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Science Forum Index » Astro Forum » STRING WALKS AND SILLY WALKS...
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| Pentcho Valev... |
 Posted: Fri Jul 18, 2008 2:04 pm |
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| Pentcho Valev... |
| Posted: Fri Jul 18, 2008 2:49 pm |
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Classical silly walks:
http://www.forbes.com/2008/02/28/brian-greene-time-oped-time08-cx_bg_0229physics.html
Brian Greene: "Einstein discovered that if you and I synchronize our
watches, and then you sit still while I run to and fro, when we rejoin
and compare our watches, we'll find that less time has passed on mine
than on yours. In short, motion through space slows the passage of
time....By 1915, with his "General Theory of Relativity," Einstein
took these realizations one step further, concluding that something
similar happens in a gravitational field. He figured out that the
stronger the gravity you experience, the slower time elapses. After
synchronizing our watches, were I to stay in the lobby of the Empire
State Building while you went sightseeing on the observation deck, I
would experience stronger gravity (being closer to Earth) and
according to Einstein, when we rejoin, my watch would be behind
yours."
http://hyperphysics.phy-astr.gsu.edu/Hbase/Relativ/bugrivet.html
http://www.math.ucr.edu/home/baez/physics/Relativity/SR/barn_pole.html
"These are the props. You own a barn, 40m long, with automatic doors
at either end, that can be opened and closed simultaneously by a
switch. You also have a pole, 80m long, which of course won't fit in
the barn....So, as the pole passes through the barn, there is an
instant when it is completely within the barn. At that instant, you
close both doors simultaneously, with your switch. Of course, you open
them again pretty quickly, but at least momentarily you had the
contracted pole shut up in your barn."
Pentcho Valev
pvalev at (no spam) yahoo.com |
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