Posted by **Anonymous** on Sunday, November 13, 2011 at 3:54pm.

What is the rotational inertia of a solid iron disk of mass 45 kg, with a thickness of 3.44 cm and radius of 19.0 cm, about an axis through its center and perpendicular to it?

- Physics -
**Damon**, Sunday, November 13, 2011 at 4:42pm
r = .19 meter

I = (1/2) m r^2 is moment of inertia of disk

I = (1/2)(45)(.19)^2

That is the rotational moment of inertia, I suspect what you want. If you really want the rotational inertia you must multiply that by omega, the angular velocity in radians per second.

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