2025 · Q27
A metallic sphere of mass 1 kg and volume 2 × 10⁻⁴ m3 is completely immersed in water. The buoyant force exerted by water on the sphere is:
(Given: density of water = 1000 kg/m3, g = 10 m/s2)
General KnowledgePhysics
- A0.5 N
- B1.5 N
- C2 N
- D2.5 N
Explanation
The buoyant force equals the weight of the displaced water: F = rho x V x g = 1000 x 2x10^-4 x 10 = 2 N. The body is therefore pushed up with a force of 2 newton. If the body's own weight exceeds 2 N it will sink; if it equals 2 N, it floats.