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Physics (AS & A Level) · Oct / Nov 2020 · Paper 13 · Question 11

9702Non-uniform motion

An air bubble is rising through a liquid at a constant speed. The forces on it are the upthrust U, the viscous drag V and its weight W. Which diagram shows the directions and relative sizes of the forces?

  1. AU upward (long), W downward (short), V downward (long)
  2. BU upward (long), W downward (short), V downward (short)
  3. CU upward (long), V downward (short), W downward (long)
  4. DV upward (short), U upward (long), W downward (long)

As printed in the paper

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Correct answer: A. U upward (long), W downward (short), V downward (long)

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