Question

You are sitting in a rowboat on a small lake. you have a brick in your boat. you toss the brick out of your boat into the lake, where it quickly sinks to the bottom. does the water level rise slightly, lower slightly, or stay the same?

Answer 1

The water level goes down. The reason is that the mass of the brick while its in the boat displaces more water, compared to the volume of the brick when it is submerged in the water. This might seem counterintuitive at first, but some quick physics can show us why it's true.

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