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Determine the radius of a drop of rain falling through air with terminal velocity 0.12 ms–1. Given η = 1.8 × 10–5 kg m–1 s–1, ρ = 1.21 kg m–3, σ = 1.0 × 103 kg m–3 and g = 9.8 m s–2.

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 We know that terminal velocity is given by

On rearranging terms, we can write

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