题目内容
(6分)我校同学们在研究性学习中,利用所学的知识解决了如下问题:一轻弹簧竖直悬挂于深度为h=25.0cm,且开口向下的小筒中(没有外力作用时弹簧的下部分位于筒内),如图甲所示,如果本实验的长度测量工具只能测量出筒的下端弹簧的长度
,现要测出弹簧的原长
和弹簧的劲度系数,同学们通过改变
而测出对应的弹力
,作出
变化的图线如图乙所示,则弹簧的劲度系数为k=______N/m,弹簧的原长
=______m.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020233057144.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023196280.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023211332.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023196280.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023258302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023274396.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023211332.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020233057144.jpg)
100N/m , 0.15m.
试题分析:设弹簧原长为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023211332.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020233521002.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023274396.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020233991205.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023414369.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023445541.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023477706.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002023492629.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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