A skier travels to the top of a ski slope using either Ski Lift A or Ski Lift B.
Ski Lift A takes 5 minutes5\text{ minutes}5 minutes to carry the skier to the top. The useful work done against gravity is WWW, and the useful power developed is PPP.
Ski Lift B takes 4 minutes4\text{ minutes}4 minutes to carry the same skier to the top.
Which row in the table correctly identifies the useful work done against gravity and the useful power developed by Ski Lift B?
| Useful work done against gravity by Ski Lift B | Useful power developed by Ski Lift B | |
|---|---|---|
| A | WWW | less than PPP |
| B | WWW | more than PPP |
| C | more than WWW | more than PPP |
| D | WWW | PPP |
Useful work: WWW; useful power: less than PPP
Useful work: WWW; useful power: more than PPP
Useful work: more than WWW; useful power: more than PPP
Useful work: WWW; useful power: PPP
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.