Problem P. 4364. (September 2011)

P. 4364. The figure shows two rods, a copper one and an aluminum one, which comes out of a wall. At a temperature of 20 ^oC the length of the copper rod is 2 m, and the length of the aluminum one is 1 m. The gap between them is 1.3 mm.

a) At what temperature will the gap disappear?

b) What is the size of the gap at a temperature of 0 ^oC?

(4 pont)

Deadline expired on October 10, 2011.

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

Megoldás. \(\displaystyle a)\) Kb. \(\displaystyle 42^\circ\)C-on záródik a rés.

\(\displaystyle b)\) Fagyponton kb. 2,5 mm-es a rés.

Statistics:

281 students sent a solution.
4 points:	215 students.
3 points:	41 students.
2 points:	17 students.
1 point:	7 students.
Unfair, not evaluated:	1 solutions.

Problems in Physics of KöMaL, September 2011