# Homework Help: Two harmonic waves

1. Feb 7, 2006

### jh24628

y1 = Asin (kx - wt)
y2 = Asin(kx + wt)

given A, k, w.

what is the amplitude ymax(x) of the resultant wave at x = 2.21 m

need help plz.

2. Feb 7, 2006

### Hootenanny

Staff Emeritus
Can you show some of your working / thoughts?

3. Feb 7, 2006

### jh24628

i dont know where to start this, thats why i'm asking for help, i suck at physics and i have a prof that doesnt teach.

4. Feb 7, 2006

### sporkstorms

You don't have to solve it, or even start solving it.
Just explain some thoughts you have on it, or tell us what you know, or what you don't know, or what you feel needs clarification, or ...

Basically show that you've at least tried to read the relevant material in your textbook, and put a little thought into the problem.

5. Feb 8, 2006

### jh24628

thats the problem, my prof doesnt use the book, he skips around all the time and gives us homework from some website that doesnt go along with what he teaches in class or the book.

6. Feb 8, 2006

### jh24628

i figured it out, A = |2Asinkx|