January 29 AP Physics Gateway High School Olycasts.
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Transcript of January 29 AP Physics Gateway High School Olycasts.
January 29AP Physics
Gateway High School Olycasts
IN A gas follows the
cycles shown. How much work is done?
Objective:
To find out how the conservation of energy applies to thermodynamics
Homework check
Conservation of Energy
ΔPE + ΔKE + ΔU = 0
James Prescott Joule
Work in thermodynamic processes
W=FΔd
W=PAΔd
W= -PΔV
PV diagram
First law of Thermodynamics
ΔU = Q + W
Isovolumetric (volume constant)
ΔU = Q
Isothermal (temperature constant)
ΔU = 0
Therefore
Q = W
Isobaric (pressure constant)
ΔU = Q + W
Adiabatic (thermally isolated system)
ΔU = W
Process conditions first law
Isobaric both temp ΔU=Q+Wand volume change
Isovolumetric no work ΔV=0 so W=0so ΔU=Q
Isothermal no change ΔU=Q+W=0
in T or U so Q= - WAdiabatic no energy Q=0
transfer as so ΔU=Wheat
PV diagrams and thermodynamic processes (quick quiz 12.2)
Identify the paths
Problems
White board these problems together:
50, 51, 54
Out:
Which of these processes are isothermal, isovolumetric, or adiabatic:
a) A tire being rapidly inflated
b) A tire expanding gradually at a constant temperature
c) A steel tank of gas being heated