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what are effect of thermal expansion?
he molecules move further apart when heated or closer when cooled. Use of heat, stream engine. Uses of cooling, compressed gas. source: yahoo
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Asked 3/28/2012 1:14:19 PM
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when photon are rest its mass is zero how?
Weegy: Photon equations are different from the Newton-like ones: there is no force term to accelerate a photon, etc. Its energy is calculated differently: hv. So speaking of photon mass is senseless. [ What we need to know is how photons are created and how they exchange the energy-momentum with matter. The theory of that does not contain any mass belonging to photon. Moreover, the relativistic relationship between the photon energy and momentum is valid only for m=0. source: › Physics › Special & General Relativity ] (More)
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Asked 3/29/2012 8:42:32 AM
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What is operating system?
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Updated 5/26/2016 12:36:11 PM
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An operating system is the program that, after being initially loaded into the computer by a boot program, manages all the other programs in a computer.

Added 5/26/2016 12:36:11 PM
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