题目内容
如图所示,细绳的一端固定于O点,另一端系一质量为m的小球,使小球在竖直平面内作圆周运动,周期一定,当小球在最高点时绳的张力为T1,在最低点时,绳的张力为T2,则T1和T2的差值为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241401407001043.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241401407001043.png)
A.2mg | B.4mg | C.6mg | D.8mg |
C
本题考查的是圆周运动中的向心力问题,在最高点
,最高点临界速度:
在最低点
,且满足
则
;答案选C。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140140965830.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140141043533.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140141105839.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241401411681009.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140141261692.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.2mg | B.4mg | C.6mg | D.8mg |