
(a)
The work done by engine during the 4 steps and the net work done.
(a)

Answer to Problem 86P
The work done by engine during the 4 steps are
Explanation of Solution
Write the expression for work done during process A.
Here, T is the temperature,
B and D are isochoric processes. Therefore, work done is zero.
Write the expression for work done during process C.
Here, T is the temperature,
Conclusion:
For the process A,
Substitute 373 K for T,
For the process C,
Substitute 273 K for T,
The net work done is,
Therefore, work done by engine during the 4 steps are
(b)
The efficiency of the engine.
(b)

Answer to Problem 86P
The efficiency of the engine is
Explanation of Solution
Write the expression for efficiency of the engine.
Here, e is the efficiency and
Write the expression for input heat.
Here,
Therefore, the input heat is,
Conclusion:
Substitute
Therefore, efficiency of the engine is
(c)
The ratio of efficiency of reversible engine and the given engine.
(c)

Answer to Problem 86P
The ratio of efficiency of reversible engine and the given engine is
Explanation of Solution
Write the expression for the efficiency of reversible engine.
Here,
Conclusion:
Substitute 273 K for
The ratio is given by,
The ratio of efficiency of reversible engine and the given engine is
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Chapter 15 Solutions
Physics
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