Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation

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Problem P. 3825. (October 2005)

P. 3825. By what amount does the area of a 20-Forint coin increase, if its diameter at 20 ^oC is 26.3 mm, and in our pocket its temperature increases to 35 ^oC. (The coefficient of linear expansion is $\alpha$ =1.84^.10^-5 ^oC^-1.)

(3 pont)

Deadline expired on November 11, 2005.

Statistics:

360 students sent a solution.

3 points: 259 students.

2 points: 55 students.

1 point: 23 students.

0 point: 2 students.

Unfair, not evaluated: 21 solutionss.

Problems in Physics of KöMaL, October 2005

360 students sent a solution.
3 points:	259 students.
2 points:	55 students.
1 point:	23 students.
0 point:	2 students.
Unfair, not evaluated:	21 solutionss.