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Консультация № 196335
09.09.2019, 10:35
0.00 руб.
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Радиус-вектор материальной точки изменяется со временем по закону: r=3t^3i-2t^2j+tk,м , где векторы i,j,k являются ортами декартовой системы координат. За первую секунду движения равнодействующая сила совершила работу 19,4 Дж. Чему равна масса данной материальной точки?
Радиус-вектор материальной точки изменяется со временем по закону: r=3t^3i-2t^2j+tk,м , где векторы i,j,k являются ортами декартовой системы координат. За первую секунду движения равнодействующая сила совершила работу 19,4 Дж. Чему равна масса данной материальной точки?
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Обсуждение
09.09.2019, 15:29
общий
это ответ
Здравствуйте, gena.sorbuchev!
Имеем
-- закон изменения со временем вектора скорости материальной точки [1, с. 12];
-- координаты вектора скорости материальной точки в момент времени
(м/с)
-- модуль скорости материальной точки в момент времени
-- координаты вектора скорости материальной точки в момент времени
с;
(м/с)
-- модуль скорости материальной точки в момент времени с;
согласно закону изменения механической энергии [1, с. 71],
откуда
(кг)
-- масса материальной точки.
Литература
1. Яворский Б. М., Детлаф А. А., Лебедев А. К. Справочник по физике для инженеров и студентов вузов. -- М.: ООО "Издательство Оникс", 2007. -- 1056 с.
Имеем
-- закон изменения со временем вектора скорости материальной точки [1, с. 12];
-- координаты вектора скорости материальной точки в момент времени
(м/с)-- модуль скорости материальной точки в момент времени
-- координаты вектора скорости материальной точки в момент времени
с; (м/с)-- модуль скорости материальной точки в момент времени
с;согласно закону изменения механической энергии [1, с. 71],
откуда
(кг)-- масса материальной точки.
Литература
1. Яворский Б. М., Детлаф А. А., Лебедев А. К. Справочник по физике для инженеров и студентов вузов. -- М.: ООО "Издательство Оникс", 2007. -- 1056 с.
5
Об авторе:
Facta loquuntur.
Facta loquuntur.
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