The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 21
... bricks are hurled overboard the vehicle will steadily gain speed . It will be seen that it does not matter in the least what happens to the bricks after they have left the hand of the thrower : all the recoil or thrust is produced ...
... bricks are hurled overboard the vehicle will steadily gain speed . It will be seen that it does not matter in the least what happens to the bricks after they have left the hand of the thrower : all the recoil or thrust is produced ...
Pagina 22
... bricks have been used up . It should be fairly obvious that this final speed depends on two factors only : ( 1 ) the speed with which the bricks are thrown out , and ( 2 ) the quantity of bricks thrown out . Common sense , without any ...
... bricks have been used up . It should be fairly obvious that this final speed depends on two factors only : ( 1 ) the speed with which the bricks are thrown out , and ( 2 ) the quantity of bricks thrown out . Common sense , without any ...
Pagina 23
... bricks are ejected ? At first sight it might be thought that , since the empty weight of the vehicle is 200 pounds , the rider would have to throw off 200 pounds of bricks . This is not quite correct , for allowance must be made for the ...
... bricks are ejected ? At first sight it might be thought that , since the empty weight of the vehicle is 200 pounds , the rider would have to throw off 200 pounds of bricks . This is not quite correct , for allowance must be made for the ...
Cuprins
The Shaping of the Dream | 1 |
Navigation and Communication in Space | 78 |
1 | 118 |
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acceleration airless asteroids astronautics astronomers atmosphere body bricks build carry certainly Chapter chemical completely course crew diameter difficult distance Earth energy engineering enormous escape velocity exploration extremely fact Figure free orbit fuel Galaxy gases gravitational field gravity heat hundred hydrogen imagine important interplanetary flight interplanetary travel interstellar ionosphere journey Jupiter landing LEWIS CARROLL light light-years lunar Mars and Venus Martian means Mercury meteors miles million minutes missiles Moon Moon's motors never normal observed orbit oxygen payload perhaps planetary Plate Pluto possible pounds pressure probably problem produce propellant propulsion Proxima Centauri R. A. Smith radar radiation radio reach reason refueling rocket power satellite Saturn scientific ship Solar System space space-flight space-stations space-suits space-travel spaceship speed spinning stars stations structure sunlight surface take-off tanks telescope temperature thousand thrust trolley Uranus vehicle voyage weight weightless