Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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- thermodynamicsarrow_forwardA fixed-mass system contains mass, m = 1.0 kg of air. A thermodynamic process occurs from state one to state two, where T₁ = 300 °K, P₁ = 100 kPa; T₂ = 2700 °K, P₂ = 204.9953251 kPa. Determine S₂ - S₁ = m (S₂-S₁) in kJ / °K. Note: You are required to assume constant specific heats in this problem, with Cpo = 1.004 kJ/(°K * kg); for air, the gas constant is R = 0.287 kJ/(°K * kg).arrow_forwardKrypton in a closed system is compressed adiabatically from 74 K and 1 bar to a final pressure of 24 bar. What is the final temperature in K? Assume krypton is an ideal gas. From Appendix B in the text, we can assume the heat capacity of krypton is independent of temperature and CP=2.5R , where R is the molar gas constant R=8.314 J/(mol K). For an ideal gas, recall CV=CP−R=1.5R. Report your answer in units of K using three decimal places.arrow_forward
- A closed system consists of gas of 2 kg initially in state 1 with p1 4bar and specific volume V1 = 1m /kg. The system undergoes a power cycle consisting of the following processes: Process 1-2: polytropic process to v2 = 2m3 /kg, p2 = 1bar; Process 2-3: isobaric compression to v1; Process 3-1: isochoric process to p1. Draw the cycle on a p – v (specific volume) diagram. Show the system states, cycle direction, and the cycle (net) work.arrow_forwardSteam in a piston-cylinder assembly undergoes a polytropic process, with n = 2, from an initial state where V₁ = 4.38600 ft³, p₁ = 400 lbf/in², and u₁ = 1322.4 Btu/lb to a final state where u₂ = 1036.0 Btu/lb and v₂ = 3.393 ft³/lb. The mass of the steam is 2.5 lb. Changes in kinetic and potential energy can be neglected. Determine the change in volume, in ft3, the energy transfer by work, in Btu, and the energy transfer by heat, in Btu.arrow_forwardA gas is contained in a vertical piston-cylinder assembly by a piston with a face area of 60 in2 and weight of 100 lbf. The atmosphere exerts a pressure of 14.7 lbf/in² on top of the piston. A paddle wheel transfers 3 Btu of energy to the gas during a process in which the elevation of the piston increases slowly by 2 ft. The piston and cylinder are poor thermal conductors, and friction between the piston and cylinder can be neglected. Determine the work done by the gas on the piston, in Btu, and the change in internal energy of the gas, in Btu. Step 1 Determine the expansion work done by the gas on the piston, in Btu. Wexp = i Btuarrow_forward
- A closed system contains 1.2 kg of fluid, initially at 1.3 bar with a specific volume of 0.8 m3/kg. It undergoes a simple cycle as follows: 1-2 Constant volume heat addition of 26 kJ to 2.9 bar 2-3 Adiabatic expansion back to original pressure (k=1.4) • 3-1 Constant pressure process back to original conditions. Find for each process: • Work done Heat transfer Change of internal energyarrow_forwardFive lbs of propane is contained in a closed, rigid tank initially at 80 lbf/in.2, 50°F. Heat transfer occurs until the final temperature in the tank is 0°F. Kinetic and potential energy effects are negligible. Determine the amount of energy transfer by heat, in Btu. Q= i Btuarrow_forwardAir is compressed in a piston–cylinder assembly from p1 = 25 lbf/in2, T1 = 500°R, V1 = 9 ft3 to a final volume of V2 = 1 ft3 in a process described by pv1.30=constant. Assume ideal gas behavior and neglect kinetic and potential energy effects. Using constant specific heats evaluated at T1, determine the work and the heat transfer, in Btu.arrow_forward
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