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1.7 Energy, work and power

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Question 34

An electric motor lifts a constant load to a vertical height of 5.0 m four times. The time taken for each lift is shown in the options below.

Which time corresponds to the greatest average useful power output by the motor?

A

4.0 s4.0\text{ s}4.0 s

B

8.0 s8.0\text{ s}8.0 s

C

12.0 s12.0\text{ s}12.0 s

D

16.0 s16.0\text{ s}16.0 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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