The Exploration of SpaceTemple Press, 1951 - 198 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 brick 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 brick 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 | 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