题目内容
(理)如图所示的皮带传动装置中,O为轮子A和B的共同转轴,O′为轮子C的转轴,A、B、C分别是三个轮子边缘上的质点,且RA=RC=2RB,则三质点的向心加速度大小之比aA∶aB∶aC等于
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241713024601800.png)
A.4∶2∶1
B.2∶1∶2
C.1∶2∶4
D.4∶1∶4
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241713024601800.png)
A.4∶2∶1
B.2∶1∶2
C.1∶2∶4
D.4∶1∶4
A
试题分析:根据题意设a的半径为2,则C的半径为2,B的半径为1,根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171302850432.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171303287498.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171303661651.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171304020598.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171304254699.png)
点评:本题考查了向心加速度的计算,包括线速度、角速度的计算。
![](http://thumb2018.1010pic.com/images/loading.gif)
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