4. Which thermodynamic property is the best measure of the molecular activity of a substance? a. Enthalpy b. Internal energy c. Entropy d. External energy 5. A substance whose properties are uniform throughout a sample is referred to as a. A solid b. An ideal substance c. A pure substance d. A standard substance 6. Which of the following statements is true for an isentropic steady-flow process? a. b. Work = -V(P2 – P1) C. P1 V2 d. P- P2

4. Which thermodynamic property is the best measure of the molecular activity of a substance? a. Enthalpy b. Internal energy c. Entropy d. External energy 5. A substance whose properties are uniform throughout a sample is referred to as a. A solid b. An ideal substance c. A pure substance d. A standard substance 6. Which of the following statements is true for an isentropic steady-flow process? a. b. Work = -V(P2 – P1) C. P1 V2 d. P- P2

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Initially contains Air: P1 = 30 lbf/in^2 T1 = 540 °F V1 = 4 ft^3 Second phase of process involving Air to a final state: P2 = 20 lbf/in^2 V2 = 4.5 ft^3 Wheel transfers energy TO the air by WORK at 1 Btu. Energy transfers TO the air by HEAT at 12 Btu. Ideal Gas Behavior. Wpw =-1 Btu Ima Determine whether the piston's work is done ON the system or BY the system. Q = -12 Btu Air Wpist = ? Initially, p₁ = 30 lbf/in.², T₁ = 540°F, V₁ = 4 ft³. Finally, p2 = 20 lbf/in.², V₂ = 4.5 ft³.
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