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Differential moment of inertia

  1. Jul 13, 2014 #1

    kyu

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    1. The problem statement, all variables and given/known data

    since it's asking us to find the moment of inertia with respect to y-axis, why did they draw the differential element to x-axis?

    2. Relevant equations



    3. The attempt at a solution

    because of the initial problem.. i don't know how to start.. so

    dA = x dy
    I(y) = x^2 (x dy)
     

    Attached Files:

  2. jcsd
  3. Jul 14, 2014 #2

    Simon Bridge

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    ... they show an element width dy and length x at position y=x^3.
    How would you do it?
     
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