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Homework Help: Displacement of a traveling wave

  1. Nov 29, 2009 #1
    1. The problem statement, all variables and given/known data
    The displacement (in meters) of a wave is y = 0.13 sin(t - 3.82x), where t is in seconds and X is in meters.

    (a) Is this wave traveling in the +x or -x direction?

    1.+x direction.
    2.-x direction

    (b) What is the displacement y when t = 26.5 s and x = 6.4 m?

    3. The attempt at a solution

    The solution for part a is positive x direction
    I cannot figure out how to do this problem at all. Professor did not cover this material and I have no background knowledge in vibrations or waves. I have been reading the chapter in the book, but it doesn't make any sense and doesn't have any equations. I'd really appreciate a good teacher right now. :)
  2. jcsd
  3. Nov 29, 2009 #2


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    Homework Helper

    I don't see any physics in this question! It is just some arithmetic work. You must substitute t = 26.5 s and x = 6.4 m into the equation
    y = 0.13 sin(t - 3.82x)
    and find the value of y.
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