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Homework Help: Amplitude Question

  1. Feb 8, 2007 #1
    An object with mass 0.269 kg is hung on a spring whose spring constant is 80.3 N/m. The object is subject to a resistive force given by -bv, where v is its velocity. The ratio of the damped frequency to the undamped (natural) frequency) is 0.849. If this system is subjected to a sinusoidal driving force given by

    F(t)=(8.00 N)sin(0.901wo t) ,

    what is the (steady-state) amplitude (in cm) of the resulting sinusoidal motion?

    i know how to find the damping force 'b' and gamma, and Q, and r for the amplitue question, but why does the question give us that F(t) equation and what do we need it for im just stumped any help would be useful
  2. jcsd
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