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Pendulum Oscillations

  1. Apr 30, 2009 #1
    1. The problem statement, all variables and given/known data
    A physical pendulum consists of 4.8 m long sticks joined together as shown in Fig. 15-43. What is the pendulum's period of oscillation about a pin inserted through point A at the center of the horizontal stick?

    http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c15/fig15_43.gif [Broken]

    2. Relevant equations
    w = sqt(MgL/I)
    T = 2pi/w
    I = 1/12ml^2 + 1/3ml^2
    L = l/4

    3. The attempt at a solution

    I solved for I using the above equation 3, solved for L using equation 4, plugged these values into equation 1 getting angular velocity. Then I solved for T in equation 2 and I do not get the correct answer.
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Apr 30, 2009 #2
    you have to acount for the fact that the centre of mass of the T-shaped pendulum is positioned higher then it would with just a simple one-stick pendulum
  4. Apr 30, 2009 #3
    how do i take that into account..?
  5. Apr 30, 2009 #4
    Wot: no string this time?
  6. Apr 30, 2009 #5
    What? lol

    what are you asking
  7. Apr 30, 2009 #6
    Refererence to "string+sphere" thread.

    Your pendulum seems to be more rigid, but the problem
    emphasizes the impotency of the moronic reliance on formulae.
  8. Apr 30, 2009 #7
    Yea.. that doesn't help much =P
  9. Apr 30, 2009 #8
    Could anyone else please provide some input?
  10. Apr 30, 2009 #9
  11. May 1, 2009 #10
    L is the distance between the pivot and c of m
    You said "1/4"
    It is 4.8m/4
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