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Homework Help: Moment of inertia

  1. Nov 17, 2006 #1
    hi everyone,

    ive got problem on calculation of moment of inertia for a body that has non-uniform mass contribution . take for example a disc, i believe we can't apply I = (1/2)mr^2 since if we traced back to the derivation of the inertia formula, it assuming constant rho(density)=mass/volume which is not applicable for a body without uniform mass contribution.

    Anyone has any idea how calculate the right moment of inertia:confused: :uhh:
  2. jcsd
  3. Nov 17, 2006 #2


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    Homework Helper

    Try somehow to apply the general definition of the moment of inertia [tex]I = \int_{V} r^2 \rho dV[/tex] to your problem. If you know the mass distribution function, this shouldn't be hard.
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