🚀 go-pugleaf

"Pentcho Valev" <pvalev@yahoo.com> wrote in message 
news:77495121-f5dc-4968-a75a-bf0940a24863@f3g2000hsg.googlegroups.com...
: On Dec 20, 11:11, Pentcho Valev <pva...@yahoo.com> wrote:
: > In discussing the Sagnac effect, both relativists and anti-relativists
: > make the following mistake:
: >
: > http://www.mathpages.com/rr/s2-07/2-07.htm
: > "Quantitatively, if we let w denote the angular speed of the loop,
: > then the circumferential tangent speed of the end point is v = wR, and
: > the sum of the speeds of the wave front and the receiver at the "end"
: > point is c-v in the co-rotating direction and c+v in the counter-
: > rotating direction.....This analysis is perfectly valid in both the
: > classical and the relativistic contexts."
: >
: > The values c-v and c+v above are "perfectly valid" only in the
: > relativistic context. If by "classical" the author means "Newtonian",
: > the analysis is by no means "perfectly valid". According to an
: > observer at rest, in the classical context, the speed of light is c+v
: > in the co-rotating direction and c-v in the counter-rotating direction
: > so the correct text would be:
: >
: > "Quantitatively, if we let w denote the angular speed of the loop,
: > then the circumferential tangent speed of the end point is v = wR, and
: > the sum of the speeds of the wave front and the receiver at the "end"
: > point is c in the co-rotating direction and c in the counter-rotating
: > direction."
:
: http://www.mathpages.com/rr/s2-07/2-07.htm
: "It's also worth noting that there is no Doppler shift involved in a
: Sagnac device..."

Obviously bullshit.