At an airport, an electric conveyor belt is used to lift luggage bags from a lower loading deck to a registration counter. All of the luggage bags have the same mass.
During a rush hour, the operators increase the speed of the conveyor belt so that more bags are lifted up to the counter in a given time.
How does this change affect the work done in lifting each bag and the useful power output of the conveyor's motor?
Work done in lifting each bag: increases; Useful power output of the motor: decreases
Work done in lifting each bag: increases; Useful power output of the motor: increases
Work done in lifting each bag: no change; Useful power output of the motor: decreases
Work done in lifting each bag: no change; Useful power output of the motor: 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.