P110_2008_Week_4

P110_2008_Week_4 - Generalized Energy conservation (H&amp;K...

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Generalized Energy conservation Energy OUT Energy IN Energy Stored

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You can heat up a beaker of water (or anything else) by either doing work (friction converts work to thermal energy) or by “heat transfer”
Phase transitions in water

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Specific Heats Ice (near 0 o C) 2090 J/kg.K=2090 J/kg.C o Water (near 0 o C) 4186 J/kg.K=1.00 cal/kg.C o Aluminum 900 J/kg.K Copper 387 J/kg.K Temperature Scales: 0 o C = 273.15 K ice melts at this temp 100 o C = 373.15 K water boils at this temp O K is absolute zero, the coldest temperature possible. Note that 1C o = 1 K (1 Celsius degree temp difference is 1 K difference as well). The Celsius degree and the Kelvin are the same size! The only difference in the scales is the position of the origin, hence the two scales are equivalent for talking about temperature DIFFERENCES, but not for talking about actual temperature readings.
Thermal Conduction Power=(Q/ t) = k A(T H – T C )/L k : thermal conductivity (depends on the material, not on the geometry). Units? http://sol.sci.uop.edu/~jfalward/heattransfer/heattransfer.html

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Diamond >1000 W/m.K Aluminum ~225 W/m.K Stainless steel 14 W/m.K
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P110_2008_Week_4 - Generalized Energy conservation (H&amp;K...

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