题目内容
如图所示皮带传动装置,皮带轮O和O′上的三点A、B和C,OA=O′C=r,O′B=2r.则皮带轮转动时A、B、C三点的情况是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241859022953910.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241859022953910.jpg)
A.vA=vB,vB>vC | B.ωA=ωB,vB>vC |
C.vA=vB,ωB=ωC | D.ωA>ωB,vB=vC |
AC
试题分析:因为AB同一条传送带传动的轮子边缘上的点,所以
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185902326463.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185902701492.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185902919456.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185903231470.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185903527513.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185903746522.png)
故选AC.
点评:解决本题的关键知道靠传送带传动的轮子边缘上的点具有相同的线速度,共轴转动的点具有相同的角速度.
![](http://thumb2018.1010pic.com/images/loading.gif)
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