Posted by **Anonymous** on Monday, November 29, 2010 at 10:16am.

A harmonic wave moving in the positive x direction has an amplitude of 3.1 cm, a speed of 37.0 cm/s, and a wavelength of 26.0 cm. Assume that the displacement is zero at x = 0 and t = 0.

Calculate the displacement (in cm) due to the wave at x = 0.0 cm, t = 2.0 s.

- physics -
**drwls**, Monday, November 29, 2010 at 10:34am
The wave equation for deisplacement (Y)is

Y = (3.1 cm)* sin [2 pi)(x/L - f*t)]

f is the frequency, which is

(37 cm/s)/(26 cm) = 1.423 Hz

Insert x = 0 and t = 2s to compute the answer.

- physics -
**Anonymous**, Monday, November 29, 2010 at 10:47am
I'm still not getting the correct answer when I use the above formula. When I plugged in 0 for x and 2 for t, I simplified the equation to

Y= 3.1 * sin (2pi (-2.846))

Y=3.1 * sin (-17.88)

Y=3.1 * -.307

Y=-0.952 cm

What am I doing wrong?

- physics -
**Anonymous**, Monday, November 29, 2010 at 2:11pm
nevermind, I was stupid and didn't have my calculator in radians! Thank!

## Answer This Question

## Related Questions

- Physics - Write an expression for a transverse harmonic wave that has a ...
- Physics - 1) A wave with frequency 3.1 Hz and amplitude 2.7 cm moves in the ...
- Physics - A sinusoidal wave traveling on a string is moving in the positive x-...
- Physics - A sinusoidal wave traveling on a string is moving in the positive x-...
- Physics HELP!! - a). The displacement of a wave travelling in the positive x-...
- physics - A wave with frequency 11.3Hz and amplitude 48.1 mm moves in the ...
- physics - A wave with frequency 11.3Hz and amplitude 48.1 mm moves in the ...
- Physics - A wave with frequency 12.2Hz and amplitude 47.7 mm moves in the ...
- Physics - Two waves are combined to form this standing wave equation of y(x,t...
- Physics - Two waves are combined to form this standing wave equation of y(x,t...

More Related Questions