38 posts • joined Monday 2nd July 2007 12:59 GMT
Mach number is a measure of speed related to the speed of sound.
As this test was conducted in Helium, the speed of sound is higher and thus Mach 1 = 972 m/s compared with 331 m/s for air (both at 0 deg C)
So, was the actual speed Mach 9 Helium (31432 km/h) or Mach 9 Air (10724 km/h)? Given that they think it was only "probably" not a good idea to run a rocket sled through a hydrogen tunnel I think we know the answer...
Re: Lucky they weren't in the UK
He was lucky to *only* get arrested. At least they didn't chase him onto a tube train then stand on him and blow his brains out.
Time to find another country to live methinks...
Punters left out
Over here we are a accustmed to being with a network, and getting upgrades when the contract runs out.
This isn't happening with the iFone, thanks to the O2 numpties believing the Apple hype and agreeing to their stupid marketing plan.
For Lewis Page Fanboys...
Alan Coren Lives on!
At least Mr Page seems to have been taken over by his spirit.
Absolutely brilliant writing mate !
Eh.. 98% of a MW?
"Modern transmitters can be incredibly efficient, with efficiencies exceeding 98 per cent. However, a broadcast transmitter with a megawatt power stage transferring 98 per cent of that into the antenna can also be viewed as a 20 kilowatt electric heater."
98% of a megawatt is 980 kw where I come from. 20kW is the heat lost in the amplifier, not radiated.
Metric system invented by...
yes, us Brits !
From the Wiki:-
"The metric system, and metre was first fully described by Englishman John Wilkins in 1668 in a treatise presented to the Royal Society some 120 years before the French adopted the system"
Someone said "What's most likely is that intelligent people, including the best teachers, who could get work elsewhere legged it when the rain started glowing in the dark. This selective migration would lower the average intelligence and teacher quality having a compound effect on academic outcomes."
I think you'll find that teachers moving away has a benificial effect on average intelligence... :P
Future not too bright
So on the heels of yesterdays story of the Orange MarketingTwatDepartment associating their company with smoking, now they do this brainless thing.
Obviously not a cool outfit to be associated with.
What a tosser..
"Analysts have been warning Apple for years that the iPod risked going the way of the starting handle after the invention of automatic ignition."
So when exactly was "Automatic Ignition" invented? I can't say I've ever heard of it..
So the flood plains are getting flooded are they?
Well consider how they became flood plains, and then figure out if this occurred in the last century, or the last millenia.
Global warming - well yes of course. It's a natural phenomenon.
Caused by us? I don't think so..
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