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Homework Help: Impulse on a pendulum, to maintain amplitude

  1. Apr 2, 2010 #1
    Hi im doing some past exam questions for revision and have got stuck on part d) of the attached question.

    It is asking, if an impulse is applied to a pendulum, what magnitude of impulse is needed to maintain the pendulums ampiltude.

    If it helps the ratio of amplitudes from 2 successive cycles I found to be = exp(-bT/2m), where T=period= 2pi/w


    I think w = (velocity immediately after)/(dist. from pivot to impulse) = 10 rad/s
    but then i dont know where to go from here.

    any help to get started is appreciated
    Thanks
     

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