Physics

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Author:
andreabyerly
ID:
52458
Filename:
Physics
Updated:
2010-11-30 21:16:53
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Physics
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Description:
Physics Chapters 11 & 12
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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
    • 3) Radiation
  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
  22. Define Radiation:
    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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