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1.7 Energy, work and power

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Question 365

An electric winch takes 2.5 minutes2.5\text{ minutes}2.5 minutes to lift a 600 kg load to a height of 14 m.

What is the average useful power developed against gravity by the winch?

(Take the acceleration of free fall, ggg, to be 9.8 m/s2.)

A

22 W22\text{ W}22 W

B

56 W56\text{ W}56 W

C

550 W550\text{ W}550 W

D

33 kW33\text{ kW}33 kW

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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