DP Physics (first assessment 2025)

Question EXE.1A.HL.TZ0.9

Date	Example questions Example questions	Marks available	[Maximum mark: 1]	Reference code	EXE.1A.HL.TZ0.9
Level	HL	Paper	1A	Time zone	TZ0
Command term		Question number	9	Adapted from	N/A

[Maximum mark: 1]

EXE.1A.HL.TZ0.9

A turntable of mass $M$ and radius $R$ spins freely about the vertical axis at an initial angular velocity $ω$ . The moment of inertia of the turntable about the axis of rotation is $\frac{1}{2} M R^{2}$ . A small body of mass $m$ is dropped close to the edge of the turntable with a negligible initial velocity.

The body comes to rest relative to the turntable. What is the final angular velocity of the turntable?

A. $\frac{M}{M + 2 m} ω$

B. $\frac{M}{M + m} ω$

C. $\frac{M}{2 M + m} ω$

D. $\frac{2 M}{M + m} ω$

[1]

Markscheme

Syllabus sections

A. Space, time and motion

A. Space, time and motion » A.4 Rigid body mechanics

Question EXE.1A.HL.TZ0.9

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