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Консультация № 190261
10.12.2016, 09:30
0.00 руб.
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1
1
Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Нужно вычислить поверхностное натяжение жидкости и назвать ее, если для отрыва от поверхности жидкости квадратной рамки со стороной 8,75см потребовалась усилие 35*10^-1 Н. Масса рамки 2г.
Нужно вычислить поверхностное натяжение жидкости и назвать ее, если для отрыва от поверхности жидкости квадратной рамки со стороной 8,75см потребовалась усилие 35*10^-1 Н. Масса рамки 2г.
Обсуждение
11.12.2016, 10:47
общий
это ответ
Здравствуйте, ribak-sudak!
По-моему, задачу можно решить так. Сила
которую нужно приложить к квадратной рамке, расположенной на поверхности жидкости, имеющей сторону 
чтобы оторвать её от этой поверхности, действует против силы тяжести 
и силы поверхностного натяжения жидкости 
То есть
или
что в проекциях на вертикальную ось даёт
(Н/м).
Чтобы установить, какая жидкость имелась в виду составителем задачи, нужно располагать таблицей коэффициентов поверхностного натяжения жидкостей, которая была в его распоряжении. У меня её нет. Рискну предположить, что в записанном Вами условии задачи допущена ошибка и должно быть
Н. Тогда 
Н/м, или 
мН/м, что соответствует спирту, наверное, этиловому 
при 
(см. здесь).
По-моему, задачу можно решить так. Сила
которую нужно приложить к квадратной рамке, расположенной на поверхности жидкости, имеющей сторону чтобы оторвать её от этой поверхности, действует против силы тяжести и силы поверхностного натяжения жидкости То естьили
что в проекциях на вертикальную ось даёт
(Н/м).Чтобы установить, какая жидкость имелась в виду составителем задачи, нужно располагать таблицей коэффициентов поверхностного натяжения жидкостей, которая была в его распоряжении. У меня её нет. Рискну предположить, что в записанном Вами условии задачи допущена ошибка и должно быть
Н. Тогда Н/м, или мН/м, что соответствует спирту, наверное, этиловому при (см. здесь).
5
спасибо большое, я ваш должник
Об авторе:
Facta loquuntur.
Facta loquuntur.
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