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Консультация № 200759
29.04.2021, 14:57
0.00 руб.
1
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Здравствуйте! У меня возникли сложности с таким вопросом:
Тонкий обруч радиусом 1 м, способный свободно вращаться вокруг горизонтальной оси, проходящей через точку О перпендикулярно плоскости рисунка, отклонили от вертикали на угол 90° и отпустили. В начальный момент времени угловое ускорение обруча равно:
а) 20 с^–2 б) 7 с^–2 в) 5 с^–2 г) 10 с^–2
Тонкий обруч радиусом 1 м, способный свободно вращаться вокруг горизонтальной оси, проходящей через точку О перпендикулярно плоскости рисунка, отклонили от вертикали на угол 90° и отпустили. В начальный момент времени угловое ускорение обруча равно:
а) 20 с^–2 б) 7 с^–2 в) 5 с^–2 г) 10 с^–2
Прикрепленные файлы:
Обсуждение
01.05.2021, 06:47
общий
01.05.2021, 06:49
это ответ
Здравствуйте, Дмитрий!
Предлагаю Вам следующее решение задачи.
Дано:
м -- радиус обруча, способного свободно вращаться вокруг горизонтальной оси, проходящей через точку 
перпендикулярно плоскости рисунка; рисунок.
Определить:
-- угловое ускорение обруча в начальный момент времени.
Момент инерции обруча относительно его оси вращения составляет, в соответствии с теоремой Гюйгенса -- Штайнера,
где 
-- момент инерции обруча относительно его оси симметрии, параллельной его оси вращения; 
-- масса обруча. Момент внешних сил, действующих на обруч в начальный момент времени, равен 
В соответствии с основным уравнением динамики вращательного движения, имеем 
(с-2).
Ответ:
с-2.
Предлагаю Вам следующее решение задачи.
Дано:
м -- радиус обруча, способного свободно вращаться вокруг горизонтальной оси, проходящей через точку перпендикулярно плоскости рисунка; рисунок.Определить:
-- угловое ускорение обруча в начальный момент времени.Решение
Момент инерции обруча относительно его оси вращения составляет, в соответствии с теоремой Гюйгенса -- Штайнера,
где -- момент инерции обруча относительно его оси симметрии, параллельной его оси вращения; -- масса обруча. Момент внешних сил, действующих на обруч в начальный момент времени, равен В соответствии с основным уравнением динамики вращательного движения, имеем (с-2).Ответ:
с-2.
5
Об авторе:
Facta loquuntur.
Facta loquuntur.
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