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1.7 Energy, work and power

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Question 432

Two different electric hoists, Hoist X and Hoist Y, are used to lift the same heavy crate from the ground to a platform.

Hoist X takes 15 s to lift the crate. The useful work done is WWW, and the useful power developed is PPP.

Hoist Y takes 10 s to lift the same crate to the same platform.

Which of the following correctly describes the useful work done and the useful power developed by Hoist 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: less than PPP

D

Useful work: more than WWW; Useful power: more 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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