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 does not change.
B) It goes up.
C) It goes down.
D) It cannot be determined without knowing the volumes of the two pieces of wood.

Question

Quizplus · Accepted Answer

When the top piece of wood is placed in the water, it displaces its own weight in water, which is the same amount of water displaced when it was on top of the first piece of wood. Therefore, the water level does not change.

A Piece of Wood Is Floating in a Bathtub