Hi there, I'm trying to teach myself some concepts involving waves. I tried a problem from an old physics exercise book, but I am having difficulty in getting the correct answer. I was wondering if someone can please point me into the right direction or show me a link where I can read more about this kind of stuff. Thank You!(adsbygoogle = window.adsbygoogle || []).push({});

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]

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Waves Motion

**Physics Forums | Science Articles, Homework Help, Discussion**