Still solving for part B. Part A is correct. A record player turntable initially

Question

Still solving for part B. Part A is correct. A record player turntable initially rotating at 33 1/3 rev/min is braked to a stop at a constant rotational acceleration. The turntable has a rotational inertia of 0.019 kg. m^2 . When it ?s switched off, it slows down to 75% of its initial rotational speed in 5.5 s. Part A How long does it take to come to rest? Express your answer with the appropriate units. t= 22s Part A How long does ?t take to come to rest Express your answer with the appropriate units. t= 22s Part B Give Up 1 How much work has to be done on the turntable to bring it to rest? Express your answer with the appropriate units. w= .26 Correct

Explanation / Answer

work done = Initial Kinetic energy - Final kinetic energy

= 0.5*I w^2 - 0

= 0.5*0.019*3.488^2 = 0.115 J

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