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Moment of inertia of an ellipse

  1. May 15, 2013 #1
    hello!
    I have to verify the formula of the moment of inertia of an ellipse about its' centroidal axis,
    is it M*(a^2 + b^2)/4.This is the one I got by myself.
    But in a webpage it was given as Pi*a*(b^3)/4.

    NOTE: don't ask for the proof of what I did.Its' a bit longer.I just wanna know whether its' correct or
    not.
     
  2. jcsd
  3. May 15, 2013 #2
    You are mixing things up. The Quantity given on the webpage is is the "Area moment of Intertia" not the mass moment of inertia. Read on the two quantities and then you will see what to do...
     
  4. May 15, 2013 #3
    Ok then what I found out was correct.
     
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