Предмет: Физика, автор: sadiqovsadiq555

Тело потеряла 300 Дж тепла и над ним совершилось работа 800 Дж как изменялось его внутреннее энергия? Х

Ответы

Автор ответа: sofyatimashkov

Q=U+A, где Q - кол-во теплоты, U - изменение внутренней энергии, а A - работа

Для начала разберемся со знаками.

Тело отдало тепло, значит у кол-ва теплоты будет знак -. Если бы тепло наоборот получалось, тогда стоял знак +.

Надо телом совершили работу, значит А тоже имеет знак -. Если бы работу совершало тело, то А была бы положительной.

-Q=U-A, выразим отсюда U

U=A-Q (Мы -A перенесли в правую часть к теплоте)

U=100-300

U=-200Дж

Внутренняя энергия уменьшилась на 200 Дж

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