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Question

Deep water runs almost still. What does it explain?


A

Surface energy

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B

Equation of continuity

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C

Magnus effect

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D

Bernoulli's Theorem

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Solution

The correct option is B

Equation of continuity


Let water be flowing in a river of width b. Let d1 and d2 (d1 < d2) be the depth of the river at two different places and V1 and V2 be the velocity of water at those places respectively.

So according to equation of continuity, we have

A1V1 = A2V2

or b d1V1 = b d2V2

or d1V1 = d2V2

since d1 < d2, V1 > V2

that is, where depth is more, speed is less and vice versa. Hence, deep water runs slow.


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