Problem Set 2 Solutions

# Problem Set 2 Solutions - MSE 308 Thermodynamics of...

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MSE 308 Dept. of Materials Science & Engineering Thermodynamics of Materials Spring 2005/Bill Knowlton Problem Set 2 Solutions 1. Prove that the inexact differential, dw is equal to mechanical work, pdV : i.e, pdV = when the change in all other work is constant. Use the fact that Fdx = where F is force and x is distance. i Fdx F dx A A PdV where F P A and Vx A = =⋅ = =

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MSE 308 Dept. of Materials Science & Engineering Thermodynamics of Materials Spring 2005/Bill Knowlton 2. Prove that mechanical work on a system is negative. Use a drawing of a cylinder and piston to prove this and the concept of state 1 with variable V 1 and P 1 and state 2 with variables V 2 and P 2 .
MSE 308 Dept. of Materials Science & Engineering Thermodynamics of Materials Spring 2005/Bill Knowlton 3. The equation I provided in class that describes the 1 st Law of Thermodynamics has an opposite sign as equation (2.2) provided by Gaskell on page 19. Explain why there is a difference.

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Problem Set 2 Solutions - MSE 308 Thermodynamics of...

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