题目内容
如图甲所示,在水平面内的三个质点分别位于直角三角形ABC的顶点上,已知AB=6 m,AC=8 m.t0=0时刻A、B开始振动,波动图象均如图乙所示,所形成的机械波在水平面内传播,在t=4 s时C点开始振动.则
(1)该机械波的传播速度大小为多少?
(2)两列波相遇后,C点振动是加强还是减弱?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241412300982789.jpg)
(1)该机械波的传播速度大小为多少?
(2)两列波相遇后,C点振动是加强还是减弱?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241412300982789.jpg)
:(1)2 m/s (2)加强
:(1)传播速度v=
=
m/s=2 m/s.
(2)Δx=BC-AC=
-AC=2 m.
由图象知λ=2 m.
∴Δx=λ,C点振动加强.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141230160491.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141230378395.png)
(2)Δx=BC-AC=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141230441686.png)
由图象知λ=2 m.
∴Δx=λ,C点振动加强.
![](http://thumb2018.1010pic.com/images/loading.gif)
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