题目内容
用长为l的细线一端栓一小球,另一端绕固定悬点O在水平面内做匀速圆周运动形成“圆锥摆”。现有三个摆绕同一悬点在同一水平面内运动,三个摆球质量相等,如图所示,则:( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025127013634.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025127013634.jpg)
A.三球运动的线速度相等 |
B.三球运动的角速度相等 |
C.三球运动的加速度相等 |
D.三个摆线拉力大小相等 |
B
试题分析:小球受到的重力和绳子的拉力的合力充当向心力,所以向心力
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002512732700.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002512748297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002512763503.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002512779754.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002512795619.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002512810454.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002512841751.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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