A powered system pulls a piece of theatre scenery across a stage. During each movement, the system exerts a constant force of 480 N through a distance of 15 m in the direction of motion.
Servicing increases the efficiency of the system from 0.60 to 0.75. The system performs 18 of these movements during a performance.
Calculate the decrease in the total energy supplied to the system during the performance as a result of the servicing.
128 exam-style questions on Edexcel GCSE Physics 8.3 Power and efficiency, covering 8.3.1 Power and 8.3.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.