A small electric hoist is used in the school laboratory
PHYSICS · Multi-part · CBSE · Physics · Work and Energy · Work and Energy
Problem
A small electric hoist is used in the school laboratory.
It lifts a wooden block of mass 20kg vertically through a height of 6m in 10s at constant speed.
(i) Calculate the work done on the block.
(ii) Calculate the power developed by the hoist while lifting the block.
(iii) How much time would the hoist take to lift the same block through the same height if its power rating is reduced to one-half of the value obtained in part (ii)? (Assume the speed of lifting remains constant.)