Question

A ball weighing 4 kg of density 4000 kg m^–3 is completely immersed in water of density 103 kg m^–3 Find the force of buoyancy on it. (Given g = 10 m s^–2)

Answer 1

Here, Mass of the ball, m = 4 kg Density of ball, ρ = 4000 kg m^–3 Density of water σ = 10³ kg m^–3 

∴ Volume of ball = `"m"/"ρ" = (4"kg")/(4000 "kg m" ^-3)`

= 10^–3  m³

So force to buoyney on the ball

= V σ g = 10^–3 × 10³ × 10 

= 10 N