Re: Annotated Einstein Clock


The Ghost In The Machine skrev:
> In sci.physics.relativity, Paul B. Andersen
> <paul.b.andersen@xxxxxx>
> wrote
> on 7 Aug 2005 13:30:31 -0700
> <1123446631.198172.114300@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>:
> >
> > The Ghost In The Machine skrev:
> >> In sci.physics.relativity, Paul B. Andersen
> >> <paul.b.andersen@xxxxxx>
> >> wrote
> >> on 6 Aug 2005 12:50:58 -0700
> >> <1123357858.889675.79020@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>:
> >> >
> >> > Sue... skrev:
> >> >> Sue... wrote:
> >> >> Hint:
> >> >> If you take three links out of a bicycle chain
> >> >> does it increase or decrese the road speed ?
> >> >>
> >> >> Sue...
> >> >
> >> > With missing links in the chain, the road speed
> >> > will decrease uphill and increase downhill.
> >> >
> >> > Have we falsified relativity now, Sue?
> >> >
> >> > Paul
> >> >
> >>
> >> Erm, how does the *road* have speed anyway? :-)
> >
> > It sure has.
> > Look down when you are cycling, and you will see it.
> > And if you fall off, you will even feel it.
> > I know, because I have tried.
>
> Hmm...well, OK, I guess it does depend on one's coordinate
> system. *wince*
>
> >
> >> In any event, any bicyclist knows that taking links out
> >> of the chain will either cause a malfunction (if one has
> >> a single-rear-gear affair or takes out too many links) or
> >> adjust the derailleur (a spring-mounted affair on the rear
> >> wheel, near the sprocket gears). It will not change the
> >> gear ratio -- the true determiner, along with pedal crank
> >> length, wheel diameter, air resistance, and health and
> >> weight of the rider, of the travel speed of the vehicle.
> >
> > Of course.
> > I considered this too obvious to deserve a serious answer.
> > So my answer was based on the fact that if there are
> > missing links in the chain, then it is broken. :-)
>
> What, me pedantic? :-)
>
> >
> >> (Weight, as the weight helps to push down on the pedals.
> >> There's admittedly a few issues here, though.)
> >>
> >> Also, a vehicle moving 30 m/s (67.1 mph) will have a
> >> relativistic correction factor of about 5 * 10^-15
> >> (this would be rather fast for a bicycle, admittedly).
> >> The bicyclist crossing the United States (5000 km from
> >> SF to Boston) might notice a shrinkage of 1/20th of the
> >> wavelength of a visible light photon, and a reduction in
> >> his travel time of about 5/6th of a nanosecond -- assuming
> >> he doesn't get stuck in traffic or his mount gets a flat.
> >>
> >> For the sake of comparison, the Tour de France is 3607 km.
> >> Vive la America, and Lance Armstrong's 7th consecutive
> >> and final victory. :-)
> >
> > Quite.
> > Lance Armstrong is a terrific guy.
> > One of the two greatest cyclists in the history of cycling.
> > (The other one is obviously Eddy Merx.)
>
> FSVO "obvious", admittedly. I've not kept up with the sport myself. ;-)

http://en.wikipedia.org/wiki/Eddy_merx

> >
> > BTW, Thor Hushovd, the winner of the green jersey in le Tour
> > is from my home town, Grimstad.
> > http://ca.sports.yahoo.com/sc/news?slug=reu-tourhushovdfactbox&prov=reuters&type=lgns
> > http://www.thor-hushovd.com/
> >
> > I have known him since he was a kid,
> > even raced together with him in our local cycle club.
> > (Not in the same age class, though. He was a kid, and
> > I was - well - older.)
> > http://www.grimstadsk.no/
> >
> > A bit off topic.
> > Sorry.
> >
> >> http://studenttravel.about.com/od/tourdefrance2005/a/tourroutemap05.htm
> >> http://studenttravel.about.com/od/tourdefrance2005/a/tourroutemap05_2.htm
> >>
> >> Apparently I picked the wrong two cities; there's several webpages
> >> suggesting the Race Across America (RAAM), from San Diego to
> >> Atlantic City, New Jersey. This is slightly less: 4620 km,
> >> give or take.
> >
> > But still pretty long.
> > The longest race I have participated in was a mere 560 km. :-)
> > (Trondheim - Oslo)
>
> Impressive.

Not very special, though.
Several thousands ride it every year.
Norwegians are known to be masochists. :-)

> I can ride maybe 12 miles or so, if that. Of course
> I don't have an ultralightweight 25-speed bicycle, either. :-)
> It's a very old 10-speed.

My bike was state of the art 20 years ago.
It is now collecting dust in the garage.
But the engine is the most important part of the bike.
I am afraid it's the most rusty part.

Paul

.

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