An aluminium sphere is dipped into water. Which of the following is true? a) buoyancy will be less in water at 0oC than that in water at 4oC b) buoyancy will be more in the water at 0oC than that in water at 4oC c) buoyancy in water at 0oC will be same as that in the water at 4oC d) buoyancy may be more or less in water at 4oC depending on the radius of the sphere
Correct option is A) As buoyancy at 0oC,Fb=Vρ0g and buoyancy at 4oC,Fb′=Vρ4g Fb′Fb=ρ4ρ0<1(density of water at 4oC is maximum) i.e., Fb<Fb′
