Suppose you have an aquarium and you notice that you have a solid plastic decoration and a rock of about the same mass but the decoration is twice as large as the rock. 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 depends on the volume of the displaced fluid. Since the plastic decoration is twice as large in volume as the rock, it displaces twice as much water, resulting in a buoyant force that is twice as big.

Suppose You Have an Aquarium and You Notice That You