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Консультация № 188617
08.01.2016, 15:29
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Уважаемые эксперты! Пожалуйста, помогите с задачами:
1. Конькобежец катил груженные сани по льду со скоростью 5 м/с, а затем толкнул их вперед и отпустил. С какой скоростью покатится конькобежец непосредственно после толчка, если скорость саней возросла до 8 м/с? Масса саней 90 кг, масса человека 60 кг. В ответе укажите модуль скорости.
2.Камень брошен вертикально вверх со скоростью 50 м/с. Через сколько секунд его скорость будет равна 30 м/с и направлена вертикально вниз?
1. Конькобежец катил груженные сани по льду со скоростью 5 м/с, а затем толкнул их вперед и отпустил. С какой скоростью покатится конькобежец непосредственно после толчка, если скорость саней возросла до 8 м/с? Масса саней 90 кг, масса человека 60 кг. В ответе укажите модуль скорости.
2.Камень брошен вертикально вверх со скоростью 50 м/с. Через сколько секунд его скорость будет равна 30 м/с и направлена вертикально вниз?
Обсуждение
08.01.2016, 17:54
общий
это ответ
Здравствуйте, evgesha_018!
1. Обозначим
- масса саней;
- масса конькобежца;
- скорость саней и конькобежца до толчка;
- скорость саней после толчка;
- скорость конькобежца после толчка.
По закону сохранения импульса (количества движения)
что после подстановки числовых значений величин даёт
2. Обозначим
- начальная скорость камня;
- конечная скорость камня.
В проекции на вертикальную ось можно записать
и получить
С уважением.
1. Обозначим
- масса саней; - масса конькобежца; - скорость саней и конькобежца до толчка; - скорость саней после толчка; - скорость конькобежца после толчка.По закону сохранения импульса (количества движения)
что после подстановки числовых значений величин даёт
2. Обозначим
- начальная скорость камня; - конечная скорость камня.В проекции на вертикальную ось можно записать
и получить
С уважением.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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