Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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Problem P. 3923. (November 2006)

P. 3923. In a thermally insulated container there was some water at a temperature of 30\,{}^\circ\rm
C, then 1 kg ice at temperature -30\,{}^\circ\rm C was added. How much water was initially in the container if

a) there was no phase change;

b) the total amount of ice melted;

c) the total amount of water froze?

(4 pont)

Deadline expired on December 11, 2006.


Statistics:

285 students sent a solution.
4 points:224 students.
3 points:12 students.
2 points:11 students.
1 point:13 students.
0 point:10 students.
Unfair, not evaluated:15 solutions.

Problems in Physics of KöMaL, November 2006