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1.7 Energy, work and power

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Question 33

A window cleaner uses a motorized cradle to reach a window. The motor takes 6.3 s6.3\text{ s}6.3 s to lift the window cleaner and their equipment, which have a combined mass of 80 kg80\text{ kg}80 kg, a vertical height of 4.5 m4.5\text{ m}4.5 m. The power supplied to the cradle by its electric motor is 1.6 kW1.6\text{ kW}1.6 kW. What is the efficiency of the motorized cradle? (Take g=9.8 m/s2g = 9.8\text{ m/s}^2g=9.8 m/s2)

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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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