Re: Annotated Einstein Clock


"Paul B. Andersen" <paul.b.andersen@xxxxxx> wrote in message news:1123501513.485237.322790@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> 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. :-)

All cyclists are masochists. If you don't belive me
I'll hurl my arm through your spokes. That'll teach ya! : o)

Sue...
>
> > 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

>


.

Relevant Pages

  • Re: Sun glare + gravel = crash
    ... Paul, you remind me of David, back when you use to Ride, you seem to ... Bjay continues to say to Paul: ... You seem to have trouble manevering and man handliing a bike at ...
    (rec.motorcycles)
  • Re: What does my bike tell you?
    ... none of the questions can be answered by the bike you ride!! ... You're right about that, Ravi. ... Paul, you like attention, don't you? ...
    (rec.bicycles.misc)
  • Re: What does my bike tell you?
    ... Paul wrote: ... How often do I ride? ... That is really a trick question.. ... Just by looking at the bike he rides, i do not come to any conclusions - just like you don't judge a book by its cover!! ...
    (rec.bicycles.misc)
  • Re: Wheelies..(henry2.p.jm)
    ... like the fucking idiot is just spewing more idiocy form his keyboard. ... and your friend should have his bike taken ... read or think, can't and doesn't ride, and hates everything, including ... My lord, .p.jm Paul has opinions, he use to ride. ...
    (rec.motorcycles)
  • Re: Is there bike snobbery?
    ... This involves a ten mile climb to about 900 feet. ... How would your bike cope? ... But Paul thinks it's impossible, ... first hill, ...
    (uk.rec.cycling)