An elevator car of mass 1.20 × 10³ kg is lifted vertically upward through a distance…
PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
An elevator car of mass 1.20 × 10³ kg is lifted vertically upward through a distance of 15.0 m in 12.0 s at constant speed by an electric motor.
(a) Calculate the average mechanical power that the motor must deliver to the elevator car during the lift.
(b) The motor operates with an overall efficiency of 75%. Determine the average electrical power that must be supplied to the motor during the lift.