5. Richard Feynman popularised a particular teaser in one of his books. He wanted to know what would happen to the direction of a particular object after it had been fully submerged in water. What was this particular object?
From Quiz What Would Feynman Say?
Answer:
Sprinkler
Well, this little conundrum has yet to be solved conclusively, though when it does get "solved" many will not agree - so, in reality, it is unlikely that an answer will ever be discovered! Many different suggestions have been given by many academics and professors, as well as amateur physicists. The basis of the problem is, when a reverse sprinkler is placed into water, what direction will the sprinkler move? The three possible options are, firstly, that the sprinkler would spin forward. Secondly, that the sprinkler would spin backward, or, finally, that the sprinkler would not spin at all. What do you think?