Two boats moving parallel in the same direction:
Correct answer: A. Will be pulled towards each other
- A. Will be pulled towards each other
- B. Will drift apart from each other
- C. Will have no effect on each other
- D. Will experience random motion
Explanation
As the speed of water between the ships is greater than outside them, pressure between them gets reduced, and pressure outside is greater, so the excess pressure pushes the ships closer to each other, therefore they get attracted to each other and are pulled towards each other.
This question appeared on the ETEA MDCAT 2006 paper, which you can sit online with every answer explained.
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Fluid flow covers pressure, density, viscosity and the motion of liquids and gases through pipes or open channels. It includes the continuity equation, Bernoulli equation, streamline and turbulent flow, and the effects of changing area, height and speed. Viscosity and ideal fluid assumptions must not be confused with pressure effects.
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