Re: Annotated Einstein Clock

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? :-)

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.

(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. :-)

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.

--
#191, ewill3@xxxxxxxxxxxxx
It's still legal to go .sigless.
.

Relevant Pages

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