Two life preservers have identical volumes,but one is filled with Styrofoam while the other is filled with sand.When the two life preservers are worn by swimmers so that one swimmer floats with part of the preserver above water,and the other swimmer sinks,the buoyant force is actually greater on the life preserver filled with
A)Styrofoam.
B)sand.
C)same

Question

Quizplus · Accepted Answer

The buoyant force is equal to the weight of the water displaced by the object. Since the life preserver filled with sand sinks, it displaces more water than the one filled with Styrofoam, resulting in a greater buoyant force on the sand-filled preserver.

Two Life Preservers Have Identical Volumes,but One Is Filled with Styrofoam