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

A sine wave in + x direction with max amplitude of 1

wavelength= 2.85 m

wavenumber, k = 6.28/2.85 m = 2.2 rad/m

w=8rad/m

frequency=1.27 cyc/sec

vel.= 3.63 m/sec

at x = 20m t= 5.5 sec

at x + 2 wavelengths x= 25.7m t=7.07 sec

by definition the y displacement is the same at (x) as it is at (x + 2 wavelengths)

2. Relevant equations

y (x,t)= A sin(kx-wt)

3. The attempt at a solution

just considering y= Asin(kx) at x= 20m ,y= .0177

with y= Asin(k x+2 wavelengths) x= 25.7m, y=-.00866

with radian set calculator

I dont understand wht the y displacements are not the same

Also if the other variables are put into the solution A=Aosin(kx-wt)

then in both cases (kx-wt) =0 ?

2. Relevant equations

3. The attempt at a solution

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

2. Relevant equations

3. The attempt at a solution

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

2. Relevant equations

3. The attempt at a solution

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

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

# Homework Help: Y displacements in sine wave at (x) and (x + 2 wavelengths)

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