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Консультация № 161798
02.03.2009, 11:27
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1
Азот нагревается при постоянном давлении, причём ему было сообщено количество теплоты Q=21кДж. Определить работу А, которую совершил при этом газ, и изменение его внутренней энергии ΔU.
Обсуждение
Неизвестный
06.03.2009, 23:55
общий
это ответ
Здравствуйте, Васильев Дмитрий Иванович!
Воспользуемся первым началом термодинамики Q=A+[$916$]U (1), с другой стороны Q=cp[$916$]T (2), а [$916$]U=iR[$916$]T/2 (3), где i=5 для двухатомного газа, также для такого газа cp=(i+2)R/2=3,5R. Тогда из (2) можно выразить [$916$]T и подставить в (3). Теперь мы знаем изменение внутренней энергии и из (1) определим искомую работу.
A=2Q/7=6 Дж. Удачи.
Воспользуемся первым началом термодинамики Q=A+[$916$]U (1), с другой стороны Q=cp[$916$]T (2), а [$916$]U=iR[$916$]T/2 (3), где i=5 для двухатомного газа, также для такого газа cp=(i+2)R/2=3,5R. Тогда из (2) можно выразить [$916$]T и подставить в (3). Теперь мы знаем изменение внутренней энергии и из (1) определим искомую работу.
A=2Q/7=6 Дж. Удачи.
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