volume_mute
Calculating Buoyancy in Air
publish date: 2026/05/20 22:17:25.636346 UTC
A rigid, sealed sphere has a total volume of \(10\text{ ft}^3\). If the weight density of the surrounding air is exactly \(0.08\text{ lb/ft}^3\), calculate the upward buoyant force acting on the sphere.
Answer = (1)
Correct Answer
(1) 0.8
Explanation
By Archimedes' principle, the buoyant force equals the weight of the displaced fluid:
\[ F_b = \text{Volume} \times \text{Weight Density of Fluid} \]
\[ F_b = 10\text{ ft}^3 \times 0.08\text{ lb/ft}^3 = 0.8\text{ lb} \]
Reference
Basic Physics: A Self-Teaching Guide