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Simple pendulums

  1. Jun 24, 2009 #1
    1. The problem statement, all variables and given/known data


    A simple pendulum is made from a 0.67 m long string and a small ball attached to its free end. The ball is pulled to one side through a small angle and then released from rest. After the ball is released, how much time elapses before it attains its greatest speed?

    2. Relevant equations

    f=frequency
    f=(1/2pi)(g/L)^.5

    f=1/T
    where T=period

    3. The attempt at a solution


    f=1/T

    f=(1/2pi)((9.8m/s^2)/0.67m))^.5
    f=6.007

    f=1/T
    6.007=1/T
    T=1/6.007
    T=.166s

    This is the answer that i got but it is wrong and i do not know why, and now how to do it if this is the wrong way.
     
  2. jcsd
  3. Jun 24, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Redo this calculation.
     
  4. Jun 24, 2009 #3

    jix

    User Avatar

    Redo the calculation, perhaps, and divide period by 4, since reaching the bottom takes one-quarter of the period.
     
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