Text 28667, 81 rader
Skriven 2007-05-06 23:30:29 av Mimi Gallandt (1:123/789.0)
  Kommentar till text 28659 av John Hull (1:123/789.0)
Ärende: Muslems
===============
John Hull -> Mimi Gallandt wrote:
 JH> Mimi Gallandt -> John Hull wrote:
 MG>> John Hull -> Mimi Gallandt wrote:
 JH>>> Mimi Gallandt -> VERN HUMPHREY wrote:
 MG>>>> VERN HUMPHREY -> MIMI GALLANDT wrote:
 VH>>>>>>> John, imagine we're going to the newly-discovered planet some 10
 VH>>>>> light
 VH>>>>>>> years away. At an acceleration rate of 1G, how long would it
 VH>>>>> take us to
 VH>>>>>>> get there?

 MG>>>>>> Far, far longer than the average human life cycle. :(

 VH>>>>> It would take over 58 years to reach light speed (if we could)
 MG>>>> and just
 VH>>>>> as long to decelerate from that speed so we could land.  A child
 MG>>>> born
 VH>>>>> just after takeoff would be 117 years old when he reached his
 VH>>>>> destination -- assuming there was no period of travel at light
 MG>> speed
 VH>>>>> between acceleration and decelerations

 MG>>>> Which is longer than the average expected human life. Unless of
 MG>> course
 MG>>>> Einstein had that relativity thing correct of course. (Keeping
 MG>> in mind
 MG>>>> that I'm not a scientist)didn't his theory suppose that time
 MG>> passes at
 MG>>>> a different rate the farther away from something (let's say
 MG>> Earth) one
 MG>>>> gets? (or have I, as usual, got that whole thing fubar?)

 JH>>> You are talking about time dilation, and it has been proven.  If you
 JH>>> have two clocks, one at Cape Canaveral and one aboard a spaceship
 MG>> that
 JH>>> are sychronized, they will both read the same elapsed time at the
 MG>> start.
 JH>>>  When the spaceship takes off and accelerates, the two clocks
 MG>> begin to
 JH>>> show different times.  For travelers on the spaceship, time
 MG>> appears to
 JH>>> be normal relative to their point of reference because the clock is
 JH>>> traveling at the same speed they are.  But time is really slowing
 MG>> down
 JH>>> for them relative to the clock at Cape Canaveral.  A voyage that
 MG>> takes
 JH>>> 100 years out and back, at near light speed for the ship on its
 MG>> clock,
 JH>>> takes several thousand years if you go by the clock on earth.  Every
 JH>>> human on earth would have lived and died several times over
 MG>> before the
 JH>>> ship returned.

 MG>> Wow, sounds like I was really close. :)  Isn't that the theory of
 MG>> Relativity? (damned black hole memory <g>)

 JH> Very basically.  There's a whole lot more to it, though, when you start
 JH> digging into it.

Thanks, really getting into physics confuses me and gives me a headache. :( 
You have to remember that when I was in school teachers didn't really worry
about teaching science to girls because they thought it was beyond that. I
believe their attitude in my case caused a self fulfilling prophecy. :(

-- 
L'Chaim

Mimi

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—Hugh G. Gallagher, 1998

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