题目内容
量得一只弹簧测力计3 N和5 N两刻度线之间的距离为2.5 cm,求:
(1)这只弹簧测力计3 N、5 N刻度线分别与零刻度线之间的距离.
(2)这只弹簧测力计所用弹簧的劲度系数.
(1)这只弹簧测力计3 N、5 N刻度线分别与零刻度线之间的距离.
(2)这只弹簧测力计所用弹簧的劲度系数.
(1)3.75 6.25 (2)80 N/m
试题分析:弹簧测力计的刻度值应与该刻度线到零刻度线的距离成正比.
(1)设3 N、5 N刻度线到零刻度线的距离分别为x1、x2,弹簧的劲度系数为k.根据胡克定律F=kx可得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151206061418.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151206139371.png)
x1=3.75 cm,x2=6.25 cm.
(2)由F1=kx1可得k=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151206295447.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241512063571159.png)
点评:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151206420479.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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