题目内容
(5分)悬链长1.4m,从悬点处断开,使其自由下落,不计空气阻力,则整个悬链通过悬点下方3.2 m处的一点所需的时间为________s。(取g=10m/s2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241452059511304.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241452059511304.jpg)
0.2
试题分析:悬链下端达悬点下方3.2 m处时,下落的高度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145205966869.png)
悬链上端达悬点下方3.2 m处时,下落的高度为3.2 m. 由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145206029652.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145206107684.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145206153697.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145206294928.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145206419958.png)
所需时间
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241452065281082.png)
点评:过程中由于悬链不能看做质点,所以可先计算出下端的点运动到此点时所需的时间,以及上端的点运动到此点时所需的时间,
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目
题目内容