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Unformatted text preview: because: • Moving atoms jostle adjacent atoms (in gases, liquids, and non-metallic solids), transferring some of their kinetic energy to them. • Nearly free, moving electrons travel many atomic lengths before jostling other electrons (in metals), transferring some of their kinetic energy to them. Physics 213 August 31, 2006 3.5 Physics 213 August 31, 2006 3.6 B. A 1 cm thick sheet of aluminum ( k = 200 W/m·K) is in contact with a 1 cm thick sheet of steel ( k = 50 W/m·K). The outside surface of the aluminum has a temperature of 10˚C and the outside surface of the steel has a temperature of 20˚C. What is the temperature where the sheets are in contact? 1. 12˚C 2. 15˚C 3. 18˚C 20˚C Al steel 10˚C Physics 213 August 31, 2006 3.7 $ Radiation Heat is transferred by electromagnetic radiation (infrared light, visible light, etc .) Heat current is H = Ae ! T 4...
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