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Homework Help: Pendulum question

  1. Nov 21, 2005 #1
    A pendulum has a mass of 3-kg, a length of 2 meters and swings through a (half)arc of 21.4 degrees. What is its Amplitude to the nearest centimeter ?

    i don't undretand the queston; half arc? amplitude?

    and how would you use kinetic/potential energy change to solve this porblem? i really don't understand this qusetion i'd really likea couple of hints and tips for this problem thanks a lot
     
  2. jcsd
  3. Nov 21, 2005 #2
    74.66 cm
    arc=radius*angle
     
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