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Homework Help: Calculating Moment Of Inertia

  1. Oct 23, 2004 #1
    Can someone point me in the right direction on how to find the moment of inertia of a uniform thin solid door, height 2.2 m, width .870 m and mass 23 kg. Do I need to use calculus to solve this type of problem? thanks!
  2. jcsd
  3. Oct 23, 2004 #2
    moment of inertia = Integrate[r^2 dm] where dm is given by a density * an appropriate differential. r is perpendicular distance from the mass element to the axis of rotation. the bounds of the integral and the dm are given by the geometry of the problem.
  4. Oct 23, 2004 #3


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    Homework Helper

    Use the moment of inertia of an uniform rectangular plate

    [tex] I_{cm} = \frac{1}{12}M(width^2 + height^2) [/tex]
  5. Oct 24, 2004 #4
    sweet thanks guy, i got it! laters
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