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Консультация № 162601
17.03.2009, 19:50
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Добрый вечер, хотелось бы узнать решение этой задачи.
Через какое время t диск, к которому приложена сила F=100 H по углом 30 градусов , начнет вращаться со скоростью 2 рад/с?Так же известно: масса диска m=10 кг и радиус диска R=0,2 метра.
заранее спасибо
Через какое время t диск, к которому приложена сила F=100 H по углом 30 градусов , начнет вращаться со скоростью 2 рад/с?Так же известно: масса диска m=10 кг и радиус диска R=0,2 метра.
заранее спасибо
Обсуждение
18.03.2009, 10:06
общий
Немного не ясно, где угол в 30 градусов. Будем считать между направлением на центр диска и направ. действия силы, и этот угол сохраняется при разгоне диска. Тогда закон сохранения момента кол-ва дв-я будет выглядеть так:
((m*R^2)/2)*(dw/dt) = R*sin(30)*F
(dw/dt) = 50
w = w0 + 50*t
2 = 50*t
t = 0.04 c
((m*R^2)/2)*(dw/dt) = R*sin(30)*F
(dw/dt) = 50
w = w0 + 50*t
2 = 50*t
t = 0.04 c
Форма ответа
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