I.) If the water is incomprehensible, what pressure does the water (only) exert

Question

I.) If the water is incomprehensible, what pressure does the water (only) exert at the bottom of the 75 meters tall tank?
II.) The answer to question above is called the: A. Gauge pressure B. Absolute pressure C. Atmospheric pressure A large vertical cylindrical tank of water about 75 meters tall is used by the US Navy to train submariners in techniques used to safely escape sunken submarines in shallow waters. The tanks are used for physiological experiments also. (See picture below Until very recently all submariners had to undergo a yearly physical test to show that they could escape from a depth of several hundred feet of water (without the use of any artificial breathing apparatus). The sailors enter an air lock and wait while the air pressure is increased until it equals the water pressure at the bottom of the tank. The bottom four feet of the air lock is filled with water. The door to the tank in then opened and the sailors take a final breath (of the high pressure air), swim out the door, and rise slowly to the surface. The trip to the surface takes several minutes. (During this time the swimmer exhales continuously.) The density of the water is 1000 kg/m3. One meter equals 3.28 feet.

Explanation / Answer

pressure exerted by wate>

d=density of water,

g=acceleraion due to gravity = 9.8m/s2

h=depth=75m

so, p = 1000x9.8x75=735000 Pa

=735 Kpa

II) this pressure is called gauge pressure. it is total or absolute pressure - atmospheric pressure

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