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В ванну налили 50 л горячей воды при температуре 55*С и 25 л воды при температуре 10*С. перемешав воду, измеряли температуру смеси. Она оказалась равной 40*С. Определите количество теплоты, отданное горячей водой и полученное холодной водой.
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Предположим, что масса 1 л воды равна 1 кг с=4200 Дж/кг·град удельная теплоемкость воды Рассчитаем количество теплоты отданое горячей водой Q1=c·m1·ΔT Q1=4200·50·(55-40) Q1=3150000 Дж Рассчитаем количество теплоты, поглотившееся холодной водой Q2=4200·25·(40-10) Q2=3150000 Дж Значит в нашем опыте потери тепла отсутствуют. Вся энергия горячей воды ушла на нагревание холодной.Это практически нереально, потому что ванная имеет теплоемкость и должна поглотить часть энергии, иначе ее необходимо предварительно нагреть до 40°С
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Автор:
erinboyd - 5 лет назад
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