Съдържание

Условие Note [17]Note [18]Note [19]Note [20]Решение

IYPT 1991, Задачи на турнира — Задача 10. Blowgun

Оригинал на условието (PDF)Съобщи за грешка

Всички материали от IYPT 1991

Problems for the 4th International Young Physicists’ Tournament

Critical edition

Olympiets Youth Center, Moscow, Soviet Union; July 22‒28, 1991 [1]

Critical edition: translated, restored, and commented text [2]

FINAL DRAFT. — Please do not re-publish. Suggestions and criticism welcome

Translated, edited and commented by Ilya Martchenko. The original edition’s historical notes, sources and acknowledgments are retained with problem 1.

Епиграф

Is this black currant?
No, it is red currant.
But why is it white?
Because it is still green. [3]

Условие

A small knitting needle, [18] with two rounded pieces of polyurethane foam [19] strung onto it, is shot [20] out of a blowgun. Find the optimal blowpipe size to shoot such a projectile. What maximum projectile speed did you succeed to achieve?

Note [17]

“Hunter’s gun”, according to the 1991 English text

Note [18]

Wording about the needle and its size varies across the translations.

Note [19]

“Porolon”, a transliterated Russian name for a particular foamy material («поролон»), as it reads in the 1991 English, “paralon” in the 1996 Czech and 2006 English texts. It reads “polystyrene” in the 1992 Czech text, and “foam rubber” in the French text

Note [20]

“Is shot centrally”, in the Slovak text

Решение

Внимание: Непълно решение

В архива няма официално решение на тази задача.

Оригинал в Архива: 1991.pdf