A-LevelPhysicsWork, energy and power9702/12 · Feb/Mar 2020 · Q181 Mark

A car travels at a constant speed of 25 ms¯¹ up a slope. The wheels driven by the engine exert a forward force of 3000 N. The total force due to air resistance and friction is 2100 N. The weight of the car has a component down the slope of 900 N. What is the rate at which thermal energy is dissipated?

Azero

B2.3 × 104 W

C5.3 × 104 W

D7.5 × 104 W

✓ Correct answer

C: 5.3 × 104 W

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Topic: Work, energy and power, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2020 Paper 1 Variant 2, question 18.

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