题目内容
如图所示,B.C两个小球的重均为G,用细线悬挂于M、N两点。求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241155115361531.gif)
MB和CN两根细线的拉力各多大?
细线BC与竖直方向的夹角是多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241155115361531.gif)
MB和CN两根细线的拉力各多大?
细线BC与竖直方向的夹角是多少?
T1=
G,T2=G;α=60°
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115511552968.gif)
如图所示,小球B受重力G、细线MB拉力T1、BC拉力T处于平衡。有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241155115671973.gif)
T1cos30°=G+Tcosα,T1sin30°=Tsinα,
小球C受重力G、细线NC拉力T2、BC拉力T处于平衡。有
T2cos60°+Tcosα=G,T2sin60°=Tsinα
解得T1=
G,T2=G;α=60°。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241155115671973.gif)
T1cos30°=G+Tcosα,T1sin30°=Tsinα,
小球C受重力G、细线NC拉力T2、BC拉力T处于平衡。有
T2cos60°+Tcosα=G,T2sin60°=Tsinα
解得T1=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115511552968.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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