A piece of iron rests on top of a piece of wood floating in a bathtub. If the iron is removed from the wood, and kept out of the water, what happens to the water level in the tub?
A) It goes up.
B) It does not change.
C) It goes down.
D) It is impossible to determine from the information given.

Question

Quizplus · Accepted Answer

When the iron is on the wood, it causes the wood to displace more water than it would on its own, due to the added weight. Removing the iron reduces the overall weight on the wood, decreasing the water displacement and thus lowering the water level.

A Piece of Iron Rests on Top of a Piece