Discussion
The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by
Answer: A
This is explained by Bernoulli's principle.
Water forced through the narrow gap between the hulls speeds up, and where the speed rises the pressure falls: \[P + \tfrac{1}{2}\rho v^2 + \rho gh = \text{constant}\] The pressure on the outer sides then exceeds that between them, pushing the ships together. The same effect makes a passing express train tug at a person on the platform.
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