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Консультация № 191539
25.10.2017, 18:22
0.00 руб.
0
15
1
Здравствуйте! Прошу помощи в следующих вопросах:
1) В момент t=0 точка начинает двигаться из начала координат по оси z со скоростью V=c(b-z)^(1/2) .
Через какое время точка остановится?
2) На два одинаковых неподвижных шара налетает такой же третий. Его центр движется перпендикулярно отрезку, соединяющему центры неподвижных шаров. После упругого удара скорость налетающего шара уменьшается в 2 раза, а первоначально неподвижные шары разлетаются симметрично. Найти угол между направлениями разлета этих шаров.
3) Цилиндр и тонкостенная труба вкатываются без скольжения вверх по наклонной плоскости с одинаковой начальной скоростью. Найти отношение высот их объема.
1) В момент t=0 точка начинает двигаться из начала координат по оси z со скоростью V=c(b-z)^(1/2) .
Через какое время точка остановится?
2) На два одинаковых неподвижных шара налетает такой же третий. Его центр движется перпендикулярно отрезку, соединяющему центры неподвижных шаров. После упругого удара скорость налетающего шара уменьшается в 2 раза, а первоначально неподвижные шары разлетаются симметрично. Найти угол между направлениями разлета этих шаров.
3) Цилиндр и тонкостенная труба вкатываются без скольжения вверх по наклонной плоскости с одинаковой начальной скоростью. Найти отношение высот их объема.
Обсуждение
27.10.2017, 10:31
общий
это ответ
Здравствуйте, goldssky@yandex.ru!
1) Точка остановится при
то есть при 
Тогда
точка остановится через время
1) Точка остановится при
то есть при Тогдаточка остановится через время
Об авторе:
Facta loquuntur.
Facta loquuntur.
29.10.2017, 19:02
общий
Адресаты:
goldssky@yandex.ru После интегрирования -не потерян ли минус?
Где?
Об авторе:
Facta loquuntur.
Facta loquuntur.
29.10.2017, 19:20
общий
Адресаты:
Не нужно гадать. Проинтегрируйте. Время не должно быть отрицательной величиной.
Об авторе:
Facta loquuntur.
Facta loquuntur.
29.10.2017, 19:44
общий
Время не должно быть отрицательной величиной. Но мы же не знаем чему равно С.
29.10.2017, 19:54
общий
Адресаты:
Если 
то точка не остановится после начала движения, как я понимаю.
то точка не остановится после начала движения, как я понимаю.
Об авторе:
Facta loquuntur.
Facta loquuntur.
29.10.2017, 20:22
общий
29.10.2017, 20:22
Ну может я неправа:
--(2корень из b)/ c=t
при с меньше нуля точка остановится, если b будет равно z
--(2корень из b)/ c=t
при с меньше нуля точка остановится, если b будет равно z
29.10.2017, 20:31
общий
Почему? Квадратный корень из числа м.б. отрицательным. тогда минус на минус -плюс.
29.10.2017, 20:34
общий
Адресаты:
Всё может быть. Я исходил из принятого в математике определения квадратного корня.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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