IYPT 1990, Задачи на турнира — Задача 8. Segner’s wheel

Problems for the 3rd International Young Physicists’ Tournament

Critical edition

Olympiets Youth Center, Moscow, Soviet Union; June 7‒14, 1990 [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

Victories do not attract him.
For him growth means: profound defeat
at the hands of ever greater adversaries.
R. M. Rilke [3]

Условие

A Segner’s wheel rotates due to the reactive force of streams flowing out of the nozzles, when the wheel is placed into the water. Will it rotate backwards in a reverse regime, if the water is sucked into the nozzles, not flowing out of them? It is recommended to look through the book Surely You’re Joking, Mr. Feynman! (a partial Russian translation can be found in the “Nauka i zhizn” magazine, 1986, No. 12.) [5]

Note [5]

Translations by M. Shifman and O. L. Tikhodeeva of Surely You're Joking, Mr. Feynman! were published in the Soviet popular science magazine Nauka i zhizn in Nos. 10—12 (1986), Nos. 2—8 (1987) and in Uspekhi fizicheskikh nauk in No. 148, issue 3 (March 1986)

Решение

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