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For those who may remember, I posed a similar question on Tap-L back in
February, 2004. It was the string and ping pong ball in a beaker of water
on a scale. If the string were cut and the ball then floated, would the
scale reading change?
These are great thinking questions that are very challenging for students
-- even my brightest ones. And when physics teachers argue back and forth,
you can only imagine what students think about these questions. I made
them bonus questions on tests. Few got them correct. Maybe better as a
demo or something.