A boat loaded with rocks is floating in a swimming pool. If the rocks are thrown into the pool, the water level in the pool, after the rocks have settled to the bottom,
A) stays the same.
B) falls.
C) rises.

Question

Quizplus · Accepted Answer

When the rocks are in the boat, they displace a volume of water equal to their weight. After being thrown into the pool, they displace only their own volume, which is less than the volume of water they displaced when in the boat (assuming the rocks are denser than water). Therefore, the water level falls.

A Boat Loaded with Rocks Is Floating in a Swimming