Mathematical and Physical Journal
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Problem P. 4191. (October 2009)

P. 4191. A sample of Helium gas is cooled down at a pressure of 105 Pa. The gas gives off 5 kJ heat. By how many litres did the volume of the gas decrease?

(4 pont)

Deadline expired on November 10, 2009.


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

Megoldás. \(\displaystyle \Delta V=\frac{2Q}{5p_{0}}=0{,}02\,{\rm m^3}=20\,\)liter.


Statistics:

155 students sent a solution.
4 points:105 students.
3 points:20 students.
2 points:6 students.
1 point:3 students.
0 point:10 students.
Unfair, not evaluated:11 solutions.

Problems in Physics of KöMaL, October 2009