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Physics (AS & A Level) · Oct / Nov 2016 · Paper 12 · Question 20

9702Energy conservation

A car travels at a constant speed of 25 m s–1 up a slope. The wheels driven by the engine exert a forward force of 3000 N. There is a drag force due to air resistance and friction of 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?

  1. Azero
  2. B2.3 × 10^4 W
  3. C5.3 × 10^4 W
  4. D7.5 × 10^4 W

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Correct answer: C. 5.3 × 10^4 W

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