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Консультация № 181074
03.12.2010, 04:37
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1
Здравствуйте, уважаемые эксперты! Прошу Вас ответить на следующий вопрос:
Вычислить величину коэффициента поверхностного натяжения для раствора, если для отрыва рамки прямоугольного сечения со сторонами l1 = 6 см и l2 = 4 см приложена сила F = 85 мН.
Вычислить величину коэффициента поверхностного натяжения для раствора, если для отрыва рамки прямоугольного сечения со сторонами l1 = 6 см и l2 = 4 см приложена сила F = 85 мН.
Обсуждение
03.12.2010, 08:16
общий
это ответ
Здравствуйте, Иван Петрович!
Дано: l1 = 6 см = 0,06 м, l2 = 4 см = 0,04 м, F = 85 мН = 85 ∙ 10-3 Н.
Определить: σ.
Решение.
Приложенная сила должна быть не меньше, чем сумма веса P рамки и силы поверхностного натяжения Fн = σL, где L – длина границы соприкосновения рамки с раствором. Поскольку рамка соприкасается с раствором внутренней и внешней сторонами, то
L = 2 ∙ 2 ∙ (l1 + l2) = 4(l1 + l2). Рамка, как следует из условия задачи, считается невесомой. Поэтому F = Fн = 4σ(l1 + l2),
σ = Fн/(4(l1 + l2)) = 85 ∙ 10-3/(4 ∙ (0,06 + 0,04)) ≈ 0,21 (Н/м).
Ответ: 0,21 Н/м.
С уважением.
Дано: l1 = 6 см = 0,06 м, l2 = 4 см = 0,04 м, F = 85 мН = 85 ∙ 10-3 Н.
Определить: σ.
Решение.
Приложенная сила должна быть не меньше, чем сумма веса P рамки и силы поверхностного натяжения Fн = σL, где L – длина границы соприкосновения рамки с раствором. Поскольку рамка соприкасается с раствором внутренней и внешней сторонами, то
L = 2 ∙ 2 ∙ (l1 + l2) = 4(l1 + l2). Рамка, как следует из условия задачи, считается невесомой. Поэтому F = Fн = 4σ(l1 + l2),
σ = Fн/(4(l1 + l2)) = 85 ∙ 10-3/(4 ∙ (0,06 + 0,04)) ≈ 0,21 (Н/м).
Ответ: 0,21 Н/м.
С уважением.
5
Спасибо!!!
Об авторе:
Facta loquuntur.
Facta loquuntur.
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