Last Problem:
Will the time it takes for a Ping-Pong ball to rise to the top of a cylinder of water be different if the water in the cylinder is still or if it is swirling around?
Answer:
The light weight Pong ball will rise very quickly in still water.
But, when the water is agitated, the buoyancy of the ball is drastically reduced. The movement of the liquid produces higher pressures that makes the displacement of the water by the ball more difficult.
Today’s Problem:
You have two glasses, one exactly half full of tea, the other exactly half full of milk. Take a teaspoon of milk from the glass and stir it into the tea. Then take a teaspoon of the tea-milk mixture and stir that into the glass with the milk.
Is there now more milk in the tea than there is tea in the milk? Or, is there more tea in the milk and milk in the tea? [This one is tricky, eh?]