Question

A sealed tank containing seawater to a height of 11.0 m also contains air above the water at a gauge pressure of 3.00 atm. Water flows out from the bottom through a small hole. How fast is this water moving?

Is it true that the initial pressure is 3atm + 1atm, if so why? is it because when the container is sealed there is still air in it BEFORE you seal it. And then when you seal it you apply the pressure (3atm) but in addition to that there is air pressure?

Answer #1

Initial pressure inside is given by following (remember following relation)

P_{initial absolute} =
P_{atm}+P_{gauge}= (1+3)atm.

No need to think about how they pressurised it . Focus on the situation.

Apply bernoulli equation at interface between water and air in tank and exit.

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