题目内容
如图3-2-15所示,A、B是两个相同的轻弹簧,原长都是10 cm,劲度系数k=500 N/m,如果图中悬挂的两个物体质量均为m,现测得两个弹簧的总长为26 cm.g取10 N/kg,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241204253531425.jpg)
图3-2-15
A.m=3 kg B.m=2 kg C.m=1.5 kg D.m=1 kg
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241204253531425.jpg)
图3-2-15
A.m=3 kg B.m=2 kg C.m=1.5 kg D.m=1 kg
D
B弹簧的伸长量为xB=
,A弹簧的伸长量为xA=2
,而xA+xB="6" cm,联立得m=1 kg.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120425368525.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120425368525.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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