# Homework Help: Transverse wave pulse

1. May 4, 2007

### bilals

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

2. The attempt at a solution

i thought it was number one...as we have -4.5m/s in the equation indicating that the pulse is moving in the negative direction.. i submitted the answer.unfortunately it was incorrect..

Can you help me with this..if possible.

Last edited: May 4, 2007
2. May 4, 2007

### Nylex

What about number 7? The dimensions are wrong in number one, because you have $x^2 - vt$, so $x^2$ has units of $(ms^{-1})^2$ and vt units of $ms^{-1}$.

3. May 4, 2007

### bilals

Thank you Nylex for ur help....i submitted the answer (number 7)but.....--->its wrong.
i thought again about the dimensions..i found that number two also has correct dimensions. i submitted it..and its correct.
my reasoning (not sure if it's correct)..that the negative outside the bracket when multiplied but +4.5t,becomes negative ..indicating the negative direction of the pulse.

Correct solution (Number 2)

Last edited: May 4, 2007