Vapin' Joe
Formerly known as Smokin Joe
- Location
- Bare headed cyclist, Smoker
Calling @swansonj ....
- Thread starter Fab Foodie
- Start date
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Research has recently pointed to the theory that the speed of light is not actually a constant. Data collected by watching deep space gamma bursts suggest that higher energy photons actually travel slower than low energy photons because they interact more with the ripples in space-time. The size of the speed difference; one light second in a billion light years. That's some interesting maths.Ever wished you'd never opened a thread?
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OP
OP
Fab Foodie
hanging-on in quiet desperation ...
- Location
- Kirton, Devon.
..... Or started one. It seemed such a simple question ....Ever wished you'd never opened a thread?
How long have you been on this forum?
OP
OP
Fab Foodie
hanging-on in quiet desperation ...
- Location
- Kirton, Devon.
Fair point, I took leave of my senses for a moment....
Vapin' Joe
Formerly known as Smokin Joe
- Location
- Bare headed cyclist, Smoker
You took the words right out of my mouth
subaqua
What’s the point
- Location
- Leytonstone
I have been to Portland ,Dorset. The above statement at the end has signs of proof there !
srw
It's a bit more complicated than that...
Now you know how I feel when I read stuff about football.Ever wished you'd never opened a thread?
U
User482
Guest
Yes.
Second tallest in the UK (as @subaqua says, the Dartford crossing is the tallest). The cables are basically a parabola (exactly so if you ignore self weight, if you want the exact solution it's a catenary*, but the parabola is a good enough approximation). y=x squared. So as you increase x, the span, y, the height, goes up much worse than linearly. Hence long spans end up with ridiculously tall towers. (Exception: valley crossings where the ends are on the raised land at the sides of the valley. Our line out to Dinorwic and Wylfa crosses the Aber Valley with one of our longer spans but it doesn't look so spectacular because the pylons are quite normal. ) Plus the clearance at the low point in the middle usually has to be higher for ships than the standard clearance for on-land which is based round combine harvesters.
That is our original 275kV line to Wales. When the time came to expand to a 400 kV crossing as well, we did that with a tunnel instead. They actually cross over each other in the no-mans-land of the Bristol Channel. We also tunneled under the Solent at Fawley and the Medway to avoid using these massive pylons, and there are tunnels under the Thames as well as the overhead line at Dartford.
Boy, those drinks at the drinks reception taste good
* I did catenaries from first principles in maths at school. 15 years later, having crossed a rope suspension bridge in Nepal, I lay awake in my sleeping bag that night trying to rederive the equations. And failed dismally. Now, another 15 years on, not only could I not derive them, I can't even remember what they look like...
See, that's the difference between you and me: I have also crossed a (particularly rickety) rope suspension bridge in Nepal. My thoughts were limited to i) Am I going to die right now? and ii) thank god that's over - where's the beer?
User's thread about a simultaneous equation got me thinking about maths: I distinctly remember doing a Laplace transform in one of my Finals papers (which I passed), but having just googled it, I don't even understand the explanation. I seem to have left an important part of my brain somewhere in a field in Hampshire.
Dayvo
just passin' through
- Location
- 59° 50′ 5.55″ N, 10° 47′ 41.89″ E
Interestingly, I read (I say read, I understood the words but not their meaning
) on the BBC website that the universe might be a 'simulation' as portrayed in the Matrix films. Hmmm...http://www.bbc.com/earth/story/20160901-we-might-live-in-a-computer-program-but-it-may-not-matter
Dayvo
just passin' through
- Location
- 59° 50′ 5.55″ N, 10° 47′ 41.89″ E
... and the wonderful metaphor, or, indeed, feeling of being over the moon.
U
User482
Guest
Sorry, I thought you were getting all ecclesiastical. Next week's lesson covers the trajectory of the thurible, and the shedding of incense vortices.
