# moment of area.

• July 10th 2008, 07:33 AM
abz
moment of area.
A circle has a radius of 0.4m. Determine its second moment of area
(ii)about an axis 1.8m from its centre of area.
• July 10th 2008, 10:55 AM
ViperRobK
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
$
ma^2/2
$

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
$ma^2/2 + md^2$