P110_2008_Week_4

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

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Generalized Energy conservation Energy OUT Energy IN Energy Stored
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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”
Background image of page 2
Phase transitions in water
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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.
Background image of page 4
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
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Diamond >1000 W/m.K Aluminum ~225 W/m.K Stainless steel 14 W/m.K
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 25

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

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online