January 29 AP Physics Gateway High School Olycasts

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Transcript of January 29 AP Physics Gateway High School Olycasts

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January 29 AP Physics Gateway High School Olycasts Slide 2 Slide 3 IN A gas follows the cycles shown. How much work is done? Slide 4 Objective: To find out how the conservation of energy applies to thermodynamics Slide 5 Homework check Slide 6 Conservation of Energy PE + KE + U = 0 Slide 7 James Prescott Joule Slide 8 Slide 9 Work in thermodynamic processes W=Fd W=PAd W= - PV Slide 10 PV diagram Slide 11 First law of Thermodynamics U = Q + W Slide 12 Isovolumetric (volume constant) U = Q Slide 13 Isothermal (temperature constant) U = 0 Therefore Q = W Slide 14 Isobaric (pressure constant) U = Q + W Slide 15 Adiabatic (thermally isolated system) U = W Slide 16 Processconditions first law Isobaricboth temp U=Q+W and volume change Isovolumetricno workV=0 so W=0 so U=Q Isothermalno change U=Q+W=0 in T or U so Q= - W Adiabaticno energyQ=0 transfer asso U=W heat Slide 17 PV diagrams and thermodynamic processes (quick quiz 12.2) Identify the paths Slide 18 Problems White board these problems together: 50, 51, 54 Slide 19 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