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1. A uniform disk of mass m and radius R..-阿摩線上測驗
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1. A uniform disk of mass m and radius R (so the moment of inertia 
) is
rotating about its symmetric axis at an angular velocity ω0. A ring of the same mass m
and radius R originally at rest suddenly drops on the disk. The coeffieient of kinetic
friction between the disk and the ring is μ. How long does it take for the ring to reach a
final angular velocity ω and rotate together with the disk as shown in the right figure?
The gravitational acceleration is g.
(A) 
(B) 
(C) 
(D) 
(E) 