Four kg of air is contained in a piston-cylinder assembly at 400 kPa and 28 °C. The piston carries a static load, including its own mass, of 5000 lbf, but is otherwise unconnected to an external system. The air is heated until the piston is thrice as high as it was initially. If the atmospheric pressure is 101 kPa, and the process is 92 percent efficient, how much work, in Btu, is done by the air?

Four kg of air is contained in a piston-cylinder assembly at 400 kPa and 28 °C. The piston carries a static load, including its own mass, of 5000 lbf, but is otherwise unconnected to an external system. The air is heated until the piston is thrice as high as it was initially. If the atmospheric pressure is 101 kPa, and the process is 92 percent efficient, how much work, in Btu, is done by the air?

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

See similar textbooks

Similar questions

Please indicate the given. Determine the optimal intermediate pressures and work needed per kilogram of gas for a three-stage compressor that must compress air between 120 kN/m2 and 288 K to 3800 kN/m2. It's likely that the compression is adiabatic, and that interstage cooling is being used to cool the air back to its initial temperature.
Helium is used in the Carnot engine where the volumes beginning withconstant temperature heat addition are V 1 = 0.3565 m^3 ; V 2 = 0.5130 m^3 ; V 3 = 8.0m^3 ; V 4 = 5.57 m^3 . Determine the thermal efficiency. Use 1.66 as the specificratio of helium. show diagram
Is aircon-ditioner an example of thermodynamic system inside the house? Is it an open system, closed system or isolated system? Explain why.
A steel casting weighing 2 kg has an initial temperature of 500oC; 40 kg of water initiallyat 25oC is contained in a perfectly insulated steel tank weighing 5 kg. The casting isimmersed in the water and the system is allowed to come to equilibrium. What is its finaltemperature? Ignore effects of expansion or contraction, and assume constant specific heatsof 4.18 kJ/kg.oC for water and 0.5 kJ/kg.oC for steel.
A cylindrical tank 4 m long and 3 m diameter is used for oil storage. How many days can the tank supply the engine having 27°API with fuel consumption of 60 kg/hr?
Steam at 2.6MPa, 400°C expand isothermally until its pressure becomes 4.36MPa. Det dH, dU, dS, dV, Wnf, Wsf, and Q.
Box the final answer. Write legibly. Steam flows into a turbine at a rate of 3.5 kg/s and ¾ MW of heat are lost from the turbine. Ignoring elevation and kinetic energy effects, calculate the power output from the turbine in KW? Steam pressure entering the turbine is 62 Bar at 440ºC and leaves at 74 Kpa.
A closed rigid container has a volume of 1 m3 and holds air at 344.8 kPa and 273 K. Heat is added until the temperature is 600 K. (Rair = 0.287 kJ/kg K), (kair = 1.4). What is the change in enthalpy? What is the value of heat added to the system?
Air is compressed into a 90 ft3 rigid tank until the pressure is 30.5 psia and the temperature becomes 580 0R. What is the mass of the air in lbm and the change in pressure when the temperature decreases to 300 0R Rair = 53.342 ft-lbf/ lbm-0R (c) What is the final pressure of the gas? (The value of gas constant, R = 0.4615 kJ/kg-K, Cp = 1.8723 kJ/kg-K, Cv = 1.4108 kJ/kg-K)
If 9 m^3 of an ideal gas at 24 degC and 148 kPaa is compressed to 4 m^3. What would have been the pressure, in kPa, if the process is isentropic. (Use k = 1.3)
27.) Determine the specific volume of compressed liquid at P= 5000 psia and T= 350C ? 25.) A 250 lbm astronaut landed on the moon where the local gravity is g = 5.48 ??/?2. How much will he weigh in lbf?
Draw Pv and Ts diagram of reversible isobaric process. Write the relationship between thermodynamic properties.