Ищу преподавателя по физике
(Знание немецкого языка очень приветствуется, хоть и не обязательно)
Нужно помочь решить задачи по следующим темам: Тепло и излучение. На решение 1 задачи дается около 20 минут.
Пример задачи:
Закрытый цилиндрический контейнер (Радиус R = 10 cm, Высота h = 40 cm, Толщина стенок d = 10 mm) наполнен водой T = 3°C и стоит на подставке которая постоянно охлаждается до Tp = –5°C.
Лампа светит на крышку контейнера Ee = 1000 W/m2.
Материал крышки: Коэффициент поглощения ε300K = 0.5 и ε6000K = 0.8. Теплопроводность λ = 10 W/(K m).
Помимо этого присутствует теплообмен с окружающей средой Tu = 25°C, коеффициент теплопередачи в окруж.среду α = 10 W/(K m2).
а) Через какое время вода станет 0°C?
б) Через какое время вся вода заледенеет?
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