Question

Two spheres of the same outer diameter, one solid and the other hollow, are completely immersed in the water. We can affirm:

a) The hollow receives less push
b) The hollow receives more push
c) Both receive the same push
d) The solid receives less push

Answer 1

c) Both receive the same push

Explanation:

The buoyancy force is equal to the weight of the displaced fluid:

B = ρVg

where ρ is the density of the water, V is the volume of displaced water, and g is the acceleration due to gravity.

Since both spheres displace the same amount of water, they have equal buoyancy forces.