IYPT 2012, Задачи на турнира — Задача 3. String of beads

IYPT 2012

Условие

Photograph of a hand holding a transparent beaker from which a string of dark beads rises in an arch above the rim before falling down; a face is partly visible in the background.
Picture “String of beads” © Hans Jordens and Leonid Markovich

A long string of beads is released from a beaker by pulling a sufficiently long part of the chain over the edge of the beaker. Due to gravity the speed of the string increases. At a certain moment the string no longer touches the edge of the beaker (see picture). Investigate and explain the phenomenon.

Решение

Внимание: Непълно решение

В архива няма официално решение на тази задача.

Оригинал в Архива: 2012.pdf