The volume of a sphere:
The diameter of raindrop, d = 3.2 mm (1m/1000mm) = 0.0032 m
r = d/2 = 0.0032/2 = 0.0016 m
mass, m = ρwater•V = 1000 × (4/3)π × (0.0016)3 = 1.716 × 10-5 kg
Cross sectional area, A = πr2 = π(0.0016)2 = 8.042 × 10-6 m2
Calculate the velocity of a spherical raindrop falling from 5.4 km.
Take the size across the rain drop to be 3.2 mm, the density of air to be 1.25 kg/m3, density of water to be 1000 kg/m3, the surface area to be πr2, and the drag coefficient to be 1.0.
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