Mathematical and Physical Journal
for High Schools
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Problem P. 4210. (December 2009)

P. 4210. 1 kg water of temperature 80 oC is poured onto 10 kg ice of temperature -30 oC which is in a thermally isolated container, and then 5 kg water vapour at a temperature of 120 oC is added.

What is the final state of the system?

(4 pont)

Deadline expired on January 11, 2010.

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

Megoldás. $\displaystyle 100 ^\circ$C-os víz (14,7 kg) és $\displaystyle 100 ^\circ$C-os gőz (1,3 kg).

Statistics:

 151 students sent a solution. 4 points: 120 students. 3 points: 14 students. 2 points: 2 students. 1 point: 7 students. 0 point: 3 students. Unfair, not evaluated: 5 solutions.

Problems in Physics of KöMaL, December 2009