A crate is lifted from the ground to a platform using two different hoist systems, System X and System Y. System X takes 12 seconds12 \text{ seconds}12 seconds to lift the crate. The useful work done by System X is WWW, and the useful power developed is PPP. System Y takes 8 seconds8 \text{ seconds}8 seconds to lift the identical crate to the same platform.
Which row in the table correctly describes the useful work done and the useful power developed by System Y?
| Useful work done by System Y | Useful power developed by System Y | |
|---|---|---|
| A | WWW | less than PPP |
| B | WWW | more than PPP |
| C | more than WWW | less than PPP |
| D | more than WWW | more than PPP |
Useful work done: WWW; Useful power developed: less than PPP
Useful work done: WWW; Useful power developed: more than PPP
Useful work done: more than WWW; Useful power developed: less than PPP
Useful work done: more than WWW; Useful power developed: more than PPP
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.