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Physics (AS & A Level) · Feb / March 2019 · Paper 12 · Question 11

9702Density and pressure

A ball falls through a liquid at a constant speed. It is acted upon by three forces: an upthrust, a drag-force and its weight. Which statement is correct?

  1. AThe drag-force increases with increasing depth.
  2. BThe drag-force is equal to the sum of the upthrust and weight.
  3. CThe upthrust is constant with increasing depth.
  4. DThe weight is greater than the sum of the drag-force and the upthrust.

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Correct answer: C. The upthrust is constant with increasing depth.

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