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Simple Pendulum and harmonic motion

  1. Nov 13, 2008 #1
    1. The problem statement, all variables and given/known data
    A sim[le pendulum has a mass of .25kg and a length of 1.0m. It is displaced
    through an angle of 15degrees and then released. What are (a) the maximum
    speed, (b) the maximum angular acceleration, and (c) the maximum restoring
    force? Solve the problem once by using the simple harmonic motion model for
    the motion of the pendulum, and then solve the problem more precisely by
    using more general principles.


    2. Relevant equations


    3. The attempt at a solution
    The problem that I am having is getting started. I know this isn't
    hard. I got the part (c) for the second on with the restoring force to be
    mgsin theta = .634N and it is correct. I know the answer for the simple
    models are close to the more precise ones but I can't find any way to
    start.
    Thanks for any help,
    Kevin
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Nov 13, 2008 #2
    Think of where the bob will reach its maximum speed. You might also want to make use of the law of conservation of energy :wink:
     
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