1655 posts • joined Wednesday 24th March 2010 19:26 GMT
Well I am really a chemist (retired) but I've spent a lot of my time writing scientific software, protein modelling and utilising quantum mechanics. All these things have required rather a good knowledge of physics..
Your evidence ?? and indeed provenance as you only joined today so we've not had the benefit of your wisdom before.
Re: But Why?
"You might as well ask why energy increases with the square of velocity in classical mechanics?"
It doesn't - the classical equation for kinetic energy is 0.5mv^2
The equation for relativistic kinetic energy is :-
Re: It's my understanding.....@Chemist
I don't think anyone can give you a 'simple' explanation for this. Many topics are rather inaccessible to analogy - the theory and the mathematics give certain predictions and measurements agree.
It's not the only theory to be 'difficult' - the predictions of quantum physics are equally difficult to rationalize.
Re: FTL - easy-peasy...
"is perfectly possible "
Well potentially possible as you need to go moderately close to c, say 0.95c, but where is the energy to get there coming from ? An (unrealistically ) modest 1000 tonnes ship would need 2E23 J to reach 0.95c - if the propulsion 'fuel' had to be carried on board that would add to the initial mass.
2E23 J is a LOT of energy. It's roughly 400 times the annual energy production of Earth.
Re: Data size
I remember getting my first 470MB drive. It was like opening the fridge and finding Wembley stadium there.
Mind now I come back from one holiday with 5GB of video.....
AFAIK and this is where it gets weirder.
If you fire a gun, in your local frame of reference ( the ship ) the bullet will exit at it's normal muzzle velocity as far as you are concerned.
HOWEVER an stationary observer relative to you will still only see a slightly increased speed of bullet. This is the same kind of thing as 2 observers approaching each other at 0.55c only being seen to close at ~0.84c relative to a 'stationary' observer.
Re: I don't get it ...
"lightbulb "radiates" light, thus using energy to "propel" something we can see?"
AFAWK the proton mass is zero - so it can travel at c, indeed in a vacuum it HAS to travel at c. VERY light mass particles like neutrinos can get very close to c which explains why there was so much confusion over the CERN/Grand Saaso experiment recently.
SR is a very well tested theory and physical measurements at close to light speeds on particles in accelerators match the theory.
I don't know why people EXPECT the universe to be set up to allow us to explore the stars - don't get me wrong I'd love it -but it doesn't mean it will happen
Re: I don't get it ...
"can't I create a car that travels at 60mph if light travels at 50mph "
The normal, simple model for this is as the speed of light is approached the mass of the vehicle actual increases in a non-linear manner so that more and more energy is required to accelerate it. The mass becoming infinite at c unless the original rest mass was zero.
This might sound like madness but in particle accelerators that is precisely what is seen, furthermore time itself alters so that short-lived particles have a vastly increased lifetime. This all predicted by SR.
Reality is pretty weird
"The drive works by using a wave to compress the spacetime"
Sorry this has nothing to do with it. The so-called warp drive even if it eventually proves feasible allows a ship moving less than c to travel large distances quickly by altering spacetime using exotic matter and a great deal of energy.
Re: It's my understanding.....
That's because 'your' maths isn't valid. This isn't linear that's the whole point. I suggest you read a little SR
To get 1kg to 0.99c needs ~5E17 J
To get 1kg to 0.999c needs ~2E18J
To get 1kg to 0.99999c needs ~2E19J
as v->c , energy -> infinite
Even the LHC can't accelerate it's minute mass of protons to c and that uses a colossal amount of energy.
Now that you've found it try reading it and understanding what it actually means - here's a snipette :-
"by contrast a system with a truly negative temperature in absolute terms on the kelvin scale is hotter than any system with a positive temperature. If a negative-temperature system and a positive-temperature system come in contact, heat will flow from the negative- to the positive-temperature system."
"even long enough for someone to figure out how to shrink atoms down to a more convenient size"
Sorry this universe's parameters are so inconvenient - but it's the only one we've got at the moment
I know it's by definition but it's amazing how many, otherwise intelligent well-educate people, think that it's just something that will be overcome as we learn more.
Incidently there may be a potentially max. temp. around 1E32K where physics breaks down so that all predictions fail.
Re: But wait
"Please refrain from feeding the troll"
Well I know what you mean but some people are SO ignorant about Linux that it's quite hard sometimes to tell them apart from trolls
Re: But wait
"and least used OS "
(Hint : 1% of the DESKTOP market )
(Hint: think phones, routers, video recorders, televisions and supercomputers, servers.....)
It's my understanding.....
that nothing in SR forbids FTL - just that approaching c from either direction requires infinite energy for anything with non-zero mass. It does, however, hint that anything that is traveling at c+ is a very strange beast indeed
12v does NOT = 0.012kw and the rest of your absurd ramblings make even less sense.
Troll or fool - it's hard to say
Re: On the other hand ..
""corrupted and erased the hard-drive of the campaign computer server"
I quote The Register - who they quoted is anyone's guess.
In my amateur experience using Linux as a file/printer/compute/web server is easy.
( of course I'm not a politician )
On the other hand ..
a Linux installation can only improve his server
Re: How I learned to stop worrying and love TLC
"When SSD's come along, guaranteeing data destruction isn't going to be as easy.
Re: How I learned to stop worrying and love TLC
"from time to time, be spectacular data loss incidents."
And this differs from HDD how ?
"be a good idea that companies are not allowed to patent an idea "
Ideas are NOT patentable - at least in sensible countries- only implementations are patentable. I can't patent an idea for treating a disease for example but I can patent a chemical entity that has some effect that might be useful in treating that disease, even if it turns out to be not so useful in practice due to side-effects or unrealistic doses or whatever.
"Add to that the fact radio transmissions travel a little slower than the speed of light"
I think I'd alert a physicist about that !
Re: Some Forth:
No, most 8 bit forths need to JSR which , of course, can be a variable length routine depending on processsor. With the 6809 the actual code to implement NEXT is 4 bytes and can be put in-line saving the sub-routine call at the expense of slightly longer code
Re: "Can you think of a reason they [Microsoft] can get away with this?" ....
I've only use Linux but that's not the point at all.
If you've backed yourself into being dependent on Windows ( or anything else) that is a de facto monopoly, even if it's largely self-inflicted.
"Can you think of a reason they [Microsoft] can get away with this?" ....
Simple - if you MUST buy Windows Server then it's a de facto monopoly - they could charge what they want
Excellent - many thanks.
I know what you mean - I was taught Physics by a guy who had worked on the Manchester "baby" - he had a photo showing him stripped to the waist working in a cellar surrounded by racks of valves.
I thin Douglas Adams sums it up very well in a passage that kind of parodies the "Seven Ages of Man" speech from "As You Like It" but I can't just put my hand on just now. It's along the lines of - a technology that's invented when you reach a certain age is new and exciting and you could possibly get a job working with it ..........
I'm sure someone will have the passage off by heart
I can only repeat :-
"What do old people know about computers apart from the fact they invented them"
Re: What amazes me...
"Linux is unusable - even if you are a computer bod you actually want to use your computer to achieve something, this just isn't possible with an OS so full of holes, problems.."
I don't recognise any of this !
It's certainly totally usable for me and mine, we don't use anything else. It was usable ( in fact essential) for the major pharmaceutical company I worked for and that was 8-9 years ago.
This is the usual ignorance or FUD
Re: The actual reason Linux has never seen mainstream successful on the desktop...
"it's a disjointed pile of mish-mashed shit"
Strange then that I can read your wise words at all as OpenSuse is on all 6 of my computers and gives me a stable productive environment to support my many interests. There isn't one single thing I want to do that I can't do. Updates are automatic and easy, I don't have one piece of hardware that isn't supported - webcams, scanner, 2 printers, USB/serial converters, video acceleration, 3G dongle, wifi. A little bit of research before buying and sticking with a reliable distro has worked well for me.
Re: Lets not just blame java here
"Richto; who is paying you and how much?"
Trevor - I really can't believe ANYONE would pay RICHTO to produce the sort of babbling that he does.
Re: Electric jet
"but with a really big electric heater "
And the really LARGE amount of electricity ?
Re: "And running any platform without some antivirus software is reckles at best, idiotic at worst."
@Richto - from your link - final paragraph
"We should close by saying that the number of Linux viruses that could possibly damage your system in any way is currently less than 10, so don't have any nightmares"
"Except that in the US patent can be renewed"
It can't !
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