(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A piano wire with mass 3.25 g and length 84.0 cm is stretched with a tension of 27.0 N. A wave with frequency 100 Hz and amplitude 1.30 mm travels along the wire.

2. Relevant equations

The only equation that I think applies to this one is P = .5*Sqrt(μ*F)*(omega^2)*A^2

3. The attempt at a solution

I've tried this freaking problem five times now, and I'm down to my last try on Mastering Physics (online homework program).

I thought this was a pretty straightforward problem. I started out solving for μ by basically converting the mass (3.25g) to kg and the length (84cm) to m and then dividing the mass by the length. I solved for omega with the equation omega = frequency * 2PI. F I'm assuming is the tension.

Then I thought it was simply a plug-in problem, but I can't seem to get it right. I had to do five different trials because at first I solved for μ wrong and then I wasn't sure what units the program wanted it in (just had Watts next to the solution, so I just assumed i needed to put everything in to kg and m and all that stuff). But yea, I don't know what I'm doing wrong.

If anyone can help me out on this one I'd appreciate it, just can't seem to figure out what went wrong

thanks in advance

**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: Mechanical Waves - Power

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