IOM 2016, Блиц — Задача 54

Olympiad of Metropolises, Moscow. Blitz Contest, September, 5 · 5 септември 2016 г.

Условие

The answer should be given in SI-units and rounded to the nearest integer, unless otherwise is stated. $g = 10$ m/s$^2$.

A mole of helium expands according to the law $p = \alpha/V^2$ ($\alpha = const$ and $P$ is pressure), so that its volume increases twofold and the internal energy decreases by $\Delta U = 2493$ J. Determine the helium initial temperature. $R = 8.31$ J/(mol K).

Решение

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Оригинал в Архива: blitz.pdf