题目内容
如图所示,有一摆长为l的单摆,悬点正下方某处有一小钉,当摆球经过平衡位置向左摆动时,小钉以上部分摆线被挡住,使摆长发生变化,现使摆球做小角度摆动,图示为摆球从右边最高点M摆至左边最高点N的闪光照片,(悬点和小钉未摄入)P为摆动中的最低点,每相邻两次闪光的时间间隔相等,则小钉距悬点距离为
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A.![](http://thumb.1010pic.com/pic1/upload/papers/g04/20110819/20110819140114046882.gif)
B.![](http://thumb.1010pic.com/pic1/upload/papers/g04/20110819/20110819140114046880.gif)
C.![](http://thumb.1010pic.com/pic1/upload/papers/g04/20110819/20110819140114062905.gif)
D.条件不足,无法判断
![](http://thumb.1010pic.com/pic1/upload/papers/g04/20110819/20110819140114046882.gif)
B.
![](http://thumb.1010pic.com/pic1/upload/papers/g04/20110819/20110819140114046880.gif)
C.
![](http://thumb.1010pic.com/pic1/upload/papers/g04/20110819/20110819140114062905.gif)
D.条件不足,无法判断
C
![](http://thumb2018.1010pic.com/images/loading.gif)
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