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Homework Help: Moment of Inertia of square based pyramid?

  1. Sep 1, 2010 #1
    1. The problem statement, all variables and given/known data
    A regular square pyramid (base length a, height b) is spun about its axis of symmetry z.
    Calculate its moment of inertia about the z axis

    2. Relevant equations
    volume of pyramid
    centre of mass

    3. The attempt at a solution
    have found volume and centre of mass. I know the answer to the moment of inertia but when i try to get to it im always out by factors.
  2. jcsd
  3. Sep 1, 2010 #2


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    Try looking at it as a stack of square slabs rotated about their center.
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