IYPT 1991, Задачи на турнира — Задача 2. Fortune teller
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
When molten paraffin [7] is made to drip from a candle into a saucer with water, different solidified shapes are obtained, like a “lens”, a “boat”, an “inkblot”. Study the shape of the solidified droplets in dependence of altitude of their fall.
Note [6]
“Riddle”, in the Slovak text
Note [7]
“Wax”, in the Slovak text. “Paraffin (stearin)” in the French text
Решение
Внимание: Непълно решение
В архива няма официално решение на тази задача.
Оригинал в Архива: 1991.pdf