Consider an object floating on a pool of water. Suppose much oil is poured onto the water and now floats above the water, with the object floating with part surrounded by a layer of oil and the lower part still in water. How has the buoyant force on the object changed by the oil layer?
A) increased
B) decreased
C) remained the same

Question

Quizplus · Accepted Answer

The buoyant force on an object is determined by the volume of fluid it displaces, not by the type of fluid. Since the volume of the object submerged in the fluid (water and oil combined) hasn't changed, the buoyant force remains the same.

Consider an Object Floating on a Pool of Water