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1.7 Energy, work and power

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Question 194

Two different lifting systems, System X and System Y, are used to lift the same container from the ground level to the top shelf of a warehouse.

System X takes 40 s to lift the container. The useful work done on the container by System X is WWW, and the useful power developed is PPP. System Y takes 25 s to lift the same container to the same shelf.

Which of the following correctly describes the useful work done and the useful power developed by System Y?

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: less than WWW, useful power: less than 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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