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Дано: км, км -- высоты, с которых тело падает на поверхность Земли. Определить: -- время, за которое тело упадёт на поверхность Земли с высоты -- отношение времени падения тела на поверхность Земли с высоты к времени падения тела на поверхность Земли с высоты
Первая часть Вашего вопроса является одним из предметов рассмотрения задачи, условие и решение которой в общем виде, согласно [1], показаны в прикреплённых файлах. После подстановки в формулу из приведенного решения задачи числовых значений величин км, м/с2, получим
(с).
Как я понимаю, понятие бесконечной высоты лишено физического смысла, поскольку высота над поверхностью Земли не может превышать радиуса Вселенной, относительно которого точных данных нет. Кроме того, поставленная задача может быть решена только с привлечением теории относительности ввиду релятивистского эффекта возрастания массы тела. Поэтому на вторую часть Вашего вопроса я не отвечу.
Ответ: с. Литература 1. Теоретическая механика. Динамика. Практикум. В 2 ч. Ч. 1. / В. А. Акимов [и др.]. -- Минск: Новое знание; М.: ЦУПЛ. -- 2010.
Считаем Землю абсолютно неподвижной. Поскольку высота составляет треть радиуса Земли, а во второй части спрашивается о еще больших значениях, то рассчитываем силу взаимодействия по закону Ньютона. Тогда
m*dv/dt = - [$947$]*m*M/r2, где - M - масса Земли; r - расстояние от тела до центра Земли; [$947$] - постоянная всемирного тяготения.
или dv/dt = - [$947$]*M/r2
r=R+h, где R - радиус Земли; h - текущая высота над Землей
Делаем замену переменных (r на h).
d2h/dt2 = - [$947$]*M/(R+h)2
Умножим обе стороны уравнения на dh/dt и получим:
dh/dt*d2h/dt2 = - [$947$]*M/(R+h)2*dh/dt
d( (dh/dt)2/2)/dt = [$947$]*M*d( 1/(R+h) )/dt
Откуда, интегрируя, получаем: (dh/dt)2 = 2*[$947$]*M/(R+h) + C, где C - константа, которая определяется из условия при t=0, h=H, v=0.
Осталось проинтегрировать это уравнение. Вручную я бы, вряд ли, это сделал, но с помощью программ интегрирования в Интернете получаем готовое выражение (не буду его здесь приводить, лишь обозначим его как F(h)). В этом и есть сложность этой задачи: интегрирование.
Получаем выражение вида t = F(h) + C1, где C1 - константа, которую находим из условия при t=0 h=H, т.е.
0=F(H)+C1, откуда C1=-F(H).
Значит, искомое T= F(0) - F(H), т.е. падение до нулевой высоты.
Что касается, бесконечной высоты, то нужно просто найди предел найденного выражения для T при H стремящемся к бесконечности. Скорее всего, при вычислении этого предела придется воспользоваться правилом Лопиталя.
ПРИМЕЧАНИЕ. Разумеется, бесконечная высота - это абстракция этой задачи, но высота 2000 км - это тоже абстракция - на этой высоте уже придется учитывать влияние других планет, например, Солнца, чего мы не делали, да и неподвижной Земли не бывает, а значит, тело будет не падать на Землю, а "догонять" Землю. В этом случае уравнения совершенно другие. В общем, вся эта задача - сплошное упрощение реальной ситуации и одновременно ее усложнение (в первую очередь, появление очень непростых интегралов).
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