Discussion
A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will
Answer: B
The water level will decrease.
In the boat, each rock displaces its own weight of water; sunk on the bottom, it displaces only its own volume. Since the rocks are denser than water, the volume is the smaller of the two, so the total displacement falls and the level drops.
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