PHYSICS · Single correct · A Level · Physics · Engineering physics · Engineering physics
Problem
Three identical solid, uniform discs—A, B, and C—each have the same radius but different masses and angular speeds as listed:
• Disc A: mass 2m, angular speed ω
• Disc B: mass m, angular speed 2ω
• Disc C: mass 3m, angular speed 0.5ω
Rank the discs’ rotational kinetic energies from greatest to least.
(a) C > A > B
(b) B > A > C
(c) A > B > C
(d) A > C > B