In a Millikan oil-drop experiment the terminal velocity of the droplet is observed to be 1.3 mm/s. The density of the oil is ρ= 900 kg/m3, and the viscosity of air is η = 1.82 × 10-5 kg/m . s. Use the results of the two previous problems to calculate (a) the droplet radius, (b) the mass of the droplet, and (c) the coefficient of friction.
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