A construction crane lifts a concrete block of mass vertically at a constant speed
PHYSICS · Subjective · GCSE · Physics · Energy · Energy
Problem
A construction crane lifts a concrete block of mass 100kg vertically at a constant speed.
(i) Calculate the power required to raise the block at 0.60ms−1 (take g=9.8ms−2).
(ii) If the crane’s motor can supply a maximum power of 1.0kW under these conditions, determine the greatest constant speed at which it can raise the same block.
(iii) Explain why, for a given load, the power needed is directly proportional to the lifting speed.