Answer: 0.735 m (73.5 cm).
- A 0.735 m (73.5 cm)
- B 10 m according to standard textbooks
- C 13.6 m in general practice
- D 1 m as frequently described
Correct answer: A. 0.735 m (73.5 cm)
Explanation: P = ρgh → h = P/(ρg) = 10⁵/(13600 × 10) = 10⁵/1.36×10⁵ ≈ 0.735 m = 73.5 cm ≈ 760 mmHg.
Since the same volume of fluid must pass every cross-section per second (continuity), the fluid speeds up where the pipe narrows; Bernoulli's equation then says this faster-moving fluid has lower pressure - the principle behind a venturi meter and an aircraft wing's lift.
Concept context
Pressure, buoyancy, Bernoulli equation, viscosity, and surface tension.