对于不打滑皮带传动的两个轮子边缘上各点的线速度大小相等;同一轮上各点的角速度相同.
![](http://thumb2018.1010pic.com/images/loading.gif)
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