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Консультация № 189819
26.09.2016, 01:18
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Здравствуйте! Прошу помощи в следующем вопросе:
Прикрепленные файлы:
Обсуждение
27.09.2016, 09:40
общий
это ответ
Здравствуйте, moonfox!
На цилиндр действуют силы
и 
Эти силы не параллельны и лежат в одной плоскости. По теореме о трёх силах, если тело находится в равновесии под действием трёх непараллельных сил, то линии действия этих сил пересекаются в одной точке. В рассматриваемой задаче такой точкой является точка 
Система сил, действующих на цилиндр, является сходящейся. Треугольник, построенный из этих сил, должен быть замкнутым.
Вычислим неизвестные силы графо-аналитическим способом. От произвольной точки
отложим вниз направленный отрезок 
изображающий силу 
затем через точку 
проводим прямую, параллельную направлению силы 
а через точку - прямую, параллельную направлению силы Третья вершина треугольника сил находится в точке 
пересечения указанных прямых. Направление сил можно определить по правилу стрелок: равнодействующая сил равна нулю, поэтому при обходе треугольника по контуру острия стрелок направленных отрезков нигде не должны встречаться.
Рассматривая полученный треугольник, видим, что угол при вершине равен углу 
потому что стороны этих острых углов взаимно перпендикулярны. Поэтому при 
получим
(H),
(H).
На цилиндр действуют силы
и Эти силы не параллельны и лежат в одной плоскости. По теореме о трёх силах, если тело находится в равновесии под действием трёх непараллельных сил, то линии действия этих сил пересекаются в одной точке. В рассматриваемой задаче такой точкой является точка Система сил, действующих на цилиндр, является сходящейся. Треугольник, построенный из этих сил, должен быть замкнутым.Вычислим неизвестные силы графо-аналитическим способом. От произвольной точки
отложим вниз направленный отрезок изображающий силу затем через точку проводим прямую, параллельную направлению силы а через точку - прямую, параллельную направлению силы Третья вершина треугольника сил находится в точке пересечения указанных прямых. Направление сил можно определить по правилу стрелок: равнодействующая сил равна нулю, поэтому при обходе треугольника по контуру острия стрелок направленных отрезков нигде не должны встречаться.Рассматривая полученный треугольник, видим, что угол при вершине
равен углу потому что стороны этих острых углов взаимно перпендикулярны. Поэтому при получим (H), (H).
Об авторе:
Facta loquuntur.
Facta loquuntur.
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