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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Первая задача: Точка совершает гармонические колебания с частотой 0,5 Гц, амплитудой 5 см и нулевой начальной фазой. Для момента времени, в который смещение точки от положения равновесия равно 2,5 см, найти: 0) скорость точки; 1) модуль ее ускорения.
Вторая задача:Точка колеблется по закону: Х = 0,05sin (2t) м. В момент, когда возвращающая сила достигает значения 0,005 Н, а потенциальная энергия 100 мкДж, найти: 4) фазу колебаний в радианах; 5) частоту колебаний; 6) полную энергию; 7) массу точки; 8) ее кинетическую энергию.
Можете, пожалуйста, прислать ответ на alina.anischenko@mail.ru
Первая задача: Точка совершает гармонические колебания с частотой 0,5 Гц, амплитудой 5 см и нулевой начальной фазой. Для момента времени, в который смещение точки от положения равновесия равно 2,5 см, найти: 0) скорость точки; 1) модуль ее ускорения.
Имеем Гц -- частота колебаний материальной точки; (рад/с) -- циклическая частота колебаний материальной точки [1, с. 287]; см -- амплитуда колебаний материальной точки; рад -- начальная фаза колебаний материальной точки; 2,5 см -- смещение материальной точки от положения равновесия в некоторый момент времени.
Пусть смещение материальной точки от положения равновесия изменяется с течением времени по закону
[1, с. 287]. Тогда в соответствии с исходными данными в Вашем случае
см
-- закон изменения смещения материальной точки от положения равновесия с течением времени;
с
-- ближайший к начальному момент времени, в который смещение материальной точки равно см;
см/с
-- закон изменения проекции скорости материальной точки на ось с течением времени [1, с. 288];
(см/с)
-- искомая скорость материальной точки;
см/с2
-- закон изменения проекции ускорения материальной точки на ось с течением времени [1, с. 289];
(см/с2)
-- проекция ускорения материальной точки на ось в момент времени с;
(см/с2)
-- искомый модуль ускорения материальной точки.
Литература 1. Яворский Б. М., Селезнёв Ю. А. Справочное руководство по физике для поступающих в вузы и для самообразования. -- М.: Наука, 1989. -- 576 с.
Об авторе:
Facta loquuntur.
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alina.anischenko 
Гц -- частота колебаний материальной точки;
(рад/с) -- циклическая частота колебаний материальной точки [1, с. 287];
см -- амплитуда колебаний материальной точки;
рад -- начальная фаза колебаний материальной точки;
2,5 см -- смещение материальной точки от положения равновесия в некоторый момент времени.
см
с
момент времени, в который смещение материальной точки равно 
см;
см/с
с течением времени [1, с. 288];
(см/с)
см/с2
(см/с2)
(см/с2)