题目内容
使悬挂在长绳上的小球A偏离平衡位置一个很小的角度,然后释放,同时使另一个小球B由静止开始从长绳的悬点自由下落,如图所示,C为单摆A的最低位置.下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241205131351416.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241205131351416.jpg)
A.A和B同时到达C点 | B.B先到达C点 |
C.A先到达C点 | D.无法确定 |
B
A做简谐运动,tA=
=
=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120513182491.gif)
B做自由落体运动tB=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120513213329.gif)
又因为
>![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120513245225.gif)
所以tA>tB
B正确.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120513151251.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120513167521.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120513182491.gif)
B做自由落体运动tB=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120513213329.gif)
又因为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120513229230.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120513245225.gif)
所以tA>tB
B正确.
![](http://thumb2018.1010pic.com/images/loading.gif)
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