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
95 exam-style questions on CIE IGCSE Physics 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.