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Консультация № 199956
22.12.2020, 06:18
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
В сосуде теплоёмкостью 200 Дж/(∘C) находится литр воды при неизвестной начальной температуре. В сосуд кладут 500 г льда, взятых при температуре −20 ∘C. В сосуде устанавливается температура 10 ∘C. Определите начальную температуру воды в сосуде. Ответ дайте в ∘C, округлив до десятых. Теплообменом сосуда с окружающей средой пренебрегите. Удельная теплоёмкость воды cв=4200 Дж/(кг⋅∘C), удельная теплоёмкость льда cл=2100 Дж/(кг⋅∘C), удельная теплота плавления льда λ=330 кДж/кг.
В сосуде теплоёмкостью 200 Дж/(∘C) находится литр воды при неизвестной начальной температуре. В сосуд кладут 500 г льда, взятых при температуре −20 ∘C. В сосуде устанавливается температура 10 ∘C. Определите начальную температуру воды в сосуде. Ответ дайте в ∘C, округлив до десятых. Теплообменом сосуда с окружающей средой пренебрегите. Удельная теплоёмкость воды cв=4200 Дж/(кг⋅∘C), удельная теплоёмкость льда cл=2100 Дж/(кг⋅∘C), удельная теплота плавления льда λ=330 кДж/кг.
Обсуждение
24.12.2020, 09:52
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Добрый день! Насколько я понял, это задача из курса Сириуса по физике. Если это так, то ответ 57 градусов, решается эта задача через уравнение теплового баланса. На фото это видно (хоть и не очень), если в уравнение баланса подставить все значения этот ответ и получится. Успехов Вам!
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