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Во сколько раз кинетическая энергия, которую необходимо сообщить телу для удаления его за пределы земного тяготения, больше кинетической энергии, необходимой для того, чтобы это тело вывести на круговую орбиту искусственного спутника земли, вращающегося на высоте 3000 км над ее поверхностью?
Обсуждение
Неизвестный
04.12.2009, 16:27
общий
это ответ
Здравствуйте, Лубошев Е.М.. Сила тяжести F= G*m1m3/r2 G — гравитационная постоянная = 6.67*10-11 Н*м2/кг2 радиус Земли 6 371 км Чтобы вычислить работу, которую необходимо совершить на перемещение тела на высоту 3000 км вычислим интеграл 6371∫9371Fdr= 6371∫9371[G*M*m/r2dr]= -GMm/r|6371∫9371= =5,025*10-5GMm
А теперь найдем работу для удаления за пределы 6371∫∝Fdr= 6371∫∝[G*M*m/r2dr]= -GMm/r|6371∫∝= =1,570*10-4GMm Находим их отношение = 1,570*10-4GMm/5,025*10-5GMm=3,12 раза
Неизвестный
04.12.2009, 17:11
общий
04.12.2009, 21:06
это ответ
Здравствуйте, Лубошев Е.М..
Потенциальная энергия тела в поле Земли: U=-mg*R02/(R0+h), где R0-радиус Земли 6400 км h - высота Т.е. для удаления тела за пределы земного тяготения, в соответствии с законом сохранения, ему необходимо сообщить кин энергию E1=-mg*R02/(R0+∞)-(-mg*R02/(R0+0))=mgR0
Для того, чтобы тело могло находиться на высоте h ему необходимо обладать,такой скоростью, чтобы выполнялось V2/(R0+h)=a=g*(R0/(R0+H))2 V2=g*R02/(R0+h)
Т. е. для обращения тела на высоте h оно должно обладать кинетичской энергией T=m*V2/2=m*g*R02/(2*(R0+h))
Тогда из закона сохранения энергии следует, что для вывода тела на орбиту высотой h ему необходимо сообщить кин. энергию E2=T-mg*R02/(R0+h)+mgR0=mgR0-0,5mg*R02/(R0+h)=0,5mgR0(2-R0/(R0+h))
E1/E2=2*(R0+h)/(R0+2h)=1,52
Это отношение в случае когда необходимо, чтобы тело осталось на круговой орбите.
В случае если нас интересует сам факт достижения такой высоты, то член кинетической энергии учитывать не надо и окончательное выражение примет вид E1/E2=2*(R0+h)/h=3.12, как и в предыдущем ответе.
Неизвестный
04.12.2009, 17:23
общий
Большое спасибо всем. Теперь все встало на свои места
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