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F = ma (11–17)
Simple Harmonic Motion
FMA-2020B-13 · 2020B F = ma (AAPT)

2020 F = ma Exam B — Question 13

A uniform disk of mass m and radius r is attached at its edge to a flexible pivot on the ceiling. It is given a small displacement perpendicular to the plane of the disk, so that it begins to oscillate perpendicular to the plane of the disk. What is the period of oscillation? The moment of inertia of a disk about the axis going through its center and perpendicular to the plane it’s in is Idisk = 21 mr2 p 2r/5g p (B) π 5r/g p (C) π 6r/g p (D) 2π r/g p (E) 2π 2r/g
Source: Question 13, 2020 F = ma Exam B, © 2020 American Association of Physics Teachers (AAPT) and the U.S. Physics Team. Adapted by PhysicsTrainer: reformatted into a separate question and answer choices for online multiple-choice practice; any shared setup from nearby questions is repeated here. Not affiliated with or endorsed by AAPT or the U.S. Physics Team.