PHYSICS · Multi-part · CBSE · Physics · Work and Energy · Work and Energy
Problem
Two cranes, A and B, are used at a construction site to lift concrete blocks to a height of 15m.
(i) Crane A lifts 30 blocks, each of mass 500kg, to the required height in 1h. Calculate the total work done by crane A.
(ii) Crane B lifts 20 blocks, each of mass 800kg, to the same height in 30min. Calculate the total work done by crane B.
(iii) Determine the average power output of each crane in kilowatts.
(iv) Which crane is more powerful, and by what factor is it more powerful?
(v) Convert the power of the more powerful crane obtained in part (iii) to horsepower, taking 1hp=746W.