题目内容
如图所示,用细线将A物体悬挂在顶板上,B物体放在水平地面上A、B间有一劲度系数为100 N/m的轻弹簧,此时弹簧伸长2 cm。已知A、B两物体的重力分别是3 N和5 N。则细线的拉力及B对地面的压力分别是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040401382655.jpg)
A.1 N和0 B.5 N和7 N C.5 N和3 N D.7 N和7 N
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040401382655.jpg)
A.1 N和0 B.5 N和7 N C.5 N和3 N D.7 N和7 N
C
试题分析:以物体B为研究对象进行受力分析,根据共点力平衡条件有
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004040154743.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004040169599.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004040185633.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004040325485.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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