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Vandaag is het 19 November 2018

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Boat and stone - science puzzle

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Suppose you sit in a rubber boat in a swimming pool. In the boat lies a stone. You throw this stone from the boat into the pool. Will the water level in the pool raise or drop?

Explanation

For a floating body it holds that the weight of the volume of displaced water is equal to the weight of the floating body.
A body which is sunk displaces as many water as its volume.
Since the density of stone is larger than the density of water (which means that 1 litre of stone weights more than one litre of water) the water level will drop if the stone is thrown into the pool.