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Second Moment of Inertia of a Rectangle

  1. Dec 6, 2012 #1
    1. The problem statement, all variables and given/known data
    Find the second moment of inertia of a rectangle.

    3. The attempt at a solution
    bX6Z7.png

    Anyone know why my answer is 4 times too big?
     
  2. jcsd
  3. Dec 6, 2012 #2

    rock.freak667

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    Homework Helper

    Your limits of integration imply that your axis of references is the x-axis (which is correct by the way).

    The "correct" answer you want is to get Ix about the centroidal axis. In which case your limits would be different.
     
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