A submarine dives to a depth of 181 feet in the ocean. What is the force (in pou

Question

A submarine dives to a depth of 181 feet in the ocean. What is the force (in pounds) acting on a hatch that has an area of 4.1 square feet? WARNING: do not use the information associated with Figure 4.27 to solve this problem because the round off error will cause you to get the wrong answer. Do not consider atmospheric pressure in your calculation, since the pressure inside of the submarine is maintained at 1 atmosphere, which offsets the 1 atmosphere of pressure that normally would be added to the gauge pressure.

Explanation / Answer

Quick answer:
Every 32ft of sea water equals one atmosphere (15 psia), so 181 / 32 = 5.65625 * 15 = 84.84 PSIA
144 * 4.1 = (590.4 in^2) * 84.84 = 50,091 pounds force. (answer)


Note: doesn't matter what pressure inside the submarine, force (colume of (H2O) is always there.

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