- #1

yjk91

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## Homework Statement

A wave travels along a string in the positive x-direction at 33 m/s. The frequency of the wave is 48 Hz. At x = 0 and t = 0, the wave velocity is 2.8 m/s and the vertical displacement is y = 3 mm. Write the function y(x, t) for the wave. (Use the following as necessary: x and t. Assume x and y are in m, and that t is in s.)

## The Attempt at a Solution

y(x,t) = Acos(kx - wt)

should be the formula

i'm assuming A = 0.003m but it is not so i don't know

w = 2 * pi * f (frequency)

= 2 * pi * 48Hz

= 301.59

k = w / v

= 301.59 / 33(m/s)

= 9.139

so what i have now is y(x,t) = Acos(9.139x - 301.59t + something)

how do i find the amplitude and the missing something if there is one?

thank you