Mathematical and Physical Journal
for High Schools
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I want the old design back!!! :-)

Problem P. 3858. (January 2006)

P. 3858. We would like to increase the length of a 160 cm long copper rod of cross section 4 mm2 by 1 mm. What is the energy absorbed by the rod if

a) the rod is stretched;

b) the rod is heated?

(4 pont)

Deadline expired on February 13, 2006.


210 students sent a solution.
4 points:109 students.
3 points:23 students.
2 points:44 students.
1 point:12 students.
0 point:6 students.
Unfair, not evaluated:16 solutions.

Problems in Physics of KöMaL, January 2006