IYPT 1991, Задачи на турнира — Задача 13. Wooden cube
Problems for the 4th International Young Physicists’ Tournament
Critical edition
Olympiets Youth Center, Moscow, Soviet Union; July 22‒28, 1991 [1]
Critical edition: translated, restored, and commented text [2]
FINAL DRAFT. — Please do not re-publish. Suggestions and criticism welcome
Translated, edited and commented by Ilya Martchenko. The original edition’s historical notes, sources and acknowledgments are retained with problem 1.
Епиграф
Is this black currant?
No, it is red currant.
But why is it white?
Because it is still green. [3]
Условие
A cube is cut out of a single piece of wood. The edge of the cube is much smaller than the diameter of the tree trunk from which it was cut out. Propose a method to determine the direction of wood fibers in the cube (the positive orientation of fibers is from the roots to the top of the tree.)
Решение
Внимание: Непълно решение
В архива няма официално решение на тази задача.
Оригинал в Архива: 1991.pdf