题目内容
轻绳OA一端系在天花板上,与竖直线夹角37°,轻绳OB水平,一端系在墙上,O点处挂一重为40N的物体.(cos37°="0.8," sin37°=0.6)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241147086532176.jpg)
(1)求AO、BO的拉力各为多大?
(2)若AO、BO、CO所能承受的最大拉力均为100N,则所吊重物重力最大不能超过多大?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241147086532176.jpg)
(1)求AO、BO的拉力各为多大?
(2)若AO、BO、CO所能承受的最大拉力均为100N,则所吊重物重力最大不能超过多大?
(1)50N 30N 80 N
(2)9.846s
(2)9.846s
1)
(2分)
(2分)
(2)
(2分)
(2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114708684671.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114708700646.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114708731536.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114708731649.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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