Mathematical and Physical Journal
for High Schools
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Problem P. 3998. (September 2007)

P. 3998. A cylinder with a piston in it encloses some air. Initially the volume of the air is V=0.1 m3, its temperature is 27 oC, and its pressure is p=113 kPa. The system is operated as a heat engine, while the air is taken through a cyclic process which consists of two isobaric processes at pressures of p and 2p and two isochoric processes at volumes of V and 3V.

a) What is the work done by the gas in the cyclic process?

b) What is the efficiency of this heat engine?

(4 pont)

Deadline expired on October 11, 2007.


107 students sent a solution.
4 points:54 students.
3 points:32 students.
2 points:4 students.
1 point:9 students.
0 point:3 students.
Unfair, not evaluated:5 solutions.

Problems in Physics of KöMaL, September 2007