题目内容
如图所示的皮带传动装置中,轮A和B同轴,A、B、C分别是三个轮边缘的质点,且RA=RC=2RB,则下列说法中正确的是( )
A.三质点的角速度之比ωA:ωB:ωc =" 2:2:1"
B.三质点的线速度之比VA:VB:VC =" 2:1:2"
C.三质点的周期之比TA:TB:TC =" 2:2:1"
D.三质点的转速之比nA : nB : nC = 1:1:2
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241640240025333.png)
A.三质点的角速度之比ωA:ωB:ωc =" 2:2:1"
B.三质点的线速度之比VA:VB:VC =" 2:1:2"
C.三质点的周期之比TA:TB:TC =" 2:2:1"
D.三质点的转速之比nA : nB : nC = 1:1:2
A
试题分析:轮A和B同轴,具有相同的角速度,即
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164024298495.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164024688453.png)
A、由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164025062470.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164025499623.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164025842801.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164026014711.png)
B、由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164024298495.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164025062470.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164026576982.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164026794665.png)
C、由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164024298495.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164027590619.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164028011550.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164028276663.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164024688453.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164029196772.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164029399702.png)
D、由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164029571557.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164029805985.png)
故选A
点评:线速度、角速度、周期和转速的关系是:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164029961831.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164030288772.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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