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JEE PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS

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Application +4 | -1

Eight small raindrops each of radius

1 {~mm}

, come down with a terminal velocity of

10 {~cm} / {s}

. They coalesce to form a bigger drop. The terminal velocity of the bigger drop will be

View answer and explanation

Correct option: D

40 {~cm} / {s}

Option D (

40 {~cm} / {s}

) is correct because the terminal velocity is proportional to the square of the radius, and the radius doubles when eight drops coalesce.

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