A man is throwing rocks off a boat floating in the middle of a lake. The rocks sink quickly to the bottom of the lake.
Does the water level in the lake rise, fall, or stay the same after the rocks are thrown off the boat and sink to the bottom of the lake?
This question was asked in an actual mechanical engineering interview.
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Consider Archimedes’ principle and how the rocks affect the water level while they are on the boat vs. how the rocks affect the water level when they are in the lake.