quiz_01_solution - EML 5104 Classical Thermodynamics,...

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Unformatted text preview: EML 5104 Classical Thermodynamics, Spring 2010 Quiz 1, 8 Jan 2010 Name: ___________________________________ Please sign the honor pledge: "On my honor, I have neither given nor received unauthorized aid in doing this assignment." _________________________________ Signature Q1: A thermodynamic System is (1P) a) A collection of matter b) A region in space c) Can be both Q2: A closed System does not (1P) a) Exchange heat with the surroundings, b) Exchange work with the surroundings, c) Exchange matter with the surroundings, d) Exchange matter and energy with the surroundings. Q3: In your own words: a) what is an adiabatic, b) what is a diathermal boundary (2P) a) insulated; Q = 0 b) no temperature gradient, no resistance to heat transfer, ∇T ⋅ n = 0 Q4: A system boundary has(1P) a) zero surface area b) zero volume c) both d) neither Q5: The dynamic state of a mechanical system, consisting of N mass points, is given by the position and the velocity of each of the mass points. In 3D space the state therefore corresponds to (1P) a) k exp( ­E/RT) b) N R T c) 6 N 4 d) σ N e) k ln(N) scalar variables. Q6: Give the name and metric unit of the quantities below. Mark all thermodynamic properties (state variables, state properties) (4P, 1/2P per line, line must be completely correct) Symbol Name Unit TD property T Temperature Yes K (or °C) 2) p Pressure Pa (or N/m Yes V Volume m3 Yes U Internal Energy J (or Nm) Yes EML 5104 Classical Thermodynamics, Spring 2010 Q S W Heat flow, Rate of heat transfer Entropy Power, rate of work W (or J/s, or Nm/s) No J/K W (or J/s, or Nm/s) Yes No H Enthalpy J (or Nm) Yes G Gibbs free energy J yes Q9: Explain the difference between intensive and extensive thermodynamic properties (state variables, state properties) (2P) Intensive: independent of size of the system (remember i ­i) Extensive: dependent on size of system Q10: What is a) a process (transformation), b) a cycle (2P) a) a change of state b) a process that returns to its initial state Q11: Give the equation of state for an ideal gas. Explain each variable and give its metric units (3P). pV = nRT p: pressure (Pa) V: volume (m3) R: ideal gas constant (8.314 J/mol/K) T: temperature (K) Q12: Make a sketch of the thermodynamic system earth. Draw appropriate boundaries. Denote relevant heat, work, and mass transfer interactions (3P). Points: _______/ 20 P ...
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