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Консультация № 188483
20.12.2015, 15:14
0.00 руб.
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос: Определить силу, прижимающую друг к другу две стеклянные пластинки размером 100 см2, если расстояние между пластинками 0,02 мм и пространство между ними заполнено водой. Считать мениск вогнутым с диаметром равным расстоянию между пластинками.
Обсуждение
24.12.2015, 00:49
общий
это ответ
Здравствуйте, gamayunov.nikita!
Для полуцилиндрического мениска по формуле Лапласа изменение давления [$916$]p=[$963$]/r
где r=d/2=0,01 мм=10-5 м - радиус кривизны мениска
[$963$]=0,073 Н/м - коэффициент поверхностного натяжения
При площади пластинок
S=100 см2=0,01 м2
Прижимающая сила равна
F=[$916$]S[$916$]p=S[$963$]/r=0,01м[sup]2[/sup][$183$]0,073Н/м/10-5м=73 Н
Для полуцилиндрического мениска по формуле Лапласа изменение давления [$916$]p=[$963$]/r
где r=d/2=0,01 мм=10-5 м - радиус кривизны мениска
[$963$]=0,073 Н/м - коэффициент поверхностного натяжения
При площади пластинок
S=100 см2=0,01 м2
Прижимающая сила равна
F=[$916$]S[$916$]p=S[$963$]/r=0,01м[sup]2[/sup][$183$]0,073Н/м/10-5м=73 Н
5
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