IYPT 1991, Задачи на турнира — Задача 3. Geyser

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 strong ceramic resistor in the shape of a hollow cylinder is placed into water so that the axis of the cylinder is vertical, and the top plane is slightly below [8] the water level. If electric current is passed through the resistor, the resistor, just like a geyser, periodically ejects portions of hot water upwards. Calculate and study experimentally the dependence of the eruption periods of the “geyser” on the power consumed by the resistor from the power supply unit. [9]

Note [8]

“Top plane is slightly above or slightly below the water level”, in the 1991 English, Slovak, 1992 Czech, 1996 Czech, 2006 English translations

Note [9]

“On the current delivered from the power supply”, in several translations. “On the power of current”, in the 1991 English and 2006 English texts. “On the power of voltage source”, in the Czech text

Решение

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Оригинал в Архива: 1991.pdf