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wu :: forums    riddles    general problem-solving / chatting / whatever (Moderators: william wu, Eigenray, ThudnBlunder, towr, SMQ, Grimbal, Icarus)    super fast trains « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: super fast trains  (Read 393 times) amichail Senior Riddler     Posts: 450 super fast trains   « on: Aug 30th, 2006, 5:40am » Quote Modify How would you build a train system that would allow you to travel to any major city in 42 minutes? IP Logged DropZap - a new kind of block elimination game Grimbal wu::riddles Moderator Uberpuzzler     Gender: Posts: 7527 Re: super fast trains   « Reply #1 on: Aug 30th, 2006, 5:48am » Quote Modify I would do it Amazingly.   Hm... I think We'd have to redefine "major city" to include only Mexico.  Or maybe redefine the length of the minute. IP Logged amichail Senior Riddler     Posts: 450 Re: super fast trains   « Reply #2 on: Aug 30th, 2006, 5:53am » Quote Modify The problem is this: given any two points on earth, how would you travel from one point to another by train in 42 minutes?   The fact that the trip always takes 42 minutes no matter where you start and end up is a big clue here. IP Logged DropZap - a new kind of block elimination game towr wu::riddles Moderator Uberpuzzler Some people are average, some are just mean.     Gender: Posts: 13730 Re: super fast trains   « Reply #3 on: Aug 30th, 2006, 8:12am » Quote Modify You overcome friction. On the plus side, running costs could be entirely free. But then there's other concerns, like your train melting halfway through.. IP Logged Wikipedia, Google, Mathworld, Integer sequence DB Miles Junior Member Cambridge, England     Gender: Posts: 95 Re: super fast trains   « Reply #4 on: Aug 30th, 2006, 8:43am » Quote Modify It also has the virtue of using the least amount of track between two points.   Will the rotation of the earth cause some problems?  (Imagine the journey between two points on the Equator, 90deg W and 90deg E). IP Logged Icarus wu::riddles Moderator Uberpuzzler Boldly going where even angels fear to tread.     Gender: Posts: 4863 Re: super fast trains   « Reply #5 on: Aug 30th, 2006, 6:24pm » Quote Modify Only in that you will need your frictionless rails on the sides of the tunnels as well as the bottom. IP Logged "Pi goes on and on and on ... And e is just as cursed. I wonder: Which is larger When their digits are reversed? " - Anonymous Miles Junior Member Cambridge, England     Gender: Posts: 95 Re: super fast trains   « Reply #6 on: Aug 31st, 2006, 1:54am » Quote Modify Funnily enough, the news here (UK) is talking about very fast mag-lev trains (London to Edinburgh in 2 hours).  You could position the magnets all round the tunnel walls, pump the air out and drop a capsule full of (brave) passengers into the hole / tunnel. IP Logged Pages: 1  Reply Notify of replies Send Topic Print Forum Jump: ----------------------------- riddles -----------------------------  - easy   - medium   - hard   - what am i   - what happened   - microsoft   - cs   - putnam exam (pure math)   - suggestions, help, and FAQ => general problem-solving / chatting / whatever ----------------------------- general -----------------------------  - guestbook   - truth   - complex analysis   - wanted   - psychology   - chinese « Previous topic | Next topic »

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