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Homework Help: Rotational inertia

  1. May 7, 2007 #1
    1. The problem statement, all variables and given/known data

    i need to find the rotational inertia of a rod about a pivot. The rod is of mass M and length L and is attached to a pivot of negligible friction located at a distance of L/3 from the left end of the rod.

    2. Relevant equations



    3. The attempt at a solution

    i know that if the pivot were in the center it would be (1/12)ML and if the pivot were on the end it would be (1/3)ML, but i dont know how to find it at (L/3). can anyone help me? id really appreciate it! thanks.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. May 7, 2007 #2

    hage567

    User Avatar
    Homework Helper

    Try the parallel-axis theorem.
     
  4. May 7, 2007 #3
    thanks, ill try it!
     
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