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1.7 Energy, work and power

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Question 377

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 BUseful power developed by Ski Lift B
AWWWless than PPP
BWWWmore than PPP
Cmore than WWWmore than PPP
DWWWPPP
A

Useful work: WWW; useful power: less than PPP

B

Useful work: WWW; useful power: more than PPP

C

Useful work: more than WWW; useful power: more than PPP

D

Useful work: WWW; useful power: PPP

Markscheme

1.7 Energy, work and power Questions

  1. IGCSE
  2. /Physics
  3. /1.7 Energy, work and power

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.

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