题目内容
如图所示,小球用两根轻质橡皮条悬吊着,且AO呈水平状态,BO跟竖直方向的夹角为α,那么在剪断某一根橡皮条的瞬间,小球的加速度情况是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022331281866.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022331281866.png)
A.剪断AO瞬间,小球加速度大小是零 |
B.剪断AO瞬间,小球加速度大小a=gtanα |
C.剪断BO瞬间,小球加速度大小是零 |
D.剪断BO瞬间,小球加速度大小a=gcosα |
B
试题分析:以小球为研究对象,剪断橡皮条前其受力情况如图,根据平衡条件 得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022331445697.png)
AO绳的拉力大小为FA=mgtanα,BO绳的拉力大小为FB=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002233160645.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002233160645.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002233206539.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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