A-LevelPhysicsWork, energy and power9702/12 · Oct/Nov 2014 · Q151 Mark

A small electric motor is mounted on a bench, as shown. The motor is connected to a 6.0V supply and the current in the motor is 0.50A. The motor is 50% efficient. [Figure 15.1] What is the time taken to lift a mass of 200 g up through a height of 90 cm?

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A0.59 s

B0.85 s

C1.2 s

D2.7 s

✓ Correct answer

C: 1.2 s

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Topic: Work, energy and power, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2014 Paper 1 Variant 2, question 15.

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