Sarthaks Test
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Suppose the average mass of raindrops is 3.0 × 10-5kg and their average terminal velocity 9 m s-1. Calculate the energy transferred by rain to each square metre of the surface at a place which receives 100 cm of rain in a year.

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m = 3.0 × 10–5 kg r = 10–3 kg/m2 v = 9 m/s

A = 1m2          h = 100 cm  n = 1m3 

M = ρv = 10–3 kg, E = (1/2)Mv2 = (1/2) x 103 x (9)2 = 4.05 x 104J.

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