Search found 96 matches

by Mettra
Thu Jun 19, 2008 1:58 am UTC
Forum: Science
Topic: Favourite Scientist - extended poll.
Replies: 32
Views: 3133

Re: Favourite Scientist - extended poll.

Given n votes and x options on a poll where Feynman is an option (x being the set of all options whose probabilities add to 1): as n approaches infinity, Pr(Feynman) approaches 1.

Mettra's Law ;)

http://www.wellingtongrey.net/miscellan ... an-do.html
by Mettra
Sun Jun 15, 2008 9:03 pm UTC
Forum: Science
Topic: Nuclear Weapons in Space
Replies: 55
Views: 5702

Re: Nuclear Weapons in Space

I'm all for sending nuclear weapons into space, but not for the reasons one might imagine. The Disclosure Project (a group that believes in the existence of extra-terrestrial presence on/around Earth) claims that it would be impossible to send a nuclear weapon into space since all the evidence point...
by Mettra
Fri Jun 13, 2008 11:56 pm UTC
Forum: Science
Topic: Nuclear Power (merged threads)
Replies: 325
Views: 52498

Re: Nuclear Power (merged threads)

Where to start... I am not asking for highly specific facts, but rather facts that are straightforeward and clear. [1] I did not mean to attack your opinion or experience however if you look at it from my point of view, one person saying they have experienced the safety of nuclear technology first ...
by Mettra
Thu Jun 12, 2008 3:39 pm UTC
Forum: Science
Topic: Nuclear Power (merged threads)
Replies: 325
Views: 52498

Re: Nuclear Power (merged threads)

As much as I do not want to badmouth your convictions, I personally cannot put much faith in anecdotal evidence. What you two have experienced in person may not be the widespread case. Also, call me a conspiracy theorist nutter, but I have huge problems with industry being responsable for the plant...
by Mettra
Thu Jun 12, 2008 1:02 am UTC
Forum: Science
Topic: Nuclear Power (merged threads)
Replies: 325
Views: 52498

Re: Nuclear Power (merged threads)

Yeah, it was a bit of Hyperbole, but I really don't think any kind of Reactor can be scaled down to a reasonable level due to the way we fission elements. Firstly need a rather high amount of enriched material, or you need incredible amounts of electrical energy, if we wanted to use directed fissio...
by Mettra
Wed Jun 11, 2008 10:29 pm UTC
Forum: Science
Topic: Nuclear Power (merged threads)
Replies: 325
Views: 52498

Re: Nuclear Power (merged threads)

This is completely ridiculous. [1] The reason our current nuclear reactors are safe is because they have multiple redundant independent safety systems. They have Walls of lead, and tens of thousands of tons of Concrete. It is important to understand that Radiation shielding does NOT SCALE. So if I ...
by Mettra
Tue Jun 10, 2008 8:45 pm UTC
Forum: Science
Topic: Value of a Bachelor of Science (Physics)
Replies: 22
Views: 4002

Re: Value of a Bachelor of Science (Physics)

@ the OP: I would say it depends on how keen your interest in physics is. I can think of a dozen people that would love you and be your best friend if you helped them write programs for their various physical modelling purposes. But that's more of a 'I'm a problem-solver, just give me the relevant e...
by Mettra
Tue Jun 10, 2008 1:42 am UTC
Forum: Science
Topic: If magic were to exist....
Replies: 56
Views: 7160

Re: If magic were to exist....

Also, if magic were to somehow exist and also not be explainable by any physical laws, then why do so many other things obey physical laws? One of the axioms of science (maybe not officially, but definitely for most if not all scientists) is that all physical processes obey physical laws. These law...
by Mettra
Fri Jun 06, 2008 1:56 pm UTC
Forum: Science
Topic: If magic were to exist....
Replies: 56
Views: 7160

Re: If magic were to exist....

If magic existed it wouldn't be magic. It would be within the realm of science. As soon as we got to the point where we could measure its presence/effects, there would be a theory for it. I'm pretty sure we would stop calling it magic. If we don't call time dilation or quantum mechanics magic, I don...
by Mettra
Mon Jun 02, 2008 4:02 pm UTC
Forum: Science
Topic: Nuclear Power (merged threads)
Replies: 325
Views: 52498

Re: Nuclear Q&A with Industry

The first is simple: Geopolitics. Where is the uranium coming from, and how stable is it as a commodity? It is my understanding that there are few countries capable of mining uranium on a large enough scale to power the world. Even if there are more than I think, the centralisation of oil in the mi...
by Mettra
Thu May 29, 2008 1:56 pm UTC
Forum: Science
Topic: Solution To Global Warming - Space as a vacuum cleaner
Replies: 11
Views: 1737

Re: Solution To Global Warming - Space as a vacuum cleaner

Baza210 wrote:Wow, people took this seriously.


Welcome to the physics forum.
by Mettra
Thu May 29, 2008 1:47 pm UTC
Forum: Mathematics
Topic: A Matter of Steam-Powered Math
Replies: 29
Views: 3132

Re: A Matter of Steam-Powered Math

In any case - what do you mean by "measuring a particle's length"? The only kind of answer that will satisfy me is some mathematical operation on its wavefunction. This is not just me being unreasonable - measuring position, for example, has a perfectly well-defined mathematical meaning i...
by Mettra
Thu May 29, 2008 3:30 am UTC
Forum: Mathematics
Topic: A Matter of Steam-Powered Math
Replies: 29
Views: 3132

Re: A Matter of Steam-Powered Math

So if it's not possible to define what it means for a particle to have volume, it can't be said that it's not permitted for a particle not to have volume, surely? I would say no to that. It's clear we're on shaky ground here, but instead of offering a positive argument, I can offer the negative one...
by Mettra
Wed May 28, 2008 7:14 pm UTC
Forum: Mathematics
Topic: A Matter of Steam-Powered Math
Replies: 29
Views: 3132

Re: A Matter of Steam-Powered Math

OK... try this. If I were to ask you to define what you meant by a particle's volume, what would you say? I'd make three length measurements along three orthogonal bases and multiply for a very coarse answer (some might call that 'size'). To get a better idea, I'd rotate my meter sticks in the appr...
by Mettra
Wed May 28, 2008 6:11 pm UTC
Forum: Mathematics
Topic: A Matter of Steam-Powered Math
Replies: 29
Views: 3132

Re: A Matter of Steam-Powered Math

The uncertainty principle is a statement about probability distributions of operators on the particle's wavefunction, not a statement about the particle itself. It doesn't rule out knowing the position of a particle to any arbitrary degree of precision. [1] Perhaps a better question would be - is i...
by Mettra
Wed May 28, 2008 4:51 pm UTC
Forum: Science
Topic: Anyone read this article in Seed Magazine?
Replies: 6
Views: 1322

Re: Anyone read this article in Seed Magazine?

Yes, the 'extra information' phenomenon is definitely something crazy. I've always thought it odd how, for example, some quantum states 'know' to avoid infinite negative potentials (like in some big bang theories) and suddenly reverse 'course' when they start to encounter one. It's like they have li...
by Mettra
Wed May 28, 2008 4:29 pm UTC
Forum: Science
Topic: F-sharp
Replies: 18
Views: 2068

Re: F-sharp

Any F-sharp played after any E, but it's much, much worse the lower they are. One possibility is that you have 'perfect pitch' and the F#'s and E's are all very slightly out of tune with your head. With using even temperament, the pitches of some notes are shifted up slightly and some are shifted d...
by Mettra
Wed May 28, 2008 4:26 pm UTC
Forum: Mathematics
Topic: A Matter of Steam-Powered Math
Replies: 29
Views: 3132

Re: A Matter of Steam-Powered Math

Does quantum mechanics rule out point masses? This is a very pointed (no pun intended) question. There are two different 'meanings' of point mass, one which is a convention in Newtonian mechanics and the other which is a 'real' physical object. In Newtonian mechanics, physicists often use the idea ...
by Mettra
Wed May 28, 2008 1:10 am UTC
Forum: Science
Topic: Anyone read this article in Seed Magazine?
Replies: 6
Views: 1322

Re: Anyone read this article in Seed Magazine?

Reality as an emergent property? Seems kinda plausible. Agreed. I'd actually say it's certain if by "reality" we mean the classical, macroscopic world of our everyday perceptions. In fact there are good reasons to believe that even such intuitively fundamental notions as time and space ar...
by Mettra
Tue May 27, 2008 8:14 pm UTC
Forum: Science
Topic: Eclipses, Interference, Sound, and Sound Science.
Replies: 2
Views: 758

Re: Eclipses, Interference, Sound, and Sound Science.

I've never had anything to do with atmospheric studies, so I can't help you with the technical feasibility of the rather generic proposal in the article. However, just from reading the above article, it sounds like a strong case hasn't been made for the infrasound theory. It sounds like someone has ...
by Mettra
Tue May 27, 2008 4:36 pm UTC
Forum: Science
Topic: Physics Energy Question
Replies: 16
Views: 2235

Re: Physics Energy Question

which is??? remember from up top im only y12 so a few things may need to be explained a little y does equilibrium effect energy? Think about it like this. Draw two free body diagrams - one at the initial conditions and the other when the mass has been displaced. Since you are using mg, I assume the...
by Mettra
Tue May 27, 2008 3:48 pm UTC
Forum: Science
Topic: F-sharp
Replies: 18
Views: 2068

Re: F-sharp

The seventh note of the twelve in the Renaissance scale - now called F sharp (F#) - was a particular nuisance. It sounded lousy when combined with almost every other note, creating toe-curling intervals that reminded listeners of howling wolves, and they became known as 'wolf intervals'. Since thes...
by Mettra
Tue May 27, 2008 2:54 pm UTC
Forum: Science
Topic: Nuclear Power (merged threads)
Replies: 325
Views: 52498

Re: Nuclear Power, what's your issue with it?

I would think that not letting any sunlight through to the earth would cause bigger problems than global cooling. Namely global plant death. This is probably why nobody took your "capture all sunlight" as "capture ALL sunlight" ;-) I mentioned other natural systems in previous p...
by Mettra
Mon May 26, 2008 11:34 pm UTC
Forum: Science
Topic: Nuclear Power (merged threads)
Replies: 325
Views: 52498

Re: Nuclear Power, what's your issue with it?

You stated that "So vast swathes of the world would become much much colder than they usually are". That's not going to happen, baring impossible designs for solar panels (or very highly inefficient ones). Which is why I assumed you just didn't understand the laws of thermodynamics. The u...
by Mettra
Mon May 26, 2008 7:12 pm UTC
Forum: Science
Topic: Nuclear Power (merged threads)
Replies: 325
Views: 52498

Re: Nuclear Power, what's your issue with it?

I hate it when I have people arguing on my "side" who have no idea what they're talking about. Please read this page, and make sure to understand it before continuing this discussion: http://en.wikipedia.org/wiki/Laws_of_thermodynamics Essentially, no, the heat doesn't end up "turnin...
by Mettra
Mon May 26, 2008 6:38 pm UTC
Forum: Science
Topic: Sound Wave Frequencies
Replies: 27
Views: 3812

Re: Sound Wave Frequencies

just to make it clear: if you are stuck with giving a frequency and have it played you will not be able to have something like chords coming out of the speaker. you would need the buffer-playback thing for that. it might be worth trying to play two rapidly alternating frequencies, but i have no ide...
by Mettra
Mon May 26, 2008 6:19 pm UTC
Forum: Science
Topic: Nuclear Power (merged threads)
Replies: 325
Views: 52498

Re: Nuclear Power, what's your issue with it?

Also, solar power is very useful locally but not 'globally'.... we wouldn't tap all the solar energy even if we could - we would experience global cooling, if you will, and die No, that's not true. What do you think happens to solar energy after it's "tapped"? It's reintroduced back into ...
by Mettra
Mon May 26, 2008 4:53 pm UTC
Forum: Science
Topic: Nuclear Power (merged threads)
Replies: 325
Views: 52498

Re: Nuclear Power, what's your issue with it?

Exacting and processing uranium is not a zero-cost operation. I just want to point that out. Solar power is certainly not a zero-cost operation, and is in it's current stages, wildly inefficient, but solar panels require significantly less maintenance then does a nuclear power plant, and takes adva...
by Mettra
Sun May 25, 2008 8:27 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 722508

Re: Common Questions

Yeah, the acceleration at a given time is higher for the mars drop, but the acceleration at a given distance isn't. da/dt is greater for Mars, and da/dr is the same for all objects. It would be the rate of acceleration, but it would also affect the acceleration, the increase of velocity over time, ...
by Mettra
Sun May 25, 2008 6:37 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 722508

Re: Common Questions

Basically, while the instant acceleration at any given point is always the same for any object, if you graphed the speed over the course of the whole fall, and took the derivative of it, the graph of acceleration over time should have Mars as slightly greater at any given time, due to the distance ...
by Mettra
Sun May 25, 2008 4:59 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 722508

Re: Common Questions

And so on and so forth if I got the math roughly close. And so Mars, even from an inertial reference point, would be seen to have a greater acceleration over the whole trip, as can be seen looking at the speeds of both throughout the trip or the derivative thereof, because it's instant acceleration...
by Mettra
Sun May 25, 2008 2:09 pm UTC
Forum: Science
Topic: Paradox Argument
Replies: 7
Views: 1134

Re: Paradox Argument

If you can detect something in the future, you can probably use a high-accuracy detector to violate the Heisenberg uncertainty principle. Also, relativistically, there is no frame of reference for which the detected event will be in the past if the frame of reference is close enough to contact you b...
by Mettra
Sun May 25, 2008 1:56 pm UTC
Forum: Science
Topic: [Physics] Time Travel
Replies: 70
Views: 7871

Re: [Physics] Time Travel

Sorry, but I would say that time-dilation is no more time-travel then freezing yourself and then thawing yourself. You just make the surroundings seem to go faster, and you can't go back. You can 'travel' arbitrarily far into the future in an arbitrarily short amount of time. I don't see the differ...
by Mettra
Sat May 24, 2008 11:51 pm UTC
Forum: Science
Topic: Australian man claims perpetual motion machine
Replies: 58
Views: 6630

Re: Australian man claims perpetual motion machine

That was awesome.. I read through this guys webpage (procrastination from revision).. and I was amazed by his arguments. It was so... completely... awful. Yet somehow very amusing, and slightly scary that people out there who really think like this. Who have no grasp on the concepts of Physics or i...
by Mettra
Sat May 24, 2008 10:54 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 722508

Re: Common Questions

Free-falling objects experience the same acceleration no matter their mass. Not true, say for example you have a heavy object and a light one. Say, for object #1 you have a bowling ball, and for object #2 you have.. Mars. Now if you were to drop Mars (neglecting air resistance), it would hit the gr...
by Mettra
Sat May 24, 2008 10:48 pm UTC
Forum: Science
Topic: Paradox Argument
Replies: 7
Views: 1134

Re: Paradox Argument

I made assumptions as well, specifically that such a device is impossible/nonsensical so that it must exist in a place with different laws of physics. Therefore, one would assume this place has some form of relativity where the laws are uniform throughout the universe such that this behavior would b...
by Mettra
Sat May 24, 2008 10:40 pm UTC
Forum: Science
Topic: Paradox Argument
Replies: 7
Views: 1134

Re: Paradox Argument

I have a device that can monitor the temperature of the device three minutes in the future. This is an impossible mechanism so it belongs probably in the logic or math forum instead of the physics forum. I don't see any paradox in play. If the detector measures heat, and heat cannot enter the syste...
by Mettra
Sat May 24, 2008 8:19 pm UTC
Forum: Science
Topic: Another data across long distances (nearly) instantly theory
Replies: 5
Views: 1124

Re: Another data across long distances (nearly) instantly theory

*Chime in for agreement* When you push that rod, what you are doing is pressing the atoms on the outside of it into the atoms right beside them. Those in turn press the atoms next in line and so on until you get to the end of the rod. Atoms cannot move faster than (or as fast as) light. This explana...
by Mettra
Sat May 24, 2008 5:03 pm UTC
Forum: Science
Topic: I have a question and an idea that pertains to it
Replies: 32
Views: 4147

Re: I have a question and an idea that pertains to it

If you think a behavior is impossible and then see someone do it that means that your assumption that it was impossible in the first place was wrong, not that they possess superhuman abilities. Wait that would then imply that the medical books are wrong about how much the human body can take before...
by Mettra
Sat May 24, 2008 3:34 am UTC
Forum: Science
Topic: I have a question and an idea that pertains to it
Replies: 32
Views: 4147

Re: I have a question and an idea that pertains to it

Maybe you subconsciously wanted to punish yourself for what you did one dark night in September. But seriously: do not confuse science with philosophy. Relativity is not relativism. Quantum mechanics does not mean we create reality with our brains. Go find some more books on physics and read them. ...

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