A powered stage truck moves scenery across a theatre. During one movement, the drive pulls the truck through 14 m against a steady force of 1800 N. The movement takes 35 s. Of the total energy supplied to the drive, 30% is dissipated in unwanted transfers.
Calculate the mean input power of the drive during the movement.
Give your answer in kilowatts.
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.