IYPT 2002, Задачи на турнира — Задача 13. Spinning ball

15th IYPT (2002)

Заглавие в източника

Source: iypt.org.ua, before Jan. 8, 2002
Selected at the Preparatory Seminar in Odessa on Oct. 11—14, 2001
Exemplary solutions for 2002 →

Условие

A steel ball of diameter 2—3 cm is put on a horizontal plate. Invent and construct a device, which allows you to spin the ball at high angular velocity around a vertical axis. The device should have no mechanical contact with the ball.

Решение

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Оригинал в Архива: 2002.txt