IYPT 2003, Задачи на турнира — Задача 7. Oscillating box

16th IYPT (2003)

Заглавие в източника

Source: Problems for the 16th IYPT (fyrisskolan.uppsala.se, Oct. 6, 2002)
Selected at the Preparatory Seminar at Wik Castle on Oct. 4—6, 2002
Exemplary solutions for 2003 →

Условие

Take a box and divide it into a number of small cells with low walls. Distribute some small steel balls between the cells. When the box is made to oscillate vertically, the balls occasionally jump from one cell to another. Depending on the frequency and the amplitude of the oscillation, the distribution of the balls can become stable or unstable. Study this effect and use a model to explain it.

Решение

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Оригинал в Архива: 2003.txt