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Homework Help: Simple Question About Pendulum I Can't Do

  1. May 11, 2008 #1
    Simple Question About Pendulum I Can't Do !!

    The motion of the bob of a pendulum is described by

    theta = 3cos(3t) - sqrt3 sin(3t)

    where theta is the angle of the bob from the vertical. What is the amplitude of this motion??

    as an attempt, as i know what the answer is, but just dont know how to get to it i substituted the answer for theta and tried to find what t was
    but it didnt help i dont really no where to start for this probelm

    thanks if youcould help
  2. jcsd
  3. May 11, 2008 #2


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    Staff Emeritus
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    Gold Member

    HINT: How do you find the maximum of a function?
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