The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 20
... vehicle is carrying a load of bricks ( Figure 5 ) . He takes one and throws it towards the right , producing a recoil as he does so . Since the mass of the bricks is only a small fraction of that of the trolley and its cargo , the ...
... vehicle is carrying a load of bricks ( Figure 5 ) . He takes one and throws it towards the right , producing a recoil as he does so . Since the mass of the bricks is only a small fraction of that of the trolley and its cargo , the ...
Pagina 21
... 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 during the act of throwing itself ...
... 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 during the act of throwing itself ...
Pagina 23
... vehicle's speed could indeed be doubled , but it would mean taking on a load of bricks equal to 6.4 times the final weight of the trolley - 1,280 pounds of bricks in all . Need we stop here ? In theory , no . As long as the final empty ...
... vehicle's speed could indeed be doubled , but it would mean taking on a load of bricks equal to 6.4 times the final weight of the trolley - 1,280 pounds of bricks in all . Need we stop here ? In theory , no . As long as the final empty ...
Cuprins
The Shaping of the Dream | 1 |
The Earth and Its Neighbours | 7 |
The Rocket | 17 |
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acceleration already asteroids astronautics astronomers atmosphere body bricks build carry certainly Chapter chemical completely course crew degrees F difficult direction distance Earth energy enormous escape velocity exploration extremely fact Figure free orbit fuel Galaxy giant gravitational field gravity heat Hermann Oberth hundred miles idea imagine important interplanetary flight interplanetary travel interstellar ionosphere journey Jupiter landing light light-years lunar Mare Imbrium Mars and Venus Martian means Mercury meteors million minutes missile Moon Moon's motors never observed oxygen payload perhaps planetary planets Pluto possible pounds pressure pressurised probably problem produce propellant propulsion Proxima Centauri R. A. Smith radar radiation radio reach reason refuelling return to Earth rocket power satellite Saturn scientific ship Solar System space space-flight space-station space-suits space-travel spaceship speed spinning stars stations surface take-off telescope temperature terrestrial thousand thrust tion trolley Uranus voyage weight