Wave, given wavespeed, wavelength, amplitude - find w.

[JoeyBob]

Homework Statement

See attached

Relevant Equations

y(x, t) = Asin(kx-wt)

What I chose to do was analyze what happened at x=0. At x=0 I know sin of whatever will be 0.

So 0=sin(kx-wt) and since x=0, w=Arcsin(0)/t. But this doesn't make sense because the answer isn't 0, its 0.695.

 

[haruspex]

At x=0 I know sin of whatever will be 0.

You do? Why?

 

[JoeyBob]

You do? Why?

Because 0=sin(-wt), so sin of whatever would be 0.

I suppose I could calculate frequency to find w, but idk why this method doesn't work too.

 

[haruspex]

Because 0=sin(-wt)

But that is what I am questioning. Why do you say 0=sin(-wt)? That will only be true at certain times.

 

[JoeyBob]

But that is what I am questioning. Why do you say 0=sin(-wt)? That will only be true at certain times.

Makes sense, thanks.