Why does every dork and his dog continue to call it contraction?
in [Relativity]
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From: Androcles on 21 Jun 2010 07:34 "colp" <colp(a)solder.ath.cx> wrote in message news:61dff2bc-2261-4b00-bd44-02bbfc212db6(a)y6g2000pra.googlegroups.com... On Jun 21, 4:00 pm, stevendaryl3...(a)yahoo.com (Daryl McCullough) wrote: > colp says... > > > > >On Jun 20, 5:57=A0pm, Uncle Ben <b...(a)greenba.com> wrote: > >> colp, you complain that SR implies a contradiction: each twin is > >> younger than the other, which is absurd. No one has yet explained to > >> you why, in SR, it is not absurd. > > >They haven't explained the symmetric twin paradox because it is > >actually absurd to thing that two contradictory predictions are both > >true. > > SR only makes one prediction: in the symmetric case, the twins > are the same age when they reunite. That smacks of political reasoning: Start with your conclusion (in this case that there is no paradox) and make your argument fit the facts of the day as necessary. According to you, SR says: 1. Light travels at constant velocity, at speed c, in all directions, independent of the motion of the source. 2. An ideal clock traveling at speed v for time period t will show an elapsed time of T = t square-root(1-(v/c)^2). 3. An extended object traveling at speed v will, after reaching its equilibrium shape, be contracted in the direction of motion by a factor of square-root(1-(v/c)^2). ============================================ According to Einstein tau = t.square-root(1-(v/c)^2) = less seconds for the moving clock. (multiplication) xi = (x-vt) / sqrt(1-(v/c)^2) = greater length for the moving rod. (division) "the clock moved from A to B lags behind the other which has remained at B." moving clocks run slow. moving rods get LONGER. 3. An extended object traveling at speed v will, after reaching its equilibrium shape, be EXPANDED in the direction of motion by a factor of square-root(1-(v/c)^2). Why does every dork and his dog continue to call it contraction? ============================================= 4. An object not under the influence of any forces will move at constant speed. Those are all true in any inertial coordinate system. ============================================= Inertial systems are Newtonian. You can't mix Newtonian Mechanics with Stupid Relativity. A team of scientists working under the direction of researchers from the University of Sussex have recently discovered that Einstein did not say "inertial". http://www.androcles01.pwp.blueyonder.co.uk/inertial.JPG Nor did he mean inertial: "If we assume that the result proved for a polygonal line is also valid for a continuously curved line, we arrive at this result: If one of two synchronous clocks at A is moved in a closed curve with constant velocity until it returns to A, the journey lasting t seconds, then by the clock which has remained at rest the travelled clock on its arrival at A will be 1/2 tv^2/c^2 second slow." |