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Balls of confusion (Posted on 2005-04-05) Difficulty: 3 of 5
In a room there are two completely identical metal balls. One is lying on a table and the other is hanging on a cable attached to the ceiling. At the same moment, 1 Joule of heat energy is applied to each of them. Immediately after that, the balls are perfectly insulated, such that absolutely no heat transfer is possible.
Which one is the coldest?

See The Solution Submitted by Hugo    
Rating: 4.3333 (3 votes)

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re(3): Just a question + To Ajosin | Comment 10 of 11 |
(In reply to re(2): Just a question + To Ajosin by ajosin)

And if anyone is wondering, no, you cannot cool yourself down by climing up some stairs!.

The reason is that the energy you use to climb the stairs is stored as quemical energy. The body is not 100% efficient either, so you use more quemical energy than you really need and you warm up. That is why you will start sweating if you climb a bunch of stairs.

On the other hand, the metal ball is extremely simple compared to the body. The ball can only draw energy from the kinetic energy of it's atoms, so it cools down when it expands up against the gravity field.

  Posted by ajosin on 2005-04-14 14:01:54

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