A Compact Disc player starts spinning a CD from rest to a final speed of 500 revolutions per minute. The mass of the CD is 20 grams. Modeling the CD as a uniform disk (ignoring the hole in the center) with a radius of 6 cm, and ignoring the moment of inertia of the motor itself, what torque (in N-m) must be applied to the CD to make it reach this final speed in 0.5 seconds? The moment of inertia of a uniform disk spinning around its center is 1/2*m*r2.
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