Monday, February 14, 2011

60-Second Good-To-Knows 2-14-11

This week’s topic: Physics

Laws of Thermodynamics:
1. First law of thermodynamics: The change in the internal energy of a system U plus the work done by the system W equals the net Heat Q added to the system: Q = ΔU + W
2. Second law of thermodynamics:
a. Heat flows spontaneously from a hotter object to a cooler one, but not in the opposite direction.
b. No machine can work with 100% efficiency: all machines generate heat, some of which is lost to the surroundings.
c. Any system tends spontaneously towards maximum entropy.

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