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A tank with a large cross-sectional area contains motor oil of density 889kg/m^3 and a depth...

A tank with a large cross-sectional area contains motor oil of density 889kg/m^3 and a depth of 1.2m. The top of the tank is open to the atmosphere. A narrow horizontal pipe of radius 1.6mm and length 1.0m leaves the tank at the bottom. Determine the average speed of the oil flowing in the pipe if:

a) the viscosity of the oil is neglected

b) the viscosity (0.17Pas) is included

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