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Homework Help: Pendulum question

  1. Nov 2, 2005 #1
    I am sure this is simple to most people...but i dont understand how to show potential energy of a pendulum to be mgcostheta/2l. is there anybody that could break that down for me??
  2. jcsd
  3. Nov 2, 2005 #2

    Chi Meson

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    First of all, it's not.

    PE of a pendulum is mg [L-Lcos(theta/2)].

    What's the usual formula for PE? What of the above formula is equal to the "h"?
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