A small DC motor turns the platter of a record player
PHYSICS · Multi-part · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion
Problem
A small DC motor turns the platter of a record player. While the platter undergoes exactly 5.0 full revolutions from rest to its operating speed, the motor supplies 150J of mechanical energy to the platter.
(a) Calculate the magnitude of the constant torque the motor must have exerted on the platter during this spin-up interval. Show all steps leading to your numerical answer and include appropriate units.
(b) Interpret your result by explaining whether this torque magnitude is reasonable for a household record player. Base your discussion on typical everyday forces or torques you can reference.