Transverse Wave Problem

1. Apr 6, 2010

lordrrr

1. The problem statement, all variables and given/known data

A transverse wave on a rope is given by the following equation.
y(x, t) = ( 0.710 cm ) cos pi [(0.400 cm^-1)x + (500 s^-1)t]

From this, find the amplitude, period, frequency, wavelength and the speed of propogation.

2. Relevant equations

Well, I know that v=f*lambda. I also know the general equation for sinusodal models in the -x direction:

y(x,t)= A*cos2pi[(x/lamda)+(t/period)]

(I choose to use this particular equation because it ties in with the one given to me)

3. The attempt at a solution

This problem is driving me nuts. I should be able to just take out the units that it aligns with and get that for the answer, right? I took out the 0.71, so I found the amplitude. I found the frequency by dividing 500 by 2. I found the period by dividing 1/250. But I can't for the life of me find the wavelength or the speed of propogation, can anyone please help? Thanks very much!

Last edited: Apr 6, 2010
2. Apr 6, 2010