Total pressure combines atmospheric and hydrostatic components

Steps:

• Calculate hydrostatic pressure: ρgh = (1000 kg/m³)(9.8 m/s²)(8.0 m) = 78400 Pa.
• Add atmospheric pressure: 100000 Pa + 78400 Pa = 178400 Pa ≈ 178000 Pa.
• Round to match choice precision.

Why D is correct:

• Pascal's law states total pressure at depth is atmospheric pressure plus ρgh, yielding 178000 Pa.

Why the others are wrong:

• A: Overestimates by adding extra hydrostatic pressure.
• B: Underestimates as only hydrostatic pressure minus atmospheric.
• C: Underestimates by averaging or halving components.

Final answer: D