IYPT 2008, Задачи на турнира — Задача 13. Spinning ice

21st IYPT (2008)

Заглавие в източника

Source: Problems for 21st for IYPT, Croatia 2008 (iypt.org, Aug. 8, 2007)
Selected at the IOC meeting in Seoul on July 12—13, 2007; released as Preliminary on July 18, 2007; as final on Aug. 8, 2007
Reference Kit for 2008 (final edition, May 28, 2008) →
Exemplary solutions for 2008 →

Условие

Pour very hot water into a cup and stir it so the water rotates slowly. Place a small ice cube at the centre of the rotating water. The ice cube will spin faster than the water around it. Investigate the parameters that influence the ice rotation.

Решение

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Оригинал в Архива: 2008.txt