A turntable must spin at 33.3 rev/min (3.49 rad/s) to play an old-fashioned vinyl record. How much torque must the motor deliver if the turntable is to reach its final angular speed in 2.30 revolutions, starting from rest? The turntable is a uniform disk of diameter 30.5 cm and mass 0.250 kg.

__N?m

Four masses are arranged as shown. They are connected by rigid, massless rods of lengths 0.840m and 0.500 m. What torque must be applied to cause an angular acceleration of 0.750 rad/s²about the axis shown?

A B A 4.00 kg m B 3.00 kg Axis C 5.00 kg D 2.00 kg D C 0.500 m