Imagine holding two identical bricks under water. Brick A is just beneath the surface of the water, while brick B is at a greater depth. The force needed to hold brick B in place is...
A) larger than
B) the same as
C) smaller than
the force required to hold brick A in place.
Solution: B. The buoyant force on each brick is equal to the weight of water it displaces and does not depend on depth. None of the variables in the formula Fb = ρfVdg change significantly with depth below the surface.