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Консультация № 191716
09.11.2017, 18:54
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Здравствуйте! Прошу помощи в следующем вопросе:
в цилиндрический сосуд, наполненный глицерином, бросают алюминиевый шарик диаметром d = 6 см. Определить при какой скорости падение шарика станет равномерным. Коэффициент вязкости глицерина n = 1,4 Нс/м2.
в цилиндрический сосуд, наполненный глицерином, бросают алюминиевый шарик диаметром d = 6 см. Определить при какой скорости падение шарика станет равномерным. Коэффициент вязкости глицерина n = 1,4 Нс/м2.
Обсуждение
11.11.2017, 07:19
общий
это ответ
Здравствуйте, Lera!
кг/м3 -- плотность алюминия;
-- плотность глицерина;
Па[$183$]с -- коэффициент динамической вязкости глицерина;
м/с2 -- ускорение свободного падения;
м -- диаметр шарика;
-- объём шарика;
-- скорость установившегося движения шарика.
На шарик, падающий в глицерине, действуют следующие силы:
-- направленная вниз сила тяжести
-- направленная вверх выталкивающая сила
-- направленная вверх сила сопротивления движению
В некоторый момент времени сила тяжести будет уравновешена суммой двух других сил, и с этого момента шарик будет падать со скоростью, имеющей величину
то есть
откуда получим
(м/с).
кг/м3 -- плотность алюминия; -- плотность глицерина; Па[$183$]с -- коэффициент динамической вязкости глицерина; м/с2 -- ускорение свободного падения; м -- диаметр шарика; -- объём шарика; -- скорость установившегося движения шарика.На шарик, падающий в глицерине, действуют следующие силы:
-- направленная вниз сила тяжести
-- направленная вверх выталкивающая сила
-- направленная вверх сила сопротивления движению
В некоторый момент времени сила тяжести будет уравновешена суммой двух других сил, и с этого момента шарик будет падать со скоростью, имеющей величину
то естьоткуда получим
(м/с).
Об авторе:
Facta loquuntur.
Facta loquuntur.
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