# Physics

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 Author: andreabyerly ID: 52458 Filename: Physics Updated: 2010-11-30 21:16:53 Tags: Physics Folders: Description: Physics Chapters 11 & 12 Show Answers:

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1. Kilocalorie (kcal)
the amount of heat needed to raise the temp. of 1 kg of water by 1°C
2. 1 kcal = ___ J
4186
3. 1 cal = ___ J
4.186
4. Specific Heat:
the heat required to raise or lower the temp of 1 kg of a substance by 1°C
5. The amount of heat required to change the temp of a substance by a temp difference...
Q=mcΔT
6. Latent heat for a solid-liquid phase change
latent heat of fusion (Lf)
7. Latent heat for a liquid-gas phase change
Latent heat of vaporization (Lv)
8. Ice → Water
Qf > 0
9. Ice ← Water
Qf < 0
10. Water → Gas
Qv > 0
11. Water ← Gas
Qv < 0
12. What is "A"?
Solid C1
13. What is "B"?
Phase Change = Lf

Melting
14. What is "C"?
Liquid C2
15. What is "D"?
Phase Change = Lv

Boiling
16. What is "E"?
Gas C3
17. Where is the boiling point?
140°C
18. Where is the melting point?
110°C
19. Three mechanisms of heat transfer:
• 1) Conduction
• 2) Convection
20. Define Conduction:
heat transfer due to direct contact of objects that have different temps
21. Define Convection:
heat transfer due to mass movement of gas or liquid molecules
heat transfered by electromagnetic radiation between objects that have different temperatures
23. Thermal Conductor
good conductor of heat
24. Thermal Insulator
poor conductor of heat
25. The 1st law of thermodynamics
the 1st law is a statement of conservation of energy in terms of thermodynamic variables ΔU, Q &W

Q=ΔU+W
26. ΔU =
change in the systems internal energy
27. HEAT ENGINE: arrows go ___ and ___
down and out

Wnet
28. THERMAL PUMP: arrows go ___ and ___
up and in

Win
29. ε =
Wnet/Qh
30. The 2nd law of thermodynamics
Certain processes do not take place even though they may be consistent with the first law

- heat will not flow spontaneously from a cooler body to a warmer body

- in a thermal cycle, heat energy cannot be completely transformed into mechanical work.

- The work output is always less than the energy input.
31. The Carnot Cycle
ε = 1- (Tc/Th)

Temp must be in K
32. COPref =
Qc/Win

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