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Homework Help: Wave Motion of sinusoidal wave

  1. Jun 8, 2008 #1
    1. The problem statement, all variables and given/known data

    For a sinusoidal wave:

    At a certain instant, let point A be at the origin and point B be the first point along the x axis where the wave is 60.0° out of phase with point A. What is the coordinate of point B?

    y = (15.0 cm) cos(0.157x - 50.3t)

    2. Relevant equations

    3. The attempt at a solution

    x(at point B) = theta + 0 = 60.0° = pi/3 rad = ~1.05 m.
    y(at point B) = (0.150 m) cos(0.157[1.047 m] - 50.3[0]) = 0.148 m

    (x, y) = (1.05, 0.148) m


    I don't understand what the question is asking for. I am handing this in, online, and it checks the answers (I have 3 tries left).
    Last edited: Jun 8, 2008
  2. jcsd
  3. Jun 8, 2008 #2
    I found the answer.
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