Mathematical and Physical Journal
for High Schools
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Problem P. 4618. (March 2014)

P. 4618. In three different containers there are three samples of air at three different temperature values of 300 K, 500 K and 720 K. Allowing heat transfer between the 300 K and the 500 K samples of gas, the common temperature would be 420 K, and allowing heat transfer between the 300 K and the 720 K samples of gas the common temperature would be 600 K. What would be the common temperature of the samples of air of initial temperatures of 500 K and 720 K? What is the ratio of the initial internal energy values of the three samples of gas?

(4 pont)

Deadline expired on April 10, 2014.

Sorry, the solution is available only in Hungarian. Google translation

Megoldásvázlat. A harmadik esetben a közös hőmérséklet 637,5 K\(\displaystyle \approx\)640 K. Kezdetben az energiák aránya: \(\displaystyle 2:5:12\).


86 students sent a solution.
4 points:71 students.
3 points:5 students.
2 points:2 students.
1 point:4 students.
0 point:4 students.

Problems in Physics of KöMaL, March 2014