Yesterday’s Problem:
When I was a kid I loved to wave a flexible corrugated tube around and around in a circle. It always make the coolest sound. Can you explain why this happens?
When I was a kid, I did not care a bit the answer to this question. But the challenge of the moment is to flex those neural networks. Go for it. Why does this happen?
Answer:
Air pressure at the moving end of the tube is lower than the pressure at the end being held. This pressure difference causes the air to flow through the tube. The air vibrates as it passes over the corrugated walls of the tube.
Which end of the tube do you prefer to hang out – the end being held or the end whirling about in the air?
Today’s Problem:
Place a coin in the bottom of a bucket so that when you peer over the rim of the bucket the coin is just out of sight. Without moving the bucket or your vantage point, slowly begin to fill the bucket with water. What do you see happening to the coin?