Air undergoes a polytropic process in a piston-cylinder assembly from p₁ = 1 bar, T₁ = 295 K to p2 = 9 bar. The air is modeled as anideal gas and kinetic and potential energy effects are negligible.For a polytropic exponent of 1.4, determine the work and heat transfer, each in kJ per kg of air,(1) assuming constant cy evaluated at 300 K.(2) assuming variable specific heats.

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Answered: Air undergoes a polytropic process in a…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A closed system consisting of 10 lb of air undergoes a polytropic process from p₁ = 65 lbf/in², v₁ = 4 ft³/lb to a final state where p₂ = 20 lbf/in², v₂ = 11 ft³/lb. Determine the polytropic exponent, n, and the amount of energy transfer by work, in Btu, for the process. Step 1 Your answer is correct. Determine the polytropic exponent, n, for the process. n = 1.16 Hint Step 2 Your answer is incorrect. Determine the amount of energy transfer by work, in Btu, for the process. W = i 462.623 Btu Toutbo dlo Attempts: 1 of 4 used
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In terms of air drop cargos, the containers vertical speed will keep decreasing until, if it remains in the air long enough, it reaches thermal velocity. Select one: True False
Refrigerant 134a expands in a piston-cylinder assembly from p₁ = 140 lb/in² and T₁ = 140°F to p₂ = 30 lb/in² and T₂ = 80°F. The mass of refrigerant is 0.44 lb. During the process, the work done by the refrigerant is 4.32 Btu. Kinetic and potential energy effects are negligible. Determine the initial volume of the refrigerant, V₁, in ft³, and the heat transfer for the process, in Btu.
In a constant-volume process, 202 J of energy is transferred by heat to 0.90 mol of an ideal monatomic gas initially at 297 K. (a) Find the work done on the gas. (b) Find the increase in internal energy of the gas. (c) Find its final temperature.
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The steel cables supporting the "Lion's Gate" suspension bridge are approximately 1200 metres long. If the temperature ranges from -9 to 26 C between winter and summer extremes, calculate the variation in the length of thg cables. Linear coefficient (steel) : (12)(10-6)/OC.
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A piston-cylinder assembly contains 3.5 kg of air, initially at 2.0 bar, 30 °C. The air undergoes a process to a state where the pressure is 3.0 bar, during which the pressure-volume relationship is pV = constant. Assume ideal gas behavior for the air. Determine the work and heat transfer, in kJ.

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