- #1
tshah321
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Homework Statement
What is the moment of inertia of the 4 kg disk below when it rotates about the center of mass? The mass of the disk without the holes is 6 kg
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Homework Equations
Center of mass equation: (1/M)(∫xdm)
Moment of inertia of a disk: I = 0.5mr2
Parallel axis theorem: I = Io + md2
The Attempt at a Solution
I tried to find the moment of inertia of the disk without the holes using m = 6 kg and r = 0.12 m.
I = 0.5(6 kg)(0.12 m)2 = 0.0432 kgm2
I think I'm supposed to subtract each hole's moment of inertia from 0.0432, but am unsure how to find each circle's radius. Is it simply r = 0.05m? Or is it 0.06m? Or is my line of thinking totally off?