题目内容
如图所示,质量为
的球与弹簧Ⅰ和水平细线Ⅱ相连,Ⅰ、Ⅱ的另一端分别固定于P、Q。球静止时,Ⅰ中拉力大小为
,Ⅱ中拉力大小为
,当仅剪断Ⅰ、Ⅱ中的一根的瞬间,球的加速度
应是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250002237215728.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000223658337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000223674319.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000223689365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000223705283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250002237215728.jpg)
A.若断Ⅱ,则![]() |
B.若断Ⅱ,则![]() |
C.若断Ⅰ,则![]() |
D.若断Ⅰ,则![]() |
BD
试题分析:剪断II的瞬间,弹簧弹力与小球重力都没发生变化,因此合力与II的拉力T2等大反向,加速度大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000223752605.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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