Physics
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

Newton's third law of motion
Magnetic properties of the ship's material
Bernoulli's principle
Earth's gravitational force

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Physics
It is easier for a man to swim in sea water, than in river water because

The density of sea water is more than the density of river water
The sea is-deeper than the river
The density of sea water is lesser than the density of river water
The sea is wider than the river

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