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Published byDominic McCulloch Modified over 3 years ago

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January 29 AP Physics Gateway High School Olycasts

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IN A gas follows the cycles shown. How much work is done?

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Objective: To find out how the conservation of energy applies to thermodynamics

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Homework check

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Conservation of Energy ΔPE + ΔKE + ΔU = 0

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James Prescott Joule

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Work in thermodynamic processes W=FΔd W=PAΔd W= - PΔV

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PV diagram

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First law of Thermodynamics ΔU = Q + W

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Isovolumetric (volume constant) ΔU = Q

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Isothermal (temperature constant) ΔU = 0 Therefore Q = W

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Isobaric (pressure constant) ΔU = Q + W

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Adiabatic (thermally isolated system) ΔU = W

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Processconditions first law Isobaricboth temp ΔU=Q+W and volume change Isovolumetricno workΔV=0 so W=0 so ΔU=Q Isothermalno change ΔU=Q+W=0 in T or U so Q= - W Adiabaticno energyQ=0 transfer asso ΔU=W heat

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PV diagrams and thermodynamic processes (quick quiz 12.2) Identify the paths

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Problems White board these problems together: 50, 51, 54

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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

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B2 Thermodynamics Ideal gas Law Review PV=nRT P = pressure in Pa V = volume in m3 n = # of moles T= temperature in Kelvin R = 8.31 J K -1 mol -1 m = mass.

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