A large tank is filled with water to a depth of d = 18 m. A spout located h = 13 m above the bottom of the tank is then opened as shown in the drawing. With what speed will water emerge from the spout?

Answer 1

The pressure of water at the hole location is

P = (rho)gH + Po

where Po is atmospheric pressure

The Bernoulli equation tells you that

(1/2)(rho) V^2 = P - Po = (rho) g H

The water density (rho) cancels out, so

V = sqrt (2 g H)

H is this case the the height of water ABOVE the hole, which is 5 m, not h=13 m

Answer 2

9.8