题目内容
一个单摆的振动位移与时间的关系如图所示,当t="2" s时,摆球的位移为__________,速度为__________,0—2 s内通过的路程为__________.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241141294302088.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241141294302088.jpg)
0 0.25 m/s 0.32 m
可由T=2π
知
l="1" m,
mvA2=
kA2=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114129633225.gif)
A2求出vm="0.25" m/s或
mvA2=mgl(1-cosθ),cosθ=
亦可求出vm="0.25" m/s.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114129571300.gif)
l="1" m,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114129633225.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114129633225.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114129633225.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114129680386.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114129633225.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114129711489.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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