Question

What is the efficiency of her body when a cyclist expends 1000 w of power to deliver mechanical energy to the bicycle at the rate of 100w?

Answer 1

Given:  Energy input = 100 W

            Energy output = 1000 W

Formula: Efficiency = Energy Output/Energy Input  x 100 %

               Efficiency = 100 W/1000 W  x 100 %

               Efficiency = 10 %