Estimate the terminal speed of a wooden sphere (density 0.870 g/cm3) falling through air, if its radius is 8.50 cm and its drag coefficient is 0.500. (The density of air is 1.20 kg/m3.)

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Irving HeathcoteLv2

27 Jun 2019

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Air at 20°C flows through the tube as shown in the figure. Assume that air is an ideal fluid. The density of air is 1.20 kg/m³, the density of mercury is 13600 kg/m³. Suppose that d₁ = 3 mm and d₂ = 1.5 cm.

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