Two uniform solid disks, Disk A and Disk B

PHYSICS · Single correct · A Level · Physics · Engineering physics · Engineering physics

Problem

Two uniform solid disks, Disk A and Disk B, are made of the same material and have the same thickness. Disk A has twice the radius of Disk B. If both disks rotate about their central axes with the same angular speed ω\omega, which statement correctly compares their rotational kinetic energies KAK_A and KBK_B? (a) KA=4 KBK_A = 4\,K_B (b) KA=8 KBK_A = 8\,K_B (c) KA=16 KBK_A = 16\,K_B (d) KA=2 KBK_A = 2\,K_B

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