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Консультация № 201250
30.06.2021, 11:58
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Небольшой брусок массой 0,5 кг соскальзывает вниз по гладкой плоскости, наклонённой под углом ?=30? к горизонту, с постоянным ускорением 2 м/с2. Брусок движется поступательно. Его тормозят с помощью натянутой нити, которая составляет с наклонной плоскостью угол ?=45? (см. рисунок). Найдите силу, с которой брусок давит на поверхность. Ускорение свободного падения считать равным g?10 м/с2. Ответ выразите в Н, округлив до десятых.
Небольшой брусок массой 0,5 кг соскальзывает вниз по гладкой плоскости, наклонённой под углом ?=30? к горизонту, с постоянным ускорением 2 м/с2. Брусок движется поступательно. Его тормозят с помощью натянутой нити, которая составляет с наклонной плоскостью угол ?=45? (см. рисунок). Найдите силу, с которой брусок давит на поверхность. Ускорение свободного падения считать равным g?10 м/с2. Ответ выразите в Н, округлив до десятых.
Обсуждение
30.06.2021, 18:40
общий
это ответ
Здравствуйте, kuznetsova.79!
Предлагаю Вам следующее решение задачи.
Дано: рисунок (в сообщении, открывающем консультацию);
кг; 
м/с2 -- ускорение бруска; 
м/с2.
Определить:
-- силу, с которой брусок давит на наклонную плоскость.
Брусок движется ускоренно вниз по наклонной плоскости под действием силы тяжести
силы нормальной реакции 
наклонной плоскости, силы 
натяжения нити (рисунок в прикреплённом файле). Составляя уравнения движения бруска в проекциях на координатные оси, получим
откуда
то есть
(Н).
Эта сила приложена к бруску и направлена так, как показано на рисунке. Согласно третьему закону Ньютона, брусок действует на наклонную плоскость с такой же по величине силой
приложенной к наклонной плоскости и направленной в противоположную сторону.
Ответ:
Н.
Предлагаю Вам следующее решение задачи.
Дано: рисунок (в сообщении, открывающем консультацию);
кг; м/с2 -- ускорение бруска; м/с2.Определить:
-- силу, с которой брусок давит на наклонную плоскость.Решение
Брусок движется ускоренно вниз по наклонной плоскости под действием силы тяжести
силы нормальной реакции наклонной плоскости, силы натяжения нити (рисунок в прикреплённом файле). Составляя уравнения движения бруска в проекциях на координатные оси, получимоткуда
то есть
(Н).Эта сила приложена к бруску и направлена так, как показано на рисунке. Согласно третьему закону Ньютона, брусок действует на наклонную плоскость с такой же по величине силой
приложенной к наклонной плоскости и направленной в противоположную сторону.Ответ:
Н.
Прикрепленные файлы:
5
Об авторе:
Facta loquuntur.
Facta loquuntur.
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