IYPT 1994, Задачи на турнира — Задача 6. Acceleration

7th IYPT (1994)

Условие

Gravitation machine (problems 4, 5, 6). A horizontal plate (a vibrator) oscillates harmonically up and down. A steel ball put an the surface of the plate starts jumping higher or lower. For the experimental device one may successfully use a ferrite core in a coil connected to an alternating current generator (a sound generator). The butt-end of the ferrite core will play the part of the vibrating horizontal plane. Steel balls of diameter 1 or 2 mm are suitable for the experiment. The glass tube approximately 1 m long can also be very helpful.

The mechanical energy of the ball changes after every impact. The mean mechanical energy (averaged over all successive impacts) increases at the beginning of the process and then tends to a constant value. Try to obtain experimentally the time dependence of the mean mechanical energy of the ball.

Решение

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Оригинал в Архива: 1994.txt