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Homework Help: Method of undertermined coefficients

  1. Dec 10, 2009 #1
    1. The problem statement, all variables and given/known data
    The motion of an undamped mass-spring system is described by the differential equation 2x" + 36x = sin(wt)

    a) For what values of w will the system exhibit resonance?
    b) Use the method of undertermined coefficients to find a particular solution in the case where w is not the resonant frequency.

    I know I have to use y = Asin(wt) but I am stuck after that.
  2. jcsd
  3. Dec 10, 2009 #2


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    Homework Helper

    Re: Resonance

    Do you know how to solve a second-order differential equation? First you solve the corresponding homogeneous equation, then find a particular solution, then add the two. You may find it easier to do a) after doing b).
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