A 250 g , 25-cm diameter plastic disk is spun on an axle through its...
A 250 g , 25-cm diameter plastic disk is spun on an axle through its center by an electric motor. What torque must the motor supply to take the disk from 0 to 1900 rpm in 4.7 s ? Express your answer in newton-meters.
Answer & Explanation
Mass of the disc, m = 250 g = 0.25 kg
Diameter of the disc, d = 25 cm = 0.25 m
Disc rotate from 0 to 1900 rmp, in t = 4.7 sec.
Moment of inertia of the disc
The torque is