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aao0619
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Homework Statement
Determine the moment of inertia of a think disk of mass M, with inner radius A and outer radius B, when rotating about an axis perpendicular to the plane of the disk and through its center.
Homework Equations
The equation of moment of inertia for a disk is I = (m*r^2)/2
my question is that because there are two radii, how does that affect r in the equation?
The Attempt at a Solution
I = (m*r^2)/2 then substitute I = (M*r^2)/2 but is r=(B-A)^2 or is r=(B^2-A^2)?
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