Posts by Snark Boojum

Ofcom will not probe lesbian lizard snog in new Dr Who series

Not racist

Might be casual speciesism, he's not human !!

VTOL hybrid flying car promises the skies

Re: Who'd have thought the robin reliant...

That's Reliant Robin - you wouldn't say Escort Ford would you ?

Ohio prof develops CCTV people-tracker 'ware

Dodgy geezers

I trust that the automatic police weapons system will just shoot anyone in charge of a loud shirt or looking at the camera in a funny way. oh Lord what are we getting ourselves into ?

Today is not Hadron Collider Day

Relativistic Velocity Addition

In answer to Gianni Straniero - what is the closing speed of the 2 beams approaching each other where each is near the speed of light .. We cannot use the standard Euclidian v = v1 + v2 addition because of special relativity theory so we use the relativistic velocity addition where c is the speed of light. This is asymptotic on c as v1 and v2 increase. At low velocities it gives a result close to the Euclidian formula

v = (v1 + v2) / (1+(v1/c)(v2/c))

Wikipedia entry on the subject :-

http://en.wikipedia.org/wiki/Velocity-addition_formula

Mine's the lab coat