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de Havilland Comet Srs. 1-4 by Philip Birtles

By Philip Birtles

;de Havilland Comet Srs. 1-4 [Aircraft Profile 108] КНИГИ ;ВОЕННАЯ ИСТОРИЯ Название:de Havilland Comet Srs. 1-4 Автор: P.J.Birtles Серия: airplane Profile 108 Издательство: Profile courses Ltd Год издания: 1966 Страниц:16 Формат: PDF в rarЯзык: английский Размер: 11.59 Мб Для сайта: Мир книгde Havilland DH.106 Comet был одним из первых в мире реактивным пассажирским самолётом. Он первым разрабатывался именно в качестве пассажирской реактивной машины, и стал первым, начав коммерческие полёты, опередив ближайших конкурентов более чем на четыре года. На базе самолета создан морской разведывательный самолет Nimrod, до сих пор стоящий на вооруженииifolder.ru.com zero

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He was not able to clarify his concepts, however. This was done, at least partially, by Newton. ) Although all the possibilities of a purely phenomenological 40 MECHANICS OF THE SOLAR SYSTEM approach are not completely exhausted, we shall also abandon the kinematical approach and t u r n to dynamics. Our aim is to gain a deeper insight. This can only be done a t t h e cost of introducing hypotheses. The determination and calculation of an orbit is essentially a kinematical problem, and, therefore, its validity does not depend on t h a t of the basic dynamical hypotheses.

6. I n conclusion we may say a few words about the constant of gravitation, and also about the masses of the Sun and planets. By the general law of gravitation the planets must attract each other. Obviously, however, the gravitation of the Sun so strongly outweighs t h a t of the planets that, to the degree of observational accuracy which we are at present accepting, the interactions of the planets are still negligibly small. Because their distances from each other, at least at times, are not greater t h a n their distances from the Sun, the smallness of the interplanetary forces must arise from the small masses of the planets (relative to the Sun) rather t h a n from their great distances.

This can only be done a t t h e cost of introducing hypotheses. The determination and calculation of an orbit is essentially a kinematical problem, and, therefore, its validity does not depend on t h a t of the basic dynamical hypotheses. Exercises 1. Assuming that the Earth and a planet move around the Sun in the same plane, and with uniform circular motion, construct diagrams showing the direction of the planet, as seen from the Earth, as a function of the time, (a) for an inner planet (a < 1), (b) for an outer planet (a > 1).

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