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.

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- Jul 10th 2008, 07:33 AMabzmoment 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. - Jul 10th 2008, 10:55 AMViperRobK
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

$\displaystyle

ma^2/2

$

and once the axis has been moved you can use the paralell axis theoreom and just add

$\displaystyle md^2$

Where d is the distance of the pivot from centre of mass of the object

so for part b you get

$\displaystyle ma^2/2 + md^2$