Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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Problem P. 4090. (September 2008)

P. 4090. A 20-cm long, thin ruler of mass 0.05 kg is lying on the top of a horizontal air-cushioned table. At one moment the ruler is at rest and then at one end of the ruler a horizontal force of magnitude 0.1 N is exerted on it, perpendicularly to the longest side of the ruler. Find the acceleration of the other end of the ruler at which it starts to move.

(5 pont)

Deadline expired on October 13, 2008.


119 students sent a solution.
5 points:54 students.
4 points:30 students.
3 points:10 students.
2 points:8 students.
1 point:11 students.
0 point:4 students.
Unfair, not evaluated:2 solutions.

Problems in Physics of KöMaL, September 2008