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Homework Help: Physical Pendulums

  1. Mar 22, 2007 #1
    1. The problem statement, all variables and given/known data
    "A circular hoop of radiusm 50 cm is hung on a narrow horizontal rod and allowed to swing in the plane of the hoop. What is the period of its oscillation, assuming that the amplitude is small?

    2. Relevant equations

    T= 2*pi(I/(MgD))^.5

    3. The attempt at a solution

    Ok... so if M is not given for the hoop and the rod, how do I go about figured it out? What is the value of D? And do I factor the moment of inertia for both the rod and hoop, and if so... how do I figure out the length of the rod, if it is not given.

  2. jcsd
  3. Mar 22, 2007 #2
    Find the moment of inertia- it will have a factor of M in it.
    I believe D is the distance from the center of mass to the pivot point.
    Is the rod rotating?
  4. Mar 22, 2007 #3
    Yes.. it is swinging from the hoop
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