A large tank is lled with three liquids of densities ρ1, ρ2 and ρ3 up to heights of h1, h2 and h3 respectively. What will be the expression for the instantaneous velocity of discharge through a small opening at the base of the tank? (assume that the diameter of the opening is negligible compared to the height of the liquid column)
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This interesting question is from Hydrostatic Force on Plane Area in portion Hydrostatic Forces on Surfaces of Fluid Mechanics