The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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Pagina 22
... speed when all the 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 ...
... speed when all the 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 ...
Pagina 23
... speed with which the bricks are thrown off ? This idea may at first seem a little startling , but it must be remembered that as long as any propellant remains aboard , the trolley can go on accelerating , so there is no theoretical ...
... speed with which the bricks are thrown off ? This idea may at first seem a little startling , but it must be remembered that as long as any propellant remains aboard , the trolley can go on accelerating , so there is no theoretical ...
Pagina 33
... speed to maintain itself . It fell downwards , gaining speed as it did so , until it had picked up enough speed to climb upwards again and retrace its orbit . Its path is thus not a circle , but an ellipse . All these cases could be ...
... speed to maintain itself . It fell downwards , gaining speed as it did so , until it had picked up enough speed to climb upwards again and retrace its orbit . Its path is thus not a circle , but an ellipse . All these cases could be ...
Cuprins
THE SHAPING OF THE DREAM | 1 |
THE EARTH AND ITS NEIGHBOURS | 9 |
THE ROCKET | 17 |
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able acceleration actual already appear astronautics astronomers atmosphere atomic become body build carry certainly Chapter close completely consider considerable course deal developed difficult direction discovered discuss distance Earth effect energy escape exist exploration extremely fact fall field Figure fuel give given gravity greater heat human hundred idea imagine important impossible increase interesting interplanetary involved journey known landing least less light limit live look lunar Mars material matter means miles minutes Moon motors necessary never observed once orbit oxygen perhaps period planets Plate possible practical present pressure probably problem produce purely radio reach reason relatively remain rocket round satellite scientific seems seen ship shown simple Solar space spaceship speed stars stations structure surface telescope temperature thousand Universe velocity Venus weight whole