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Moment of inertia

  1. Jun 17, 2012 #1
    Moment of Inerttia of a cone of mass M, radius R, height H, about an axis through its diameter.

    (see attached)

    I am in total agreement with the use of the perpendicular and parsallel axis theorem. However due to the way I drew the cone - simply revered I.e with the diameter at x=0, rather than at the end, so my equation was y = -R/H rather than +, but as only y^2 was required this did not change any of the solution, other than the distance used in the parallel axis theorem. I do not understand at all, why if you choose to use x^2 as the relevant distance from the axis, following through from my diagram, rather than (h-x)^2 I do not obtain the same answer.

    Any one could tell me how my solution is flawed that would be greatly appreciated, many thanks ! ,
     

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    Last edited: Jun 18, 2012
  2. jcsd
  3. Jun 17, 2012 #2

    SammyS

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    Nothing is attached !
     
  4. Jun 18, 2012 #3
    ta - changed now.
     
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