A-LevelPhysicsWork, energy and power9702/12 · Feb/Mar 2022 · Q161 Mark

An escalator is 60 m long and lifts passengers through a vertical height of 30 m, as shown. [Figure 16.1] To drive the escalator against the forces of friction when there are no passengers requires a power of 2.0 kW. The escalator is used by passengers of average mass 60 kg and the power to overcome friction remains constant. How much power is required to drive the escalator when it is carrying 20 passengers and is travelling at 0.75 ms⁻¹?

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A4.4 kW

B6.4 kW

C8.8 kW

D10.8 kW

✓ Correct answer

B: 6.4 kW

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Topic: Work, energy and power, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2022 Paper 1 Variant 2, question 16.

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