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1.7 Energy, work and power

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Question 436

A conveyor belt and a crane are both used to lift a cargo crate from ground level to a platform.

The conveyor belt takes 45 s to lift the crate. The useful work done on the crate is WWW, and the average useful power developed by the conveyor belt is PPP.

The crane takes 15 s to lift the same cargo crate from ground level to the same platform.

Which of the following describes the useful work done by the crane and the average useful power developed by the crane?

A

Useful work is less than WWW, useful power is more than PPP

B

Useful work is WWW, useful power is more than PPP

C

Useful work is WWW, useful power is less than PPP

D

Useful work is more than WWW, useful power is 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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