volume_mute
Calculating Buoyant Force
publish date: 2026/05/18 21:36:2.514063 UTC
Water has a weight density of approximately \(62.4\text{ lb/ft}^3\). If a solid cube with a volume of \(2\text{ ft}^3\) is held completely underwater, calculate the upward buoyant force acting on it.
Answer = (1)
Correct Answer
(1) 124.8
Explanation
By Archimedes' principle, the buoyant force equals the weight of the displaced water.
\[ F_b = \text{Volume} \times \text{Weight Density} \]
\[ F_b = 2\text{ ft}^3 \times 62.4\text{ lb/ft}^3 = 124.8\text{ lb} \]
Reference
Basic Physics: A Self-Teaching Guide