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When you scuba dive, the added pressure due to the water varies directly with your depth. At 20 feet, the added pressure is about 9 pounds per square inch.

a) If an amateur diver can safely stand an added pressure of 30 (psi), how deep could he dive?

b) A sunken submarine lies in 120 feet of water. How much added pressure would a diver experience in going to the submarine?

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