APFIVE Rotational Inertia of a Disk with a Hole
A uniform circular disk of mass M and radius R has a small hole of radius r drilled at a distance d from the center, where r << R and r << d. Compared to the original disk, the rotational inertia about an axis through the center perpendicular to the plane is approximately:
A
Decreased by Md²(r/R)⁴
B
Decreased by (r/R)²Md²
C
Decreased by (r/R)²MR²
D
Decreased by (r/R)²MR²/2
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