题目内容
如图所示,A、B是两个靠摩擦传动且接触面没有相对滑动的靠背轮,A是主动轮,B是从动轮,它们的半径RA=2RB, a 和b 两点在轮的边缘,cd分别是AB两轮半径的中点,下列判断正确的有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241356194172171.jpg)
A.va =" 2" vb
B.ωb = 2ωa
C.v c = va
D.ac =ad
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241356194172171.jpg)
A.va =" 2" vb
B.ωb = 2ωa
C.v c = va
D.ac =ad
B
本题考查的是圆周运动的线速度和角速度的问题,A、B是两个靠摩擦传动且接触面没有相对滑动的靠背轮,两个边缘具有相同的线速度,
,
,
,则ωb = 2ωa
B正确;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135619433454.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135619511695.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135619542478.png)
B正确;
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目