Homework Help: physics

Posted by emily on Sunday, November 28, 2010 at 8:57pm.

A record player is spinning at 32 rpm when the motor is switched off. After 6.8 seconds the angular speed has decreased to 20 rpm. Calculate the frictional torque if the record player can be treated as a solid wheel of mass 2.4 kg and radius 15 cm.
A) 476.47059 Nm
B) 0.00499 Nm
C) 0.01907 Nm
D) 952.94118 Nm
E) 0.04765 Nm

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