题目内容
如图所示是自行车传动结构的示意图,其中Ⅰ是大齿轮,齿数为
,Ⅱ是小齿轮,齿数为
,Ⅲ 是后车轮,半径为R,设脚踏板的转速为n r/s,则以下说法中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241353348376177.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135334743335.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135334790369.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241353348376177.png)
A.自行车前进的速度为![]() |
B.自行车前进的速度为![]() |
C.大齿轮、小齿轮、后车轮的角速度之比为![]() |
D.大齿轮、小齿轮、后车轮的线速度之比为![]() |
BC
因为齿轮与半径成正比,所以
,又因为角速度和半径成反比,所以
,因为后车轮与小齿轮的角速度是相等的,所以大齿轮、小齿轮、后车轮的角速度之比为
,故C正确,又知道
,所以
,故后车轮的线速度即自行车前进的速度为
,B正确。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135335586614.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135335710692.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135335289420.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135336022599.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135336085864.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824135335086771.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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