Lupo-sized cars, or even smaller ones, are common in Europe and useful for many people. They excel at driving in the city and it's easier to find good parking spots. Of course, for hauling or highway driving they are not quite the optimum.
Actually, F=dp/dt is the way to state Newton's 2nd Law (and it is the way he stated it originally) not only because of relativity but also because of rockets, for example, i.e. anything that has a changing mass. A rocket would just be the example that's most often used.
Also, while I agree with what you said about the distinction between relativistic and invariant mass, one should note that whenever physicists talk about "mass", they always refer to the rest mass of a body. Modern physics has completely eliminated the use of the so called relativistic mass.
Fuel shortage isn't just a problem that exists in the fossile sector. There isn't much nuclear fuel (i.e. U) left, either. It might last another 50 years or so, but that's it. Compare that to the average time a new nuclear power plant takes to amortize and suddenly nuclear power doesn't really work as a long-term solution any more.
While I agree that your work sounds quite impressive and is definitely not easy, working *for* a scientist doesn't automatically make your work scientific. Experimental physicists needs lots of complicated, delicate equipment which is built by mechanical engineers or other highly trained specialists, but the equipment is just tools that the scientists need to do their real scientific work in the end.
The Particle Physics Booklet (July 2006 edition) states a mean life of the proton of greater than 10^31 a. The age of the universe in the order of 10^9 a. Please note that the mean life I cited is an experimental physicist's way of saying "I don't care if it decays at all, but it definitely has a greater mean life than 10^31 a". As far as I know the proton is understood to be stable.
Proton decay (which would violate the baryon number symmetry!) is highly speculative and not within the realm of what we can physically calculate or observe (i.e. within the Standard Model).
Apple doesn't even sell the "full" OS, they only sell upgrades for the reason that you stated, i.e. that they have already sold a full version of the OS with the computer itself.
FORTRAN is still pretty common in science, especially for doing numerical physics stuff. It has quite elegant ways of handling matrices, for example, although the syntax feels arcane (at least F90 and newer don't require white spaces at the beginning of lines anymore).
Those are security updates and bugfixes that Apple provides in addition to their for-sale releases that also add features. I don't think it's fair to compare the MS Service Packs to, say, the improvements that Tiger brought.
That's exactly what I would suggest (and I don't know why the comment is rated 0). If they started narrowing the shoulder a mile or two ahead of the bridge, nobody would even notice the difference.
Maybe street cars are the way of the future. Most cities in Europe have light rail networks that connect important places right in their downtown areas and reach out to the suburbs, also. There has been a recent street car revival in France where several cities (e.g. Strasbourg) have recently installed new street car systems, because they are a lot cheaper than digging subway tunnels and can be almost as efficient.
You don't have to worry about or remember schedules in most European towns either, as most street car and subway lines run on a 5 or 10 minutes interval, sometimes even 24/7 (and you don't have to worry about finding / paying for a parking spot either).
While your Bible citation applies too, most people would say that the Rod of Asclepius is a symbol of Greek mythology (probably older than your Bible text)
Wikipedia text: http://en.wikipedia.org/wiki/Rod_of_Asclepius
The summary says:
The Rod of Asclepius is an ancient Greek symbol associated with astrology and healing the sick with medicine. It consists of a serpent entwined around a staff. Asclepius, the son of Apollo, was practitioner of medicine in ancient Greek mythology. He was instructed in medicine by the centaur Chiron also connected to the constellation Ophiuchus.
It would make sense to use it like the gp did though. It would sure beat the confusing use of the world development to classify those countries (developing c., underdeveloped c., etc.).
Exactly! I think it's really weird to read all those posts about how they should teach this program and that tool, because at least in my understanding Computer SCIENCE means studying the theory and backgrounds behind all that.
Re:For those interested in a modern intro to the m
on
Charles Darwin Online
·
· Score: 1
I think the problem with Quantum Mechanics might be the fundamentally statistical nature of it. Think of Heisenberg's Uncertainty Principle, for example, p and x can't both be measured accurately at the same time. And that is not just because our instruments are interfering, but that's a fundamental feature of small scale physics in general.
Observables that are fundamentally statistical might interfere with the concept of a Free Will...
Short answer: no. The theory of electromagnetic fields in a vacuum usually uses Dirchlet boundary conditions for an infinitely far boundary. And that makes sense, because physical fields should vanish as the distance from the source approaches infinity. In addition to that, the fields are smooth functions that don't just drop to zero at some point. All that means that the range of an electromagnetic field is inifite, although you'd have to take retardation into account, i.e. that fact that the field propagates at mostly the speed of light.
While you can do some awesome stuff in solid state physics and optics regarding transparent materials and other nifty things, it's impossible to shield the microscopic fields of the matter, so there'll always be some interaction.
The only working theory of gravity that we have is the theory of General Relativity, and that is not a quantum theory, so let's not talk about gravitons.
You can just consider a net force field, that includes the Earth, the sun and all other masses that generate a gravitational field... Now that you have that field, it will act on you during your free fall period. And because all other effects are small compared to the Earth's gravity, your vector field will basically still look like the force is directed towards the center of mass of the Earth.
Newton II (F = dp/dt) states that you will feel an acceleration in that case. And being accelerated is something you can always measure, as opposed to being somewhere without any net forces.
Just have a look at your old physics notes from high school, it's all in there.
The symmetry transformations of special relativity are those of the Poincaré group, that is Lorentz transformations. Now, all intertial reference frames are equally good, but you get from one to the other by applying a Lorentz transformation.
A photon's frame of reference isn't a valid one to perform calculations in to begin with, because the transformation matrix contains elements of the form 1/(1-v^2/c^2), so if you try to transform into or out of a frame of reference that moves with a relative velocity of c, you encounter infinite matrix elements => it is not a valid transformation.
I use JOE as my general purpose text editor, because I don't have to think about key strokes there, my hands perform them without thinking. CTRL+K, CTRL+Q.
When I studied dynamic systems in an undergrad class the prof said that somebody using the phrase "chaos theory" is a clear indicator that whoever uses it has no idea what he's talking about. Nonlinear systems are found in all fields of physics, there is no such thing as a chaos theory.
Sorry, off-topic, but there are just way too many arm chair physicists around here..
For me, power consumption is a big issue, and nothing beats the below 20 W power supplies of integrated devices, such as my SMC router. In addition, it's a lot smaller than any computer case and cheaper too, if you don't have a box to spare.
I have set up some Linux routers and I agree that it's fun and educating, though.
Slashdot Mirror
Is DOS trademarked? The dictionary says that DOS is (any) Disk Operating System, although that general sense is nowadays seldom used.
Lupo-sized cars, or even smaller ones, are common in Europe and useful for many people. They excel at driving in the city and it's easier to find good parking spots. Of course, for hauling or highway driving they are not quite the optimum.
Also, while I agree with what you said about the distinction between relativistic and invariant mass, one should note that whenever physicists talk about "mass", they always refer to the rest mass of a body. Modern physics has completely eliminated the use of the so called relativistic mass.
Fuel shortage isn't just a problem that exists in the fossile sector. There isn't much nuclear fuel (i.e. U) left, either. It might last another 50 years or so, but that's it. Compare that to the average time a new nuclear power plant takes to amortize and suddenly nuclear power doesn't really work as a long-term solution any more.
While I agree that your work sounds quite impressive and is definitely not easy, working *for* a scientist doesn't automatically make your work scientific. Experimental physicists needs lots of complicated, delicate equipment which is built by mechanical engineers or other highly trained specialists, but the equipment is just tools that the scientists need to do their real scientific work in the end.
Proton decay (which would violate the baryon number symmetry!) is highly speculative and not within the realm of what we can physically calculate or observe (i.e. within the Standard Model).
What's wrong with csh?
Apple doesn't even sell the "full" OS, they only sell upgrades for the reason that you stated, i.e. that they have already sold a full version of the OS with the computer itself.
FORTRAN is still pretty common in science, especially for doing numerical physics stuff. It has quite elegant ways of handling matrices, for example, although the syntax feels arcane (at least F90 and newer don't require white spaces at the beginning of lines anymore).
Those are security updates and bugfixes that Apple provides in addition to their for-sale releases that also add features. I don't think it's fair to compare the MS Service Packs to, say, the improvements that Tiger brought.
That's exactly what I would suggest (and I don't know why the comment is rated 0). If they started narrowing the shoulder a mile or two ahead of the bridge, nobody would even notice the difference.
You don't have to worry about or remember schedules in most European towns either, as most street car and subway lines run on a 5 or 10 minutes interval, sometimes even 24/7 (and you don't have to worry about finding / paying for a parking spot either).
It would make sense to use it like the gp did though. It would sure beat the confusing use of the world development to classify those countries (developing c., underdeveloped c., etc.).
Exactly! I think it's really weird to read all those posts about how they should teach this program and that tool, because at least in my understanding Computer SCIENCE means studying the theory and backgrounds behind all that.
Observables that are fundamentally statistical might interfere with the concept of a Free Will...
Short answer: no. The theory of electromagnetic fields in a vacuum usually uses Dirchlet boundary conditions for an infinitely far boundary. And that makes sense, because physical fields should vanish as the distance from the source approaches infinity. In addition to that, the fields are smooth functions that don't just drop to zero at some point. All that means that the range of an electromagnetic field is inifite, although you'd have to take retardation into account, i.e. that fact that the field propagates at mostly the speed of light.
While you can do some awesome stuff in solid state physics and optics regarding transparent materials and other nifty things, it's impossible to shield the microscopic fields of the matter, so there'll always be some interaction.
The only working theory of gravity that we have is the theory of General Relativity, and that is not a quantum theory, so let's not talk about gravitons.
It's not an inverse square law, E and B are proportional to 1/r. I agree with the rest, though :)
Newton II (F = dp/dt) states that you will feel an acceleration in that case. And being accelerated is something you can always measure, as opposed to being somewhere without any net forces.
Just have a look at your old physics notes from high school, it's all in there.
A photon's frame of reference isn't a valid one to perform calculations in to begin with, because the transformation matrix contains elements of the form 1/(1-v^2/c^2), so if you try to transform into or out of a frame of reference that moves with a relative velocity of c, you encounter infinite matrix elements => it is not a valid transformation.
It looks like we need a "Weird Al"-category judging by how often articles about him appear on Slashdot.
I use JOE as my general purpose text editor, because I don't have to think about key strokes there, my hands perform them without thinking. CTRL+K, CTRL+Q.
Sorry, off-topic, but there are just way too many arm chair physicists around here..
I have set up some Linux routers and I agree that it's fun and educating, though.
A few million kilometers more or less are not significant if the objects you want to observe are lightyears away.