PHYSICS · Multi-part · AP · Physics C: Mechanics · Work Energy and Power · Work Energy and Power
Problem
An electric lift has an empty mass of 500kg. It carries four passengers each of mass 65kg from the ground floor to a floor 15m higher in 10s while moving upward at constant speed. Assume g=9.8m s−2. Answer the following:
(a) Compute the total work done by the motor in lifting the loaded lift to the higher floor.
(b) Calculate the average power delivered by the motor during the ascent.
(c) The motor is rated at 10kW. Show by calculation whether this rating is adequate for the given task and state the margin of safety, if any.