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Physics (AS & A Level) · May / June 2020 · Paper 13 · Question 11

9702Density and pressure

A submarine is in equilibrium in a fully submerged position. What causes the upthrust on the submarine?

  1. AThe air in the submarine is less dense than sea water.
  2. BThere is a difference in water pressure acting on the top and on the bottom of the submarine.
  3. CThe sea water exerts a greater upward force on the submarine than the weight of the steel.
  4. DThe submarine displaces its own volume of sea water.

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Correct answer: B. There is a difference in water pressure acting on the top and on the bottom of the submarine.

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