PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
Two construction cranes, A and B, are used to lift concrete blocks vertically at a building site.
• Crane A lifts a 200kg block through a height of 15m in 25s.
• Crane B lifts a 250kg block through a height of 12m in 30s.
Answer the following questions.
(i) Calculate the work done by each crane on the block it lifts.
(ii) Determine the average power developed by each crane while lifting.
(iii) Which crane is more powerful? Support your answer with suitable calculations.