题目内容
如下图所示,将完全相同的两个小球A、B,用长L="0.8" m的细绳悬于以v="4" m/s向右匀速运动的小车顶部,两球与小车前后壁接触,由于某种原因,小车突然停止运动,此时悬线的拉力之比FB∶FA为(g="10" m/s2) ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020338043192.png)
A.1∶1 B.1∶2 C.1∶3 D.1∶4
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020338043192.png)
A.1∶1 B.1∶2 C.1∶3 D.1∶4
C
试题分析:对小球A,在小车刚停止时绕悬点开始做圆周运动,由向心力公式得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002033819842.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002033835634.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002033851564.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002033866604.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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