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Rotatinal inertia help?

  1. Aug 2, 2010 #1
    1. The problem statement, all variables and given/known data
    How do I find Rotational inertia of this?http://yfrog.com/e4asdfasdfasdfj. Assumed thin rod (ignore r).


    2. Relevant equations
    I=1/12 M L2


    3. The attempt at a solution
    Cause that equation applies if the rotation axis is at the center, so I doubled d (and got like (2d)2 and (4d)2) and used the equation, but I ended up with something like 5/3Md2, but the answer at the back says its 8/3Md2.
     
  2. jcsd
  3. Aug 2, 2010 #2

    Doc Al

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    Staff: Mentor

    If you know the rotational inertia about the center of mass, use the parallel axis theorem to find the rotational inertia about the end.
     
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