Posted by Qay on Saturday, December 4, 2010 at 5:32am.
The turntable will not slow down if the power is on. A motor keeps it moving at 33.33 rpm. Records (LP) did not have 6 cm radius; it was 6 inches.
If the record player were "coasting" and under no power, you would still need to know the mass of the turntable platen under the record, if you want to predict final angular velocity.
They may want to to apply conservation of angular momentum, but this is a poor choice of problem for applying it.
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