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

Problem P. 4165. (May 2009)

P. 4165. Find the mass of that steel wire, which stores elastic potential energy of 10 J when it is expanded. The tensile strength of steal is 900 MPa. Its Young modulus is 210 GPa.

(4 pont)

Deadline expired on June 11, 2009.


Statistics:

91 students sent a solution.
4 points:74 students.
3 points:3 students.
2 points:6 students.
1 point:5 students.
Unfair, not evaluated:3 solutions.

Problems in Physics of KöMaL, May 2009