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"I prefer working by artificial light."
- Isaac Asimov
 |
| Gravity-assisted Subway | ||
| The fastest way between continents (that does not entail leaving the ground). |
This piece of technovelgy gives a great illustration of the fastest way to get from point A on the surface of the earth to another surface point B.
| The car shot forward and down. Corbell was on a roller coaster. He pulled out a chair arm and hung on. The car fell at a slant for what felt like half a minute. Then there was high gravity as car and tunnel curved back to horizontal. Light inside, darkness outside. Corbell was beginning to relax when the car rolled, surged to the left; rolled, surged to the right, steadied. What was that? Changing tunnels? His ears popped. Peerssa spoke. "Your speed is in excess of eight hundred kilometers per hour and still accelerating. A remarkable achievement. "How do they do it?" "At a guess, you are riding a gravity-assisted linear accelerator through an evacuated tunnel. You are about to pass beneath the Pacific Ocean..." |
| Technovelgy from A World Out of Time,
by Larry Niven. Published by Random House in 1976 Additional resources -
|
The ingenious solution is to dig a tunnel from one point to the other, using the force of gravity to provide some of the acceleration. The beauty of this approach is that, in a frictionless environment, you can speed the train on its way without having to apply any energy - and slow it down the same way!
The questions (for you engineers) are: what is the best shape (or curve) for the tunnel, and how can you avoid those pesky underground temperatures and pressures? See this article on the brachistochrone problem, one of the earliest problems posed in the calculus of variations. Newton solved this problem from scratch in one day in 1696; got your pencil? Ready, set ... go!
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More Ideas
and Technology from A World Out of Time
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Tech news articles related to A World Out of Time
Tech news articles related to works by Larry Niven
| Nifty Folding Electric Bicycles! |
| Boring Company Drills Asimov's Single Vehicle Tunnels |
| Boring Company Vegas Loop Like Asimov Said |
| SpaceX Rocket Shuttle Point-To-Point On Earth |
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'...a hemispherical force field enclosing his head.'
'Then he became aware of a gentle pressure pushing him away from the ship.'
'And now they wre busily transforming all their companions, and so on, and so on...'
'Why, a clockwork dancer, or, better still, one that would go by electricity and never run down...'
'Maybe the individual intelligence of each Cubic pools into a group intelligence...'
'Looks like she has bought the Avatar Construction Set and put together her own...'
'Across the ground something small and metallic came, flashing in the dull sunlight of midday.'
