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Physics: mathematical description of a wave, direction, displacement

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The displacement (in meters) of a wave is y= 0.26 sin (pi *t-3.7 pi *x), where t is in seconds and x is in meters.
(a) Is the wave traveling in the +x or -x direction?
(b) What is the displacement y when t= 38 seconds and x= 13 meters?

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The narrative and calculations clearly define the solution. The mathematical description of wave, direction and displacement are provided.

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The general wave equation is given as :

y(x,t) = A*sin(kx-wt+phi)

a)In this ...

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