You are sitting in a rowing boat in a small pond, you have an unopened can of baked beans with you. If you throw the can (which sinks) into the pond what happens to the level of the water in the pond
This question was plagiarized from Prof Peter Goodhew, thanks Mark
SOLUTION: The water level goes down! In the boat the mass of the can displaces its own mass of water (which is a lot of water as the beans are dense) when the can of beans sinks to the bottom of the pond they only displace their own volume which is small ( as they are dense) hence the water level goes down! Don't worry a beautiful illustration of the solution is coming soon.