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Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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
Transcribed Image Text:A piston-cylinder contains nitrogen initially at 100 kPa, 20°C, and a volume of
0.283 m³ (State 1). The nitrogen undergoes two processes. First, the nitrogen
is compressed to 7000 kPa (State 2) in an isothermal process. Finally, the
nitrogen is expanded to 100 kPa (State 3) in a reversible adiabatic process. You
may assume that nitrogen is an ideal gas with constant (average) specific heats:
Cp = 1.039 kJ/kgK, c, = 0.742 kJ/kgK, and R= 0.297 kJ/kgK.

Transcribed Image Text:3. What is the work and heat transfer for each process in kJ?
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- Steam at 1 MPa, 250 °C is contained in a rigid vessel. It is now cooled to 25 ° C. The final quality (If applicable) of the vessel contents is:arrow_forwardOn the P-v diagram, sketch the constant-temperature process through the state P = 280 kPa, v = 0.06 m3 /kg as pressure changes from P1 = 400 kPa to P2 = 200 kPa. Place the value of the temperature on the process curve on the P-v diagram.arrow_forward8. Nitrogen at an initial state of 300K, 150 kPaa, and 0.2m3 is compressed slowly in an isothermal process to a final pressure of 800 kPa. Determine the work done during this process (kJ). Draw a figure or graph that will support the problem. Explain each step by step formula. avoud shortcutarrow_forward
- Problem 5 - Change in entropy for a pure substance A frictionless piston-cylinder assembly contains 0.005 m³ water at 150 kPa and 225°C. Next, the water is cooled at constant pressure until its quality becomes equal to 0.70. Please answer the following. a. Represent the process for the water on a T-s diagram. In your T-s diagram include values for P, T and s. b. Determine the entropy change of the water during this process, in kJ/K using three significant figures. c. Determine the amount of heat removed from the water, in kJ.arrow_forwardPlease answer all and correctly, Asaparrow_forwardDraw the P-V diagram of the following mechanically reversible process of an ideal gas in a closed system and calculate the total work done. Indicate whether this work is done by the system or on the system. a. State A (2V, P) to State B (V, P) b. State B (V, P) to State C (V, 2P) c. State C (V, 2P) to State D (3V, 2P) d. State D to State A. What is the total internal energy change, enthalpy change and net heat flow (added or extracted) for the process?arrow_forward
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