题目内容
一列沿x轴正方向传播的简谐横波在t = 0时刻的波形图如图所示,,已知波速v = 2m/s,试回答下列问题:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241956386372024.png)
(1)求x = 2.5m处质点在0~4.5s内通过的路程及t = 4.5s时的位移;
(2)写出x =" 2.0" m处质点的振动函数表达式。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241956386372024.png)
(1)求x = 2.5m处质点在0~4.5s内通过的路程及t = 4.5s时的位移;
(2)写出x =" 2.0" m处质点的振动函数表达式。
(1)
(2) ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195640010907.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195639495554.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195640010907.png)
试题分析:(1)波长
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195640634532.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195640993621.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195641960652.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241956429741030.png)
在
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195643941483.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195639495554.png)
(2) 振幅
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195645096536.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195640010907.png)
点评:本题难度较小,在1个周期内振动的路程为4A,半个周期内路程为2A
![](http://thumb2018.1010pic.com/images/loading.gif)
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