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Axes passing thru centroid

  1. Nov 23, 2015 #1
    1. The problem statement, all variables and given/known data
    determine the second moment of inertia about the horizontal axis and vertical axis for the shaded area with respect to x and y axes through the centroid of the area .

    2. Relevant equations


    3. The attempt at a solution
    Since the x and y axes is drawn thru centroid , why not the y for part 1 = 0mm ? y for part 2 = -30mm?
     

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  3. Nov 23, 2015 #2

    SteamKing

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    Because the axes being used for the calculation are not the same ones shown in Fig. 6.7. The calculation axes are shown at the lower right-hand part of the page, just above the table.

    You must read the text in order to follow what is going on; you can look at one picture and assume it applies regardless.
     
  4. Nov 24, 2015 #3

    haruspex

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    You meant 'cannot', right?
     
  5. Nov 24, 2015 #4

    SteamKing

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    Yes.
     
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