Quote:
Originally Posted by xelasnave
I find it hard to imagine where say the electron in a hydrogen atom gets its energy to keep wizzing around and around  ... look at it this way... some 13.5 billion years ago H can into existence... how does such a little thing manage to keep running all these years  ... must have a great power pack.
I know atomic science probably has an answer but forgeting that  ... dont you think it is strange that atoms can keep running presumably with only the power/ energy they started with...
alex   
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Alex,
Consider a car moving with constant velocity on a freeway. The car needs a continual feed of energy to overcome air resistance and other mechanical friction. Energy is continually lost from the system as heat.
Now, consider the motion of the planets around the Sun. They will orbit for perhaps billions of years as there is negligible resistance to motion. The total energy of the system dissipates very slowly. The system is not completely stable as the Sun will lose mass as it releases energy and the gravitational drag of the planets on each other will change their orbital properties. Eventually, the Sun will become a red giant and eat up the inner planets.
Now, consider an electron in orbit about a nucleus. This may be over-simplistic as I'm not a nuclear physicist, but the energy of the system is maintained. There is no resistance at the atomic level, the nucleus does not lose mass and neither does the electron. It remains in a stable, energy-preserving orbit.
Regards, Rob