An electric motor is used to lift a cargo container of weight G G\,G to a storage platform at a height h h\,h using two different transport mechanisms:
Which row in the table correctly identifies the useful work done against gravity and the useful power developed by Mechanism 2?
| Useful work done against gravity by Mechanism 2 | Useful power developed by Mechanism 2 | |
|---|---|---|
| A | more than WWW | less than PPP |
| B | more than WWW | equal to PPP |
| C | equal to WWW | less than PPP |
| D | equal to WWW | equal to PPP |
Useful work: more than WWW; Useful power: less than PPP
Useful work: more than WWW; Useful power: equal to PPP
Useful work: equal to WWW; Useful power: less than PPP
Useful work: equal to WWW; Useful power: equal to 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.