I’m glad you asked! Have you ever seen what happens to water if you half fill a spherical flask and then suck the remaining air out?
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but what if instead of a drizzle it pours
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as long as it’s also on a frictionless surface
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Dump a few stones in. The problem never stated the cup had to be full with only water, did it?
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When ice cubes floating in water melt, the level of the water will not change (except by evaporation, but let’s ignore that for now).
Of course, if water was a normal substance, then ice cubes would be smaller, and would sink straight to the bottom of the cup.
… and in simple harmonic motion.
Boil boil, toil and trouble…
“Would you PLEASE take out the garbage? It’s half-full already.”
“Some people choose to view the can as half full. I prefer to view it as, half empty.”
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For everyone panicking about burning the world’s tiniest amount of plastic, a paper cup would also surely work fine for this. The trick of it not burning down past the water line should still work.
Punch hole in bottom of cup, then lower into basin of water until full.
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