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Homework Help: Moment of inertia of a right triangle

  1. Apr 2, 2007 #1
    in my hw the question wants from me to find the moment of inertia of
    right triangle with the y-axis

    as shown in the attatchment

    note: the mass of the plate is 1 kg

    i found the y coordinate of the center of mass of the plate it is 5/3
    and i supposed it is the r

    so the inertia will be mr^2
    =1*(5/3)^2
    =25/9
    =2.77777 kg m^2

    is that right??
     

    Attached Files:

  2. jcsd
  3. Apr 2, 2007 #2

    radou

    User Avatar
    Homework Helper

    If you're calculating the moment of inertia with respect to the y-axis, then it doesn't look right.
     
  4. Apr 2, 2007 #3
    Thank you >
    but Why??

    can you give me a hint??
     
  5. Apr 2, 2007 #4
    I think it would be better for you to show us how you found that. Also, why do you suppose it is "the r"?
     
  6. Apr 2, 2007 #5

    i found it from the first part of the question
     
  7. Apr 2, 2007 #6
    Now that you found it, please post it.
     
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