# Physics Concepts

 The flashcards below were created by user april1234 on FreezingBlue Flashcards. Thermal Energy and Thermodynamics: 38 Thermal energy represents the total internal energy of an onject, the sum of its molecular kinetic and potential energies. Thermal Energy and Thermodynamics: 39 Kinetic theory relates the average kinetic energy of the molecules in a gas to the temperature of the gas in Kelvins. Thermal Energy and Thermodynamics: 40 First Law of Thermodynamics: ∆U = W + Q Where W is the work done ON the system Thermal Energy and Thermodynamics: 41 Thermodynamics Processes:Adiabatic process: Q = 0Isovolumetric (isochoric) process: W = 0Isothermal process: ∆U = 0Isobaric process: ∆U = W + Q Thermal Energy and Thermodynamics: 42 On a PV diagram, if cycle is clockwise the system is a heat engine and the net work is nagative. If the cycle is counter clockwise the system is a refrigerator and the net work is positive. Thermal Energy and Thermodynamics: 43 Carnot cycles involve only isothermal and adiabatic processes. To determine the efficiency use the Kelvin temp. of the resevoirs. Thermal Energy and Thermodynamics: 44 Second Law of Thermodynamcis: Heat flows naturally from an object at a higher temperature to one of a lower temperature.All natural systems rend toward a state of higher disorder (entropy) Authorapril1234 ID95296 Card SetPhysics Concepts DescriptionSome Physics Concepts Updated2011-07-26T18:53:26Z Show Answers