Quote:
Originally Posted by Fat Abe
Down. While in the boat, the rock displaces a volume of water equal to the weight of the rock. (Archimedes Principle). In the water, the volume the rock displaces is equal to that of the rock. The answer depends on the rock having a greater density than the water. That is not true of all rocks, so then this becomes a trick question.
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As given, the only possible answer is the one you gave. The rock is described as sinking to the bottom of the tank of water. This would only happen if the rock is denser than the water.
If the rock were made of pumice, and so floated in the water, the water level would stay the same, as whether it was in the boat or in the water it would displace the same volume of water.