Answer: 0.4 (40%).
- A 0.4 (40%)
- B 0.6 (60%)
- C 0.5 (50%)
- D 0.1 (10%)
Correct answer: A. 0.4 (40%)
Explanation: For floating: ρ_object / ρ_water = V<sub>submerged</sub> / V<sub>total</sub>. 0.6/1.0 = V<sub>sub</sub>/V = 0.6. Fraction submerged = 60%. Fraction above = 40%.
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.