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Консультация № 191867
23.11.2017, 20:46
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Задача по физике.
Теплоемкость стального шара V=100см^3 равна 300 Дж./°С. Имеет ли этот шарик полость?
Задача по физике.
Теплоемкость стального шара V=100см^3 равна 300 Дж./°С. Имеет ли этот шарик полость?
Обсуждение
23.11.2017, 22:33
общий
это ответ
Здравствуйте, Naking!
Дано:
Сталь
V=100 cм3=10-4 м3
С=300 Дж/[$186$]С
Найти.... ?
Решение
Думаю, что можно найти теплоемкость стального (без пустот) тела указанного объема и сравнить с теплоемкостью шара.
Итак
Теплоёмкость C=c*m=c*[$961$]*V
Здесь c=500 Дж/кг*[$186$]С - удельная теплоёмкость стали, [$961$] - плотность стали (по справочнику Еноховича может быть от 7700 до 7900 кг/м3). Примем для верности нижний предел (7700 кг/м3)
После подстановки получаем
C=500*7700*10-4=385 Дж/[$186$]С
То есть, полученное значение больше указанного в условии, следовательно можно сделать вывод, что в шаре есть пустоты.
Удачи
Дано:
Сталь
V=100 cм3=10-4 м3
С=300 Дж/[$186$]С
Найти.... ?
Решение
Думаю, что можно найти теплоемкость стального (без пустот) тела указанного объема и сравнить с теплоемкостью шара.
Итак
Теплоёмкость C=c*m=c*[$961$]*V
Здесь c=500 Дж/кг*[$186$]С - удельная теплоёмкость стали, [$961$] - плотность стали (по справочнику Еноховича может быть от 7700 до 7900 кг/м3). Примем для верности нижний предел (7700 кг/м3)
После подстановки получаем
C=500*7700*10-4=385 Дж/[$186$]С
То есть, полученное значение больше указанного в условии, следовательно можно сделать вывод, что в шаре есть пустоты.
Удачи
Об авторе:
С уважением
shvetski
С уважением
shvetski
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