题目内容
甲、乙两名溜冰运动员,M甲=80kg,M乙=40kg,面对面拉着弹簧秤做圆周运动的溜冰表演,如图所示。两人相距0.9m,弹簧秤的示数为9.2N,下列判断中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241334429777481.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241334429777481.png)
A.两人的线速度相同,约为40m/s |
B.两人的角速度相同,为5rad/s |
C.两人的运动半径相同,都是0.45m |
D.两人的运动半径不同,甲为0.3m,乙为0.6m |
BD
面对面拉着弹簧秤做圆周运动,角速度相等,
,
,得
,得两人的运动半径不同,甲为0.3m,乙为0.6m,
,得
。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133443039619.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133443102758.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133443148807.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133443351732.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241334433981228.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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