Classical Mechanics

# Are you sure that's what happens?

In the video above, the smallest domino knocks over a bigger domino that is taller, and heavier than itself. Subsequent dominos do the same so that, eventually, the chain knocks down a domino that's much, much bigger than the first one.

How is this possible?

Are any of the penguins in the huddle above losing more heat more quickly than they would if they were standing alone?

Suppose a running, closed refrigerator sits in a room of temperature $T.$ What would happen to the temperature of the room, after a long time, if the refrigerator door is left open?

You have a flat-bottomed paper cup filled with water and you heat it from below with the flame from a bunsen burner. Does the cup catch fire?

Assumptions

• We are thinking about the period in which the cup still contains water.
• The walls of the paper cup are very thin.

In the picture above, water flows from the bottle into the cup in a plane that's flying upside down. What explains this phenomenon?

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