What depth yields a total pressure of 60.9 psi?

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Multiple Choice

What depth yields a total pressure of 60.9 psi?

Explanation:
Total pressure at depth equals atmospheric pressure plus the water pressure from the depth. At the surface, atmospheric pressure is about 14.7 psi. The water pressure increases roughly 0.445 psi for every foot of seawater, so the total pressure at depth h is about 14.7 + 0.445h. Set this equal to 60.9 psi and solve: 60.9 − 14.7 = 0.445h, which gives 46.2 ≈ 0.445h, so h ≈ 103.8 ft. Rounding to a practical depth, about 105 ft fits best. Check: 100 ft gives roughly 14.7 + 0.445×100 ≈ 59.2 psi; 105 ft gives ≈ 61.4 psi; 90 ft ≈ 54.8 psi; 120 ft ≈ 68.1 psi. So 105 feet yields a total pressure near 60.9 psi.

Total pressure at depth equals atmospheric pressure plus the water pressure from the depth. At the surface, atmospheric pressure is about 14.7 psi. The water pressure increases roughly 0.445 psi for every foot of seawater, so the total pressure at depth h is about 14.7 + 0.445h.

Set this equal to 60.9 psi and solve: 60.9 − 14.7 = 0.445h, which gives 46.2 ≈ 0.445h, so h ≈ 103.8 ft. Rounding to a practical depth, about 105 ft fits best.

Check: 100 ft gives roughly 14.7 + 0.445×100 ≈ 59.2 psi; 105 ft gives ≈ 61.4 psi; 90 ft ≈ 54.8 psi; 120 ft ≈ 68.1 psi. So 105 feet yields a total pressure near 60.9 psi.

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