A gardener pushes a lawn roller and performs a certain amount of mechanical work.
PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A gardener pushes a lawn roller and performs a certain amount of mechanical work.
(i) The gardener does 7200J of work in 6min. Calculate the average power developed.
(ii) The next day, the gardener takes only 5min to do the same amount of work. Determine the percentage increase in average power compared to part (i).
(iii) State whether the power obtained in part (i) is less than or greater than 0.05kW and justify your answer with a numerical comparison.