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Консультация № 178860
04.06.2010, 23:25
40.95 руб.
0
3
1
помогите решить!!! фигурист вращается вокруг неподвижной оси и делает 21об/с как изменится момент инерции фигуриста если он вытянул руки перпендикулярно туловищу при это частота вращения стала 7 об/с
если можно с описанием!
спасибо!
если можно с описанием!
спасибо!
Обсуждение
05.06.2010, 00:10
общий
это ответ
Здравствуйте, смирнов игорь.
Закон сохранения момента импульса (момента вращения): если на вращающуюся систему не действует внешний момент сил, суммарный момент импульса всех тел системы при их взаимодействии не меняется.
L=J1*[$969$]1=J2*[$969$]2
Отсюда следует
J2/J1=[$969$]1/[$969$]2=n1/n2=21/7=3
То есть момент инерции увеличился в 3 раза
Закон сохранения момента импульса (момента вращения): если на вращающуюся систему не действует внешний момент сил, суммарный момент импульса всех тел системы при их взаимодействии не меняется.
L=J1*[$969$]1=J2*[$969$]2
Отсюда следует
J2/J1=[$969$]1/[$969$]2=n1/n2=21/7=3
То есть момент инерции увеличился в 3 раза
05.06.2010, 00:11
общий
Shvetski:
Что значит кинетическая энергия не меняется? А как же работа центробежной силы? А закон сохранения момента импульса?
Да и обороты с радианами, похоже, перепутали
(хотя здесь это роли не играет)
Что значит кинетическая энергия не меняется? А как же работа центробежной силы? А закон сохранения момента импульса?
Да и обороты с радианами, похоже, перепутали
(хотя здесь это роли не играет)
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