thedarkshade

That is not the usually given reason for giving it that adjective.

Something that you don't know anything about it seems dark and gloomy to everyone. It's one reason to name dark.

http://youtube.com/watch?v=WhmO1nrRtsI

even this California University professor names something dark because they yet don't know what causes it!

If I had a clump of dark matter in my hand, what would it look like? Would it be black or invisible?

Invisible and unable to be hold or touched. The adjective dark has been given to it just because we no so little about the issue, so it's still in dark "frames".

Zero is equal to or greater than infinity......Right? wrong?

No! Zero it's neutral, on its left you go on to minus infinity and on its right you go on to plus infinity. And no matter what number you take (the highest one you can imagine!) you have still not reached infinity. Any number is within infinity (+ or -) but it's never equal or grater than infinity.

So any number will always be less than infinity!

Thanks for all this guys, I'm learning Python right now, and it seems to be quiet good, really.

Thanks for everything.

thats a myth

Le's hope we're alive till 2013 to discuss about it!

Gravity

 

The FORCE that attracts two objects to each other in space. (Which force and why is it present?).

If you are referring to outer space, you got to know that objects (planets) are moving aways form each other, the universe is expanding so such attraction seems to be minute!!!

 

The empty nothingness of space, where gravity seem to excite could also be a product of space itself.

There is no nothingness , it's just dark, something that we still just don't know what it is.

 

The big bang wasn't chemical.... There was no chemicals...

yeah, you're right. Just the creation of everything from nothingness!

 

Apparently all the planets in our solar system also rotate in the same direction...

I'm sure, but I've heard somewhere (not sure where!!) that there is one planet in the solar systen, whose trajectory is normal (90 degrees) to other planets trajectories, and that somewhere round 2009 we'll be able to see that planet from our own!

OK, thanks a lot Cap'n Refsmmat. That helped a lot!

Strawman

 

You mentioned that equation had influence on particles...wrong, the thread is about renewable energy, quit trying to defend a faulty post.

If there is gravitational attraction between two objects, and everyone knows (but you seem not to) that those objects are made of particles (like everything else), and so there is gravitational attractions between them too.

Python's a good choice as you can use it for pretty much anything. It's actually quite powerful in the language sense -- you can do a lot with very little code -- and incredibly flexible.

 

You could benefit from learning the basics of programming (loops, control structures, functions, objects, etc.) with an easy-to-learn language like Python. If you ever learn a more complex language like C++, that experience will pay off greatly.

And should I follow only python's official tutorial or there is any other tutorial out there that would be more practical for starters (I am one at this:doh: )?

 

I don't know what you call a "mathematical application", but if you're going for Python then the packages "NumPy" and "SciPy" (http://numpy.scipy.org/ and http://www.scipy.org/) might be worth a look.

thanks but they seem not to work, because they require Python 2.4 and I got 2.5

If you are doing this primarily to increase your chances of getting a job, I'd spend some time discovering what programming languages are used in those jobs, then study those. Good luck with it all.

yeah, it's something like that, and thanks:-)

yes you can make mathematical programs out of it. though you need to be careful with the way it handles division. try 2/3 and see what i mean. to get the propper answer 2.0/3 should be used.

 

also, all programs can be written in something like windows notpad if you really wanted to do it that way. there ain't nothing primitive about it.

 

i use Gedit to make python programs. and C++ programs, and bash scripts and so on and so forth. anything with syntax highlighting is good.

 

and why shouldn't programming be simple?

Yes yes you're right! I guess I should go through that ENDLESS tutorial and then try to make something out of it.

Thnx

Right, I guess Superman is unfamiliar that you need to stick G into all manner of equations.

Now that is exactly why I posted [math]F=G\frac{m1\times m2}{r^2}[/math]

both. i have a bunch that are basically just scripts(for mass file convertions) and i have made a few little card game applications.

I just downloaded Python25, and it seems to be "a little" primitive, but I'll get used with it.

Can I make mathematical applications out of it? because it doesn't look that sophisticated you know!!!

just search up 'python tutorial' on google and you'll have a huge number of easy to follow tutorials to tell you how to do everything on it.

OK thanks, but the programs you write with it, are they script programs or they can be opened as any other program?

What kind of programming? What is it you're interested in doing with your programs?

Whatever, it really doesn't matter (C, C++, Perl, php, HTML, java etc) the problem is that I have not a clue of programming with either of them, and I guess some of them are easier some harder, and I would like to know with which one should I start!

 

I'm interested in doing mathematical programs mostly!

 

As for languages, personally I'd say c++ and java are the most common commercially, so if you're actually looking for a programming job, learn one of those. If you want programming to add to your skills for a more scientific job, Fortran may be better.

 

If you're more specific with what you want I'll give you my very very very opinionated views and send you some links

Thanks a lot MrMongoose, yeah I'm into more scientific stuff.

And sending some links would be just awesome!

Thnx

ok Snail, let's clarify this.

 

Superman82 wrote:

So lets say the energys already there in the form of gravity ...

 

then insane_alien corrected him:

gravity is constantly present either way still no continuous energy production.

 

And then I just agreed with insane_alien, that there is always gravity!

Gravity is a headache where particle physics is concerned.

I think the kind of disagreement (gravity vs particle physics) you mentioned is way beyond what's being spoken in this thread!

Hi guys!

 

New chances are opening up in the city I live, but few conditions are limiting me of getting them. And one of them is programming:doh: .

 

I'm thinking (and I really need to) of learning to program, so I was wondering which software would be the best to start with, and if anyone of you could recommend any books to read about that, that'd be great.

 

Any help would be mostly appreciated!

 

Thanks!!!

gravity is constantly present either way still no continuous energy production.

Yeah, just like that!

Every particle in the universe attracts another particle with a force measured by: [math]F=G\frac{m1\times m2}{r^2}[/math] Newton's universal law of gravity. There always is gravity (of course as long as there's matter) just you said!

Could you explain this? I'm not sure how you think this would work.

It wouldn't work at all, especially in real fluids. Because when molecules hit each other there is always some loss of energy, and this way sooner or later that water would stop moving. I'm also curious to know what he was thinking of when he proposed that!

In fact its stationary water that will be moved by itself and forever keep moving by itself therefore never needing to refuel and doesnt depend on anything but itself!!

False hope! Nothing can keep on moving forever without the necessity to refuel or "give" energy to it. Skeptic is right! Energy cannot be created or destroyed. And one thing that is crucial (and probably you forgot it) is that energy flows! No matter how much energy is given, there will always be need for more, because it flows, it does not recycle! For example: "Sun must have given a HUGE amount of energy to earth from its very first creation. But if we turn off sun, life would just disappear for lack of solar energy that plants need for photosynthesis"

It's like that!

Part a)

w=4500rev/min*2PR/60= 706.5m/sec

So you have 4500 rev/min, that's the frequency.You just need to multiply [math]2\pi[/math] with 4500rev/60s. then you'll get [math]\omega=2\pi\frac{4500rot}{60s}[/math]

[math]\omega=2\times 3.141592654 \times 75[/math]

and you get: [math]\omega=471.2388981\frac{rad}{s}[/math], that's the angular velocity!

 

to turn them in linear velocity you use: [math]v=\omega\times r[/math] and then just replace the datas:

[math]v=\omega\times r[/math]

[math]v=471.2388981 \times 1.50=706.85834715\frac{m}{s}[/math] which means that part you did is right!

 

to find [math]I[/math] you have [math]EK=\frac{1}{2}mr^2[/math] (like swansont said) then you have: [math]I=\frac{1}{2}mr^2[/math]

[math]I=\frac{575kg\times (1.50m)^2}{2}[/math]

[math]I=\frac{575kg\times 2.25m^2}{2}[/math]

[math]I=\frac{19293.75kgm^2}{2}[/math]

[math]I=646.875kgm^2[/math]

 

and about kinetic energy [math]EK=\frac{1}{2}mv^2[/math]

then you get: [math]EK=\frac{1}{2}mv^2[/math]

[math]EK=\frac{575kg \times 706.85834715 (m/s)^2}{2}[/math]

[math]EK=\frac{499648.7228J}{2}[/math]

[math]EK=249824.3614L[/math]

Anyone want to give me an opinion on whether I should study Philosophy or Anthropology towards a Phy/Math qual? (I mean based on what you may have seen of any of the drek I've left behind here at'forum...)

Well, I do not know your interests or what really you intend to achieve in life but Phy/Math is something very very special. I mean, by studying them you really get a sense of knowing what the world really is, why everything is the way it is, why everything happens and what makes them happen. You just know the world! You don't get stuck at anything and you feel like you really belong here. I'd strongly recommend Phy/Math!

It's very interesting to note that where I live (Kosova) intelligence coefficient is usually high. Students who have the chance to go abroad to study they always achieve a very high scale of education. but the strangest thing is that MATH and PHYSICS are the two subject that completely lack interest. Sometimes I really need someone to discuss about them but frankly speaking there are just doctors, pharmacists economists and no physicist nor "mather's", so my "hunger " of math and physics just keeps peaking.

 

So math and physics where I live are just NOT having a good period!

ok, thanks!

Glad to be useful!