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Suppose the average mass of raindrops is 3.0 × 10-5 kg 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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Answer» Give : m = 3.0 × 10-5 kg, ρ = 1.0 × 103 kg/m3 v = 9 m/s A = 1m2 h = 100 cm ⇒ V = 1m3 M = ρV = 103 kg, Energy transferred by rain, E = \(\frac{1}{2}\)mv2 = \(\frac{1}{2}\) × 103 × (9)3 = 4.05 × 104 J. |
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