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Homework Help: Wave Speeds on a String

  1. Dec 6, 2015 #1
    1. The problem statement, all variables and given/known data
    You have a long string, and you oscillate one end, causing a (transverse) wave to propagate along it. The wave's formula is D=0.40sin(7.0x+38t) where displacement D and position x are given in meters and time t is given in seconds.

    Determine the maximum and minimum transverse speeds of particles of the string.
    2. Relevant equations
    v= omega/k

    3. The attempt at a solution
    I found the wave speed, which is equal to 5.4 m/s, but I am not sure how to find the maximum and minimum speeds from this.
  2. jcsd
  3. Dec 7, 2015 #2
    The given wave equation for the particles on the string is sinusoidal. Note that this equation is for the motion of the individual particles on the string, and so how would you obtain the equation describing the speed of the individual particles (from the displacement equation given to you)?

    Hint: It's not v = ω/k
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