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Rigid Body Dynamics: MOI — Parallel Axis Application MCQ

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MOI — Parallel Axis ApplicationMediumQuestion 30345

Question

The MOI of a disc (M, R) about a tangential axis perpendicular to its plane is:
  1. A
    3MR²/2
    Correct
  2. B
    MR²/2 + MR²
  3. C
    MR²/4 + MR²
  4. D
    MR² + MR²/2

Correct answer

3MR²/2

Explanation

I_cm (perpendicular to plane) = MR²/2. Using PAT with d = R: I = MR²/2 + MR² = 3MR²/2.

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