A ski resort uses an electric chairlift to transport skiers up a mountain slope. All skiers are assumed to have the same mass. During a busy period, the operators increase the speed of the motor so that more skiers are carried up the slope in a given time.
How does this speed increase affect the work done in transporting each skier up the mountain, and the useful output power of the motor?
Work done on each skier increases, useful output power decreases
Work done on each skier increases, useful output power increases
Work done on each skier is unchanged, useful output power decreases
Work done on each skier is unchanged, useful output power increases
533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.