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Консультация № 193880
11.11.2018, 15:01
0.00 руб.
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Подвижный поршень весом mg, подвешенный на пружине, делит объем вертикально расположенного пустого цилиндра на две части . В положении равновесия высота нижней части цилиндра H0, удлинение пружины x0. В нижнюю часть цилиндра впускают ν молей воздуха. После установления равновесия пружина оказывается сжатой. Величина деформации сжатой пружины x1=αx0 (α=2). После этого воздух медленно охлаждают до некоторой температуры, так что в конечном состоянии деформация сжатой пружины x2=αx0/2.
1) Найти конечную температуру воздуха.
2) Найти работу, совершенную воздухом в процессе охлаждения.
Подвижный поршень весом mg, подвешенный на пружине, делит объем вертикально расположенного пустого цилиндра на две части . В положении равновесия высота нижней части цилиндра H0, удлинение пружины x0. В нижнюю часть цилиндра впускают ν молей воздуха. После установления равновесия пружина оказывается сжатой. Величина деформации сжатой пружины x1=αx0 (α=2). После этого воздух медленно охлаждают до некоторой температуры, так что в конечном состоянии деформация сжатой пружины x2=αx0/2.
1) Найти конечную температуру воздуха.
2) Найти работу, совершенную воздухом в процессе охлаждения.
Прикрепленные файлы:
Обсуждение
14.11.2018, 10:07
общий
Адресаты:
Посетите, пожалуйста, эту консультацию.
Об авторе:
Facta loquuntur.
Facta loquuntur.
14.11.2018, 11:37
общий
Прошу уважаемых экспертов извинить меня, не являющегося экспертом по физике, за беспокойство. Я надеюсь, что вы сообщите свои мнения о решении задачи, которое я предлагаю ниже. Тем самым я надеюсь застраховать себя от грубых ошибок.
Рассмотрим процесс применительно к 1 моль гелия.
На участке
имеем 
поэтому на этом участке
Для этого участка с учётом формулы
Из закона сохранения полной энергии на участке
получим
Сопоставляя выражения
получим, что
Полученный ответ правильный для некоторого определённого диапазона температур, в котором для двухатомного газа, каковым является гелий,
При более низких температурах 
Тогда 
Рассмотрим процесс применительно к 1 моль гелия.
На участке
имеем поэтому на этом участкеДля этого участка с учётом формулы
Из закона сохранения полной энергии на участке
получимСопоставляя выражения
получим, чтоПолученный ответ правильный для некоторого определённого диапазона температур, в котором для двухатомного газа, каковым является гелий,
При более низких температурах Тогда
Об авторе:
Facta loquuntur.
Facta loquuntur.
Оно должно быть 
Форма ответа
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