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Консультация № 196115
14.08.2019, 02:06
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Лежащее на горизонтальной поверхности тело приходит в движение под действием горизонтальной силы, составляющей η = 1/2 действующей на него силы тяжести. Сила действует некоторое время t, потом прекращает действовать. Найдите это время τ, если известно, что полный путь, пройденный телом до остановки, S = 15 м, а коэффициент трения µ = 0,2. g = 10 м/с2.
Лежащее на горизонтальной поверхности тело приходит в движение под действием горизонтальной силы, составляющей η = 1/2 действующей на него силы тяжести. Сила действует некоторое время t, потом прекращает действовать. Найдите это время τ, если известно, что полный путь, пройденный телом до остановки, S = 15 м, а коэффициент трения µ = 0,2. g = 10 м/с2.
Обсуждение
14.08.2019, 07:48
общий
это ответ
Здравствуйте, dar777!
Пока на тело действует указанная горизонтальная сила, его движение, в соответствии со вторым законом Ньютона, описывается уравнением
откуда
-- ускорение, с которым движется тело. При этом скорость тела равномерно увеличивается от 
до 
а пройденный путь составляет
Когда горизонтальная сила перестаёт действовать на тело, его движение описывается уравнением
откуда
-- ускорение, с которым движется тело. При этом скорость тела равномерно уменьшается от 
до 
а пройденный путь составляет
Далее имеем
(с).
Литература
Аксенович Л. А., Ракина Н. Н., Фарино К. С. Физика в средней школе. -- Минск: Адукацыя i выхаванне, 2004. -- 720 с.
Пока на тело действует указанная горизонтальная сила, его движение, в соответствии со вторым законом Ньютона, описывается уравнением
откуда
-- ускорение, с которым движется тело. При этом скорость тела равномерно увеличивается от до а пройденный путь составляетКогда горизонтальная сила перестаёт действовать на тело, его движение описывается уравнением
откуда
-- ускорение, с которым движется тело. При этом скорость тела равномерно уменьшается от до а пройденный путь составляетДалее имеем
(с).Литература
Аксенович Л. А., Ракина Н. Н., Фарино К. С. Физика в средней школе. -- Минск: Адукацыя i выхаванне, 2004. -- 720 с.
5
Это самое лучшее решение!
Об авторе:
Facta loquuntur.
Facta loquuntur.
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