IYPT 1992, Задачи на турнира — Задача 4. Swing

Problems for the 5th International Young Physicists’ Tournament

Critical edition

Protvino, Russia, June 24‒July 1, 1992 [1]

Critical edition: corrected and commented official translation [2]

FINAL DRAFT. — Please do not re-publish. Suggestions and criticism welcome

Edited and commented by Ilya Martchenko. The original edition’s historical notes, sources and acknowledgments are retained with problem 1.

Условие

A special swing (trapeze) is used to train air and space pilots. [11] This device is able to make a loop around the horizontal axis. [12] What minimum time is necessary to build up the motion of the swing from the rest at the equilibrium position, to an amplitude of 180°? [13]

Note [11]

A special term looping («лопинг») is omitted in all translations. This term, a noun, is not colloquial in Russian language and describes a rotating swing driven solely by the person who uses it

Note [12]

”This device is able to make a loop around horizontal axis around which it swings”, according to [Kopelevich 1992]

Note [13]

The last part of the phrase, introducing the distance L, is in the Russian text, “for a person who is trained on the swing with a distance L between the axis of revolution and the deck?”

Решение

---

Оригинал в Архива: 1992.pdf