A painter of mass needs to lift a bucket of paint of mass from the ground to a…
PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A painter of mass 65kg needs to lift a bucket of paint of mass 15kg from the ground to a platform 5m high using a light, strong rope.
(i) Derive an expression for the work done in lifting a body of mass m vertically through a height h at constant speed.
(ii) Using your expression, calculate the separate amounts of work the painter must do on (a) himself and (b) the bucket to reach the platform.
(iii) Find the total work done and express the result in both joule and kilojoule.
(iv) If the painter completes the lift in 25s, determine the average power developed during the process.