# Physics Concepts

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1. Thermal Energy and Thermodynamics: 38
Thermal energy represents the total internal energy of an onject, the sum of its molecular kinetic and potential energies.
2. 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.
3. Thermal Energy and Thermodynamics: 40
First Law of Thermodynamics: ∆U = W + Q Where W is the work done ON the system
4. Thermal Energy and Thermodynamics: 41
• Thermodynamics Processes:
• Adiabatic process: Q = 0
• Isovolumetric (isochoric) process: W = 0
• Isothermal process: ∆U = 0
• Isobaric process: ∆U = W + Q
5. 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.
6. Thermal Energy and Thermodynamics: 43
Carnot cycles involve only isothermal and adiabatic processes. To determine the efficiency use the Kelvin temp. of the resevoirs.
7. 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)

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 Author: april1234 ID: 95296 Filename: Physics Concepts Updated: 2011-07-26 18:53:26 Tags: Thermal Energy Thermodynamics Folders: Description: Some Physics Concepts Show Answers:

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