Transverse displacement, tricky MC

  • #1

Homework Statement

The transverse displacement of a streched string from equilibrium as a function of time and position is given by:
y=0.13cos(3x+27t). x and y are in m; t is in s.
(Select T-True, F-False, G-Greater than, L-Less than, E-Equal to, If the first is T and the rest F, enter

A) The speed of the wave is ... 8 m/s
B) The wavelength is ... 1 m
C) The wave moves in the positive x direction
D) The period is ... 0.1 s

Homework Equations

The only one i was able to solve for was D, using

[tex]\omega[/tex] = [tex]\frac{2\pi}{T}[/tex]

The Attempt at a Solution

Solving for T: T= 2pi/27 gives T= 0.23 s. This designates D as G (greater than).
I can't really figure out how we get the others from T... My main problem is Finding velocity. If i find velocity, i can find the rest. My secondary problem is finding out the direction of the wave.

p.s. even my tutor couldn't get this one.
Last edited:
  • #3
Got it worked out, thanks. My problem was not recognizing what k was in this situation (angular wave number).

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