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Math Help - moment of area.

  1. #1
    abz
    abz is offline
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    moment of area.

    A circle has a radius of 0.4m. Determine its second moment of area
    (ii)about its centre of area.
    (ii)about an axis 1.8m from its centre of area.
    Last edited by abz; July 10th 2008 at 08:56 AM.
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  2. #2
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    Do you mean moment of inertia as that would make more sense but I can't be sure here is the way for moment of inertia

    Moment of Inertia of a circle about its centre is
    <br />
ma^2/2<br />

    and once the axis has been moved you can use the paralell axis theoreom and just add
    md^2
    Where d is the distance of the pivot from centre of mass of the object

    so for part b you get
    ma^2/2 + md^2
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