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Question: A string, fixed at both ends, oscillates at its fundamental frequency. The length of the string is [tex]60.0cm[/tex], the speed of the wave is [tex]140m/s[/tex], and the maximum displacement of a point at the middle of the string is [tex]1.40mm[/tex] and occurs at [tex]t=0.00s[/tex]. Calculate the displacement of the string at [tex]x=20.0cm[/tex] and [tex]t=0.0380s[/tex].

I think the general equation of a wave is [tex]y=A\cos(kx+\omega t-\phi)[/tex], where [tex]A[/tex] is the amplitude, [tex]k=\frac{2\pi}{\lambda}[/tex], [tex]\omega = 2\pi f[/tex] and [tex]\phi = \frac{2\pi\times\text{phaseshift}}{\lambda}[/tex]