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Консультация № 190390
09.01.2017, 10:48
0.00 руб.
0
1
1
Здравствуйте! Прошу помощи у экспертов в следующем вопросе:
1.Вагон массой m = 80 т имеет рессоры жесткостью k по 500 кН/м
каждая. Определить длину рельса, если известно, что при скорости движе-
ния вагона V = 36 км/ч он начинает сильно раскачиваться.
2.На вращающийся диск массой М = 2 кг и радиуса R1 = 1 м бро-
сают без вращения обруч массой m = 1 кг радиуса R2 = 0,5 м. На сколько
изменится угловая скорость вращения системы, если после падения обруча
на диск его центр будет находиться на расстоянии l = 0,25 м от оси враще-
ния диска? Начальная скорость вращения диска ω1 = 2 c–1.
3.Определить момент сил M, действующих на пулю калибра
d = 7,62 мм и массой m = 10 г в стволе винтовки длиной l = 0,6 м, если изве-
стно: 1) пуля представляет собой однородный цилиндр; 2) при вылете из
ствола пуля успевает сделать N = 4 полных оборота и имеет скорость v = 600 м/с;
3) пуля в стволе движется равноускоренно
1.Вагон массой m = 80 т имеет рессоры жесткостью k по 500 кН/м
каждая. Определить длину рельса, если известно, что при скорости движе-
ния вагона V = 36 км/ч он начинает сильно раскачиваться.
2.На вращающийся диск массой М = 2 кг и радиуса R1 = 1 м бро-
сают без вращения обруч массой m = 1 кг радиуса R2 = 0,5 м. На сколько
изменится угловая скорость вращения системы, если после падения обруча
на диск его центр будет находиться на расстоянии l = 0,25 м от оси враще-
ния диска? Начальная скорость вращения диска ω1 = 2 c–1.
3.Определить момент сил M, действующих на пулю калибра
d = 7,62 мм и массой m = 10 г в стволе винтовки длиной l = 0,6 м, если изве-
стно: 1) пуля представляет собой однородный цилиндр; 2) при вылете из
ствола пуля успевает сделать N = 4 полных оборота и имеет скорость v = 600 м/с;
3) пуля в стволе движется равноускоренно
Обсуждение
10.01.2017, 09:19
общий
это ответ
Здравствуйте, Друид!
Рассмотрим первую задачу.
Пусть вагон имеет
рессоры. При скорости движения 
км/ч
м/с вагон начинает сильно раскачиваться. Будем считать, что при этой скорости возникают вынужденные колебания вагона, частота 
которых близка к частоте 
его собственных колебаний. Приняв, что 
и обозначив 
- длина рельса, получим
(м).
Рассмотрим первую задачу.
Пусть вагон имеет
рессоры. При скорости движения км/ч м/с вагон начинает сильно раскачиваться. Будем считать, что при этой скорости возникают вынужденные колебания вагона, частота которых близка к частоте его собственных колебаний. Приняв, что и обозначив - длина рельса, получим (м).
5
спасибо<br><br><br>
Об авторе:
Facta loquuntur.
Facta loquuntur.
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