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Physics (AS & A Level) · May / June 2019 · Paper 12 · Question 12

9702Equilibrium of forces

A submarine descends vertically at constant velocity. The three forces acting on the submarine are viscous drag, upthrust and weight. Which relationship between their magnitudes is correct?

  1. Aweight < drag
  2. Bweight = drag
  3. Cweight < upthrust
  4. Dweight > upthrust

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Correct answer: D. weight > upthrust

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