
(a)
The PV diagram for each process in the cycle.
(a)

Answer to Problem 72P
The required PV diagram is shown in Figure 1.
Explanation of Solution
Given data:
The amount
The temperature
The pressure
The pressure
The temperature
The pressure
The temperature
The pressure
The temperature
The pressure
The temperature
Formula:
The expression to determine the initial volume of the gas is given by,
The volume of the gas after the adiabatic process is given by,
The expression for the temperature of the gas after adiabatic process is given by,
The volume of the gas after the isobaric process is given by,
The expression to determine the temperature of the gas after the isometric expansion is given by,
The expression for the volume of the gas after the isobaric process is given by,
Calculation:
The initial volume of the gas is calculated as,
The volume of the gas after the adiabatic process is calculated as,
The temperature of the gas after adiabatic process is calculated as,
Solve further as,
The volume of the gas after the isobaric process is calculated as,
The expression to determine the temperature of the gas after the isometric expansion is given by,
The expression for the volume of the gas after the isobaric process is given by,
From the above calculations the PV diagram for the different process is shown below.
The required diagram is shown in Figure 1
Figure 1
Conclusion:
Therefore, the required PV diagram is shown in Figure 1.
(b)
The work done by the gas during the complete cycle.
(b)

Answer to Problem 72P
The work done in the complete cycle is
Explanation of Solution
Formula Used:
The expression to determine the work done by the gas from
The expression to determine the work done by the gas from
The expression to determine the work done by the gas from
The expression for the total work during the complete cycle is given by,
Calculation:
The total work during the complete cycle is calculated as,
Solve further as,
Conclusion:
Therefore, the work done in the complete cycle is
(c)
The heat absorbed by the gas during the complete cycle.
(c)

Answer to Problem 72P
The heat absorbed by the gas is
Explanation of Solution
Formula:
The expression for the first law of
Calculation:
The heat absorbed by the gas is calculated as,
Conclusion:
Therefore, the heat absorbed by the gas is
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Chapter 18 Solutions
Physics for Scientists and Engineers, Vol. 1
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