Problem 2. A gas expands from a state where pi final pressure of 40 lbf/in?. The relationship between the pressure and volume during this process is pV'3 = constant. a) Calculate the final volume V2, in ft. 120 lbf/in? and V1 = 1.75 ft to a PVF = P;V$ P1 PV = const. GAS P2 2 PV = C = const. b) Determine the work done during this process, in ft-lbf. Convert your answer to BTU. c) If 8.3 BTU of heat leaves the system during this process, determine the change in internal energy, in BTU. Neglect potential and kinetic energy effects.
Problem 2. A gas expands from a state where pi final pressure of 40 lbf/in?. The relationship between the pressure and volume during this process is pV'3 = constant. a) Calculate the final volume V2, in ft. 120 lbf/in? and V1 = 1.75 ft to a PVF = P;V$ P1 PV = const. GAS P2 2 PV = C = const. b) Determine the work done during this process, in ft-lbf. Convert your answer to BTU. c) If 8.3 BTU of heat leaves the system during this process, determine the change in internal energy, in BTU. Neglect potential and kinetic energy effects.
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Transcribed Image Text:Problem 2. A gas expands from a state
where pi
final pressure of 40 lbf/in?. The relationship
between the pressure and volume during this
process is pV!3 = constant.
120 lbf/in? and Vi = 1.75 ft to a
P,VF = P,V
P
PV = const.
GAS
a) Calculate the final volume V2, in ft.
P2
2
PV = C = const.
b) Determine the work done during this
process, in ft-lbf. Convert your
answer to BTU.
V2
c) If 8.3 BTU of heat leaves the system during this process, determine the change in
internal energy, in BTU. Neglect potential and kinetic
energy effects.
Expert Solution
Step 1 Introduction
In thermodynamics, when a system works on the environment it is taken as positive, while if the environment works on the system it is negative. When heat is added to the system it is taken as positive, while if heat is taken out of it then it is taken as negative.
Polytropic process is a general process that takes place in an ideal process. It has a factor that encompasses various types of processes and by replacing the factor you can interchange between different processes.
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