题目内容
如图所示,两轮用皮带传动,皮带不打滑,图中有A、B、C三点,这三点所在处的半径
,则以下有关各点线速度v、角速度ω的关系中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250047578285618.png)
A.
B.
C.
D.![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004757891632.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004757813585.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250047578285618.png)
A.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004757844487.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004757859587.png)
C.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004757875615.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004757891632.png)
A
试题分析: 同皮带上的点,线速度大小相等,即vA=vB.除圆心外,同轮轴上的点,角速度相等,ωA=ωC,由v=ωr,即有角速度相等时,半径越大,线速度越大,则得vA>vC.线速度相等时,角速度与半径成反比,则得ωA>ωB.所以
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004757906511.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004757844487.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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