A piece of wood is floating in a bathtub.A second piece of wood sits on top of the first piece,and does not touch the water.If the top piece is taken off and placed in the water,what happens to the water level in the tub?
A)It goes up.
B)It goes down.
C)It does not change.
D)It cannot be determined without knowing the volumes of the two pieces of wood.

Question

Quizplus · Accepted Answer

The water level in the tub is determined by the total volume of the pieces of wood and any other objects in the tub. Since the second piece of wood was already sitting on top of the first piece and not touching the water, its volume was already accounted for in the original water level. When it is placed in the water, it displaces an equal volume of water, so the water level stays the same.

A Piece of Wood Is Floating in a Bathtub