Steady rain, giving 5 mm an hour, turns suddenly into a downpour giving 20 mm an hour and the speed of the rain drops falling vertically on to a flat roof simultaneously doubles. The pressure exerted by the falling rain on the roof is raised by a factor of

Question

Dr. Abubacker · Accepted Answer

(b) We know that $F = v\frac{dm}{dt}$
$\frac{dm}{dt}$ is increased by a factor of 4 and $v$ is doubled
So, $F$ is increased by a factor of 8

Q. Steady rain, giving 5 mm an hour, turns suddenly into a downpour giving 20 mm an hour and the speed of the rain drops falling vertically on to a flat roof simultaneously doubles. The pressure exerted by the falling rain on the roof is raised by a factor of

Explanation

Reviewed by Dr. Abubacker

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