Derive the expression for viscous force acting on spherical body of radius r moving with velocity v through viscous liquid of coefficient of viscosity η.
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Derive an expression for the rate of flow of non-viscous liquid of density ρ through a conical pipe or radii r and r1 (r1 > r2) when pressure difference of P is maintained across its ends.
Let P1, a1 and v1 be the pressure, cross sectional area and velocity at end A respectively and P2, a2 and v2 be the same quantites at end B.