题目内容
重100N的物体通过轻绳A、B、C悬挂在小车的天花板上,它们静止时轻绳A、B与竖直方向夹角分别为
和
,如图所示.若物体和小车一起以加速度a向右匀加速运动,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250018520144580.jpg)
A.绳B所受拉力是
=50N
B.绳A所受拉力
小于
N
C.绳C沿竖直方向
D.绳C所受拉力大于100N
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001851967379.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001851998384.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250018520144580.jpg)
A.绳B所受拉力是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001852029373.png)
B.绳A所受拉力
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001852060373.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001852076469.png)
C.绳C沿竖直方向
D.绳C所受拉力大于100N
BD
试题分析:当小车和物体静止时,由平衡方程可知:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250018520921045.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001852123889.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001852138623.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001852154740.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001851998384.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001852185830.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001852201840.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001852216519.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001852232545.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001852248496.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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