(a) Define the physical quantity "power" and state its SI unit. (b) Does the average…
PHYSICS · Subjective · CBSE · Physics · Work and Energy · Work and Energy
Problem
(a) Define the physical quantity "power" and state its SI unit.
(b) Does the average power developed in doing a given amount of work depend only on the work done or does it also depend on the time taken? Explain with suitable reasoning.
(c) A labourer and an electrically operated crane can both lift identical concrete blocks of weight 800N to the roof of a building 5m high. Give two reasons, without any numerical calculation, why the crane is said to be more powerful than the labourer.