题目内容
如图所示,为一轻质弹簧的长度和弹力大小的关系.根据图象判断,正确的结论是 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241143344642916.jpg)
A.弹簧的劲度系数为1 N/m |
B.弹簧的劲度系数为100 N/m |
C.弹簧的原长为6 cm |
D.弹簧伸长0.2 m时,弹力的大小为4 N |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241143344642916.jpg)
B C
由图可知,弹簧的原长为6cm,弹簧的劲度系数为
,
当弹簧伸长量为0.2m时,弹力的大小为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114334574725.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114334480951.gif)
当弹簧伸长量为0.2m时,弹力的大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114334574725.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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