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Homework Help: Power Supplied To The String

  1. Oct 24, 2011 #1
    1. The problem statement, all variables and given/known data

    A string with linear mass density of 0.143 kg/m is under a tension of 107 N. How much power must be supplied to the string to generate a sinusoidal wave of amplitude 1.97 cm and frequency 107 Hz?

    2. Relevant equations


    3. The attempt at a solution

    I found V and ω by using equations above but don't know how to calculate power.

  2. jcsd
  3. Oct 24, 2011 #2
    The question should probably be rephrased "How much energy..." rather than "How much power..." With nothing in the problem's statement describing how the string might dissipate energy, I'd assume there's no energy loss at all -- the string vibrates forever. Try calculating the string's kinetic energy as it passes through minimum amplitude.
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