Buoyancy: a Piece of Wood Is Floating in a Bathtub

Multiple Choice

Buoyancy: 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) This cannot be determined without knowing the volume of the top piece of wood.