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Консультация № 201367
27.08.2021, 11:05
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Здравствуйте! Прошу помощи в следующем вопросе:
По двум направляющим — вертикальной и горизонтальной — скользят два груза, соединённых жёстким прямым стержнем. В некоторый момент времени верхний груз движется вниз со скоростью 2 м/с, а стержень составляет с горизонтом угол 60?. Найдите скорость нижнего груза в этот момент. Ответ выразите в м/с, округлив до десятых.
По двум направляющим — вертикальной и горизонтальной — скользят два груза, соединённых жёстким прямым стержнем. В некоторый момент времени верхний груз движется вниз со скоростью 2 м/с, а стержень составляет с горизонтом угол 60?. Найдите скорость нижнего груза в этот момент. Ответ выразите в м/с, округлив до десятых.
Обсуждение
27.08.2021, 14:23
общий
27.08.2021, 14:24
это ответ
Здравствуйте, Михаил!
Предлагаю Вам следующее решение задачи.
Дано:
м/с -- мгновенная скорость первого груза, направленная вертикально вниз; 
-- угол, который стержень, соединяющий первый и второй грузы, составляет с горизонтом.
Определить:
-- мгновенную скорость второго груза, направленную горизонтально.
Воспользуемся теоремой о проекциях скоростей двух точек тела: проекции скоростей двух точек твёрдого тела на ось, проходящую через эти точки, равны друг другу. Тогда получим (рисунок прикреплён)
(м/с).
Ответ:
м/с.
Предлагаю Вам следующее решение задачи.
Дано:
м/с -- мгновенная скорость первого груза, направленная вертикально вниз; -- угол, который стержень, соединяющий первый и второй грузы, составляет с горизонтом.Определить:
-- мгновенную скорость второго груза, направленную горизонтально.Решение
Воспользуемся теоремой о проекциях скоростей двух точек тела: проекции скоростей двух точек твёрдого тела на ось, проходящую через эти точки, равны друг другу. Тогда получим (рисунок прикреплён)
(м/с).Ответ:
м/с.
Прикрепленные файлы:
Об авторе:
Facta loquuntur.
Facta loquuntur.
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