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Physics (AS & A Level) · May / June 2016 · Paper 11 · Question 17

9702Energy conservation

The power P required to move an object through a medium at constant speed depends on the speed v and the resistive force F acting on the object. The resistive force F also depends on the speed v. Which row shows a possible relationship between speed v, resistive force F and power P?

  1. Aresistive force F proportional to v; power P constant
  2. Bresistive force F proportional to v; power P proportional to v
  3. Cresistive force F proportional to v^2; power P proportional to v^2
  4. Dresistive force F proportional to v^2; power P proportional to v^3

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Correct answer: D. resistive force F proportional to v^2; power P proportional to v^3

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