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1.7 Energy, work and power

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Question 250

A crane lifts a container from the ground to a raised platform in 15 s. The useful work done against gravity is WWW, and the useful power developed is PPP. Extraordinarily, a second crane lifts the same container from the ground to the same platform in 10 s. Which of the following statements is correct regarding the second crane?

A

The useful work done is WWW, and the useful power developed is more than PPP.

B

The useful work done is WWW, and the useful power developed is less than PPP.

C

The useful work done is more than WWW, and the useful power developed is more than PPP.

D

The useful work done is more than WWW, and the useful power developed is 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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