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1.7 Energy, work and power

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Question 323

Four electric hoists do the same quantity of work when they lift a load of weight 25 N through the same vertical height.

The times taken by each hoist to lift the load are:

  • Hoist W: 2.0 s
  • Hoist X: 8.0 s
  • Hoist Y: 20 s
  • Hoist Z: 80 s

What is the time taken by the hoist that produces the most power?

A

2.0 s2.0\text{ s}2.0 s

B

8.0 s8.0\text{ s}8.0 s

C

20 s20\text{ s}20 s

D

80 s80\text{ s}80 s

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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