A closed water tank has cross-sectional area A. It has a small hole at a depth of h from the free surface of water. The radius of the hole is r so that 
. If 
is the pressure inside the tank above water level, and 
is the atmospheric pressure, the rate of flow of the water coming out of the hole is [ 
is the density of water]
Text Solution
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Velocity of efflux for a tank is
(i)
where P is the pressure in the tank, 
is water density and h is elevation of the water surface above the outlet.
If 
is the pressure inside the tank above water level and 
is the atmospheric pressure, then pressure in the tank is, 
From eqn (i), we get
From equation of continuity, rate of flow of the water from the hole 
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