C10_presentation

C10_presentation - Thermal Energy U W Q HEAT Internal...

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Thermal Energy
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Internal Energy Internal Energy: Includes thermal energy; chemical energy; nuclear energy WORK HEAT Thermal Energy: that part of the internal energy which changes when the temperature changes (note: typically, we measure temperature in Kelvin) Q W U + =
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_____ A hot cup of tea on a table becomes cooler with time. _____ A meteorite entering the atmosphere glows white-hot. _____ Liquid nitrogen poured on a slab of ice boils furiously. (Liquid nitrogen boils at 77 K.) _____ A drill bit gets hot as it drills a hole in a metal slab. (C10T.5) Is the change in the following objects’ thermal energies due to the flow of heat (H) or work (W)? H W H W
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In a certain process, 40 joules of work energy flow into a system and 110 joules of heat energy flow out of the system. What is the net change in the system’s internal energy? J -70 J) (-110 J 40 = + + = U Q W U + =
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(C10T.1) A railroad car collides with a similar car at rest. The cars lock together. Does this process convert a significant amount of energy to thermal energy (compared to the first car’s kinetic energy)?
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C10_presentation - Thermal Energy U W Q HEAT Internal...

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