题目内容
如图所示,用完全相同的轻弹簧A、B、C将两个相同的小球连接并悬挂,小球处于静止状态,弹簧A与竖直方向的夹角为37o(sin37o=0.6),弹簧C水平,则弹簧A、C的伸长量之比为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032389402545.jpg)
A.4:3
B.3:4
C.5:3
D.3:5
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032389402545.jpg)
A.4:3
B.3:4
C.5:3
D.3:5
C
试题分析: 将两球和弹簧B看成一个整体,整体受到总重力G、弹簧A和C的拉力,如图,设弹簧A、C的拉力分别为F1和F2.由平衡条件得知, F2和G的合力与F1大小相等、方向相反
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032389711765.png)
所以sin37°=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003238987450.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003239002525.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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