Answer: The volume of the object (not its weight or density).
- A The volume of the object (not its weight or density)
- B The weight of the object in air before submersion
- C The chemical composition or material of the object
- D Only the geometric shape of the object, regardless of size
Correct answer: A. The volume of the object (not its weight or density)
Explanation: Buoyant force = ρ_fluid × V<sub>submerged</sub> × g. It depends on the density of the fluid and the volume submerged, NOT on the object weight, material, or shape.
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.