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Консультация № 201336
12.08.2021, 16:42
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Здравствуйте! У меня возникли сложности с таким вопросом:
Брусок массой 1 кг тянут по горизонтальной поверхности за лёгкую нерастяжимую нить. Сила натяжения нити равна 5 Н, и нить составляет угол 30? с поверхностью. Коэффициент трения между бруском и поверхностью равен 0,5, брусок движется поступательно. Найдите ускорение бруска. Ответ выразите в м/с2, округлив до сотых. Ускорение свободного падения считайте равным 10 м/с2.
Брусок массой 1 кг тянут по горизонтальной поверхности за лёгкую нерастяжимую нить. Сила натяжения нити равна 5 Н, и нить составляет угол 30? с поверхностью. Коэффициент трения между бруском и поверхностью равен 0,5, брусок движется поступательно. Найдите ускорение бруска. Ответ выразите в м/с2, округлив до сотых. Ускорение свободного падения считайте равным 10 м/с2.
Обсуждение
12.08.2021, 20:31
общий
это ответ
Здравствуйте, piq88384!
Предлагаю Вам следующее решение задачи.
Дано:
кг -- масса бруска, который тянут по горизонтальной поверхности; 
Н -- сила натяжения нити; 
-- угол, который нить составляет с горизонтальной поверхностью; 
-- коэффициент трения между бруском и горизонтальной поверхностью; 
м/с2 -- ускорение свободного падения.
Определить:
-- ускорение бруска.
Рисунок к решению задачи прикреплён.
В проекциях на координатные оси имеем
где
-- сила, действующая на брусок со стороны нити (она равна по величине силе натяжения нити), 
-- сила тяжести; 
-- нормальная реакция горизонтальной плоскости; 
-- сила трения, действующая на брусок со стороны горизонтальной поверхности.
Из уравнения (2) получим, что
Подставляя это выражение вместо в уравнение (1), будем иметь
(м/с2).
Ответ:
м/с2.
Предлагаю Вам следующее решение задачи.
Дано:
кг -- масса бруска, который тянут по горизонтальной поверхности; Н -- сила натяжения нити; -- угол, который нить составляет с горизонтальной поверхностью; -- коэффициент трения между бруском и горизонтальной поверхностью; м/с2 -- ускорение свободного падения.Определить:
-- ускорение бруска.Решение
Рисунок к решению задачи прикреплён.
В проекциях на координатные оси имеем
где
-- сила, действующая на брусок со стороны нити (она равна по величине силе натяжения нити), -- сила тяжести; -- нормальная реакция горизонтальной плоскости; -- сила трения, действующая на брусок со стороны горизонтальной поверхности.Из уравнения (2) получим, что
Подставляя это выражение вместо
в уравнение (1), будем иметь (м/с2).Ответ:
м/с2.
Прикрепленные файлы:
5
Об авторе:
Facta loquuntur.
Facta loquuntur.
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