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Homework Help: Moment of Inertia/Torque about point O of the rod

  1. Dec 6, 2012 #1
    1. The problem statement, all variables and given/known data
    A thin rod of length L and mass M is free to rotate at a point O at a distance L/3 from one end.

    a.) What is the moment of inertia of the rod about O?
    b.) What is the magnitude of the torque due to the rod's own weight about O when it is displaced from the vertical by and angle θ?
    c.) For small angular displacement, find the period of oscillation of this rod.

    2. Relevant equations
    Irod= 1/3ML2

    3. The attempt at a solution
    Not really sure what to do here
  2. jcsd
  3. Dec 6, 2012 #2


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    Homework Helper

    First, what is the moment of inertia of a rod about its center? Then look up "Parallel Axis Theorem".
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