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P. 3858. We would like to increase the length of a 160 cm long copper rod of cross section 4 mm^{2} by 1 mm. What is the energy absorbed by the rod if

a) the rod is stretched;

b) the rod is heated?

(4 points)

Deadline expired.

Statistics on problem P. 3858. 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.