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Need help on getting the resonant frequency

  1. Jun 13, 2012 #1
    A 25.0-kg child in Red Deer pumps herself on a swing when she kicks upward on the downswing, thus changing the distance from the pivot point to her centre of gravity from 2.40 m to 2.28 m.

    1)The resonant frequency of her swing before the kick is: ___ Hz, and the resonant frequency after the kick is: _____ Hz.

    I don't want the answer i just want a hint or a formula i am supposed to use for this, please and thank u. Because my textbook has no examples of it.
     
  2. jcsd
  3. Jun 14, 2012 #2

    Doc Al

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    Staff: Mentor

    Think of the child as a pendulum.
     
  4. Jun 16, 2012 #3
    Yes but what do i do from there i am really confused
     
  5. Jun 16, 2012 #4

    Doc Al

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    Staff: Mentor

    What's the period of a simple pendulum?
     
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