题目内容
如图所示,绳与杆均不计重力,承受力的最大值一定.A端用绞链固定,滑轮O在A点正上方(滑轮大小及摩擦均可忽略),B端吊一重物P,现施加拉力FT将B缓慢上拉,在杆转到竖直前
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250016098042460.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250016098042460.jpg)
A.OB段绳中的张力变大 |
B.OB段绳中的张力变小 |
C.杆中的弹力大小不变 |
D.杆中的弹力变大 |
BC
试题分析:以杆与绳子的交点为研究对象,可知该交点受到竖直向下的拉力(大小等于G),OB段绳子的拉力
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001609820417.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001609836823.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001609820417.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001609882741.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目