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Moment of inertia of triangle rotated about y axis

  1. Dec 18, 2011 #1
    hefjewfwef.png

    Similar to my other thread https://www.physicsforums.com/showthread.php?t=557750

    I think in this case I need to use triple integrals

    But what is the integrand and limits?

    Can someone please help me set it up?

    Here's all I know

    Code (Text):

    ∫∫∫dydx
     
    Please help I have my final next wednesday.
     
  2. jcsd
  3. Dec 18, 2011 #2

    ehild

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    Find the moment of inertia. What is the moment of inertia of a point mass dm at distance r from the rotation axis? The triangle consist of small masses, and you need to integrate their contribution.
    ehild
     
  4. Dec 20, 2011 #3
    I don't know :(
     
  5. Dec 20, 2011 #4
    I have 6 exams this week and my physics exam is tomorrow so please just walk me through this problem. I have no time left to spend trying to figure it out.
     
    Last edited by a moderator: Apr 27, 2017
  6. Dec 20, 2011 #5

    ehild

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    I can not do, sorry. The policy of the Forums does not allow it.

    ehild
     
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