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Pendulum damped

  1. Jan 31, 2008 #1
    1. The problem statement, all variables and given/known data
    A pendulum with a length of 1.00 m is realeased from an angle 15.0 degrees. after 1000s its amplitude is reduced by friction to 5.50 degrees. what is the value of b/2m.

    2. Relevant equations

    x = Ae^-bt/2m cos(wt + phaseangle)

    w = root(g/L)

    3. The attempt at a solution

    I tried setting x = 15.0 and A = 5.50 (and the reverse) and filling in t with 1000 in the exponent and in cos. (the answer in the book is 1 * 10^-3)
    after getting a w= 3.132 and a phase angle of 0.
  2. jcsd
  3. Feb 1, 2008 #2

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