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When an old LP turntable was revolving at 33(1/3)rpm, it was shut off and uniformly slowed...

When an old LP turntable was revolving at 33(1/3)rpm, it was shut off and uniformly slowed down and stopped in 5.5 seconds.

a) What was the magnitude of its angular acceleration (in rad/s^2) as it slowed down?

b) Through how many revolutions did it turn while stopping?

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