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Simple Harmonic Motion Help

  1. Dec 13, 2009 #1
    1. The problem statement, all variables and given/known data
    A grandfather clock is constructed so that it has a simple pendulum that swings from one side to the other, a distance of 22.0 mm, in 1.00 s. What is the maximum speed of the pendulum bob? Use two different methods. First, assume SHM and use the relationship between amplitude and maximum speed.
    First answer to be in cm/s

    Second, use energy conservation. Assume g = 9.81 m/s2
    Second answer to be in cm/s

    3. The attempt at a solution
    The amplitude is (22.0 mm)/ 2 = 11.0 mm and the period is 1.00 s.
    1st method:
    (2*pi*11*10^-3 m) / 1 s = 6.91 cm/s
    6.91 isn't showing as the correct answer, wondering what i did wrong.
  2. jcsd
  3. Dec 13, 2009 #2


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    Homework Helper

    Period is the time for one to and fro motion of the pendulum.
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