The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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Pagina 21
... bricks are used up , so the weight of the vehicle steadily decreases . It follows , therefore , that the last bricks will produce a much greater effect than the first ones . If the " empty " weight of the trolley is half that of its ...
... bricks are used up , so the weight of the vehicle steadily decreases . It follows , therefore , that the last bricks will produce a much greater effect than the first ones . If the " empty " weight of the trolley is half that of its ...
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 themselves . Calculation shows that the 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 ...
... bricks themselves . Calculation shows that the 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 ...
Cuprins
Automatic Rocket Surveying Mars | 3 |
The Earth and its Neighbours | 9 |
The Rocket | 17 |
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acceleration already astronautics astronomers atmosphere body bricks British Astronomical Association 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 involved ionosphere journey Jupiter landing light light-years lunar 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 trolley Uranus voyage weight