Galileo pointed out that, ignoring air resistance, all bodies fall with the same acceleration. But what about objects sinking in water of different temperatures? Here is the puzzle: Suppose you drop a brick in each of two identical tanks. One of the tanks has water at 40 degrees F and the other has it at 30 degrees F. Which brick would sink faster?
If you have not tried to solve it, have a go now. For everyone else, the answer is after the break.
Well, the water at 30 degrees F would be frozen, so the brick would sink much faster in the other tank! Did you solve it?
I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.