Suppose you have an aquarium and you notice that you have a solid plastic decoration and a rock of about the same volume but twice as dense, and both are totally submerged in the water. The buoyant force on the plastic object is about ___________as that on the rock.
A) twice as big.
B) the same.
C) half as big.
D) one quarter as big.

Question

Quizplus · Accepted Answer

The buoyant force on an object submerged in a fluid depends on the volume of fluid displaced by the object, not its density. Since both the plastic decoration and the rock have about the same volume and are totally submerged, they displace the same amount of water and thus experience the same buoyant force.

Suppose You Have an Aquarium and You Notice That You