A 300-lb iron casting, initially at 600°F, is quenched in a tank filled with 2121 lb of oil, initially at 80°F. The iron casting and oil can bemodeled as incompressible with specific heats 0.10 Btu/lb · °R, and 0.45 Btu/lb · °R, respectively.(a) For the iron casting and oil as the system,determine the final equilibrium temperature, in °F.Ignore heat transfer between the system and its surroundings.Tf= i°F(b) For the iron casting and oil as the system,determine the amount of entropy produced within the tank, in Btu/°R.Ignore heat transfer between the system and its surroundings.O =iBtu/°R

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Answered: A 300-lb iron casting, initially at…

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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for steam, the specific ideal gas constant = 461.5 J/kg K A closed system is comprised of pure water substance initially at a temperature of 500 oC and a pressure of 20 MPa (state 1). The system undergoes an isochoric process whereby its pressure drops to 0.1 Mpa (state 2). Sketch the process on a Temperature-specific entropy plot, showing the lines of constant pressure which pass through steps 1 and 2.
Oxygen gas initially at 355 K and 1.50 bar undergoes the following cyclic processes in a closed system:Step 1: Adiabatic compression to 7.50 barStep 2: Addition of 13 240.0 J/mol of heat to raise the temperature at constant pressureStep 3: Adiabatic expansion to 1.50 barStep 4: Isobaric cooling back to original state.Determine ΔU, ΔH, Q and W for each step, and for the overall reversible process. Express all answers in kJ/mol and up to decimal places
during reversible process, 2.09 kg/s of gas rejects 322.9 kJ/s of heat isothermally at 25.5 degrees C. (for this gas, cp= 2.14 kJ/kg-K and cv= 1.62 kJ/kg-K). The initial pressure is 551.7 kPa. determine the work steady flow of the process if change in PE= 2.8 kJ/s and change in KE= 6.2 kJ/s
An ideal gas contained in a piston-and-cylinder device undergoes a thermodynamic cycle made up of three quasi-equilibrium processes. Step 1-2: Adiabatic compression from 330 K and 9.35 atm to 12.58 atm Step 2-3: Isobaric cooling Step 3-1: Isothermal expansion c.) Calculate Q, W, ΔU and ΔH, in J/mole, for each step in the process and for the entire cycle. Assume that CP = (5/2) R. d.) Is this cycle a power cycle or a refrigeration cycle? Explain. Calculate the thermal efficiency or COP of the cycle, whichever is appropriate.
Nitrogen (N2) contained in a piston–cylinder arrangement, initially at 6.9 bar and 416 K, undergoes an expansion to a final temperature of 300 K, during which the pressure–volume relationship is pV1.2 = constant. Assuming the ideal gas model for the N2, determine the heat transfer in kJ/kg.
A quantity of a certain perfect gas is compressed from an initial state of 0.085 m3 , 1 bar to a final state of 0.034 m3 , 3.9 bar. The specific heat at constant volume is 0.724 kJ/kg K, and the specific heat at constant pressure is 1.020 kJ/kg K. The observed temperature is 146 K. Determine the specific gas constant, R, The mass of the gas present, and the increase of internal energy of the gas.
Refrigerant 134a at p1 = 30 lbf/in2, T1 = 40oF enters a compressor operating at steady state with a mass flow rate of 350 lb/h and exits as saturated vapor at p2 = 160 lbf/in2. Heat transfer occurs from the compressor to its surroundings, which are at T0 = 40oF. Changes in kinetic and potential energy can be ignored. The power input to the compressor is 3.5 hp. Determine the heat transfer rate for the compressor, in Btu/hr, and the entropy production rate for the compressor, in Btu/hr·oR.
Three-tenths kmol of carbon monoxide (CO) in a piston– cylinder assembly undergoes a process from p1 = 150 kPa, T1 = 300 K to p2 = 500 kPa, T2 = 420 K. For the process, W = -300 kJ.Employing the ideal gas model, determine:(a) the heat transfer, in kJ.(b) the change in entropy, in kJ/K.
piston–cylinder assembly contains air, initially at 2.6 bar, 134 K, and a volume of 2.6 m3. The air undergoes a process to a state where the pressure is 0.8 bar, during which the pressure–volume relationship is pV = constant. Assuming ideal gas behavior for the air, determine the work for the process in kJ.
for steam, the specific ideal gas constant = 461.5 J/kg K A closed system is comprised of pure water substance initially at a temperature of 500 oC and a pressure of 20 MPa (state 1). The system undergoes an isochoric process whereby its pressure drops to 0.1 Mpa (state 2). Evaluate the specific entropy, specific volume and temperature of the system at state 2.
One kilogram of air, initially at 5 bar, 350 K, and 3 kg of carbon dioxide (CO2), initially at 2 bar, 450 K, are confined to opposite sides of a rigid, well-insulated container. The partition is free to move and allows conduction from one gas to the other without energy storage in the partition itself. The air and carbon dioxide each behave as ideal gases. Determine the final equilibrium temperature, in K, and the final pressure, in bar, assuming constant specific heats.
Problem 3.091 SI Carbon dioxide (CO2) is compressed in a piston–cylinder assembly from p1 = 0.7 bar, T1 = 280 K to p2 = 8 bar. The initial volume is 0.2 m3. The process is described by pV1.25 = constant.Assuming ideal gas behavior and neglecting kinetic and potential energy effects, determine the work and heat transfer for the process, each in kJ, using constant specific heats evaluated at 300 K, and data from Table A-23.

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