Ask a physicist anything. (6)

[Wiccan_Child]

God told me @ Wiccan Child (I figure it out after som wiccans sang "what is gold, what is gold" to me)

God bless Jacob! I am not a anti-semit! @ chalnot

Is it true that you do agua regis by bubbeling bubbles in salt water? The N in the air will react with H and O in the water creating HNO3, while The other H in the water will react with the Cl in the salt creating HCl... or am i wrong?

Aqua regia is created by "freshly mixing concentrated[1] nitric acid and hydrochloric acid, usually in a volume ratio of 1:3, respectively."

 

[razeontherock]

Ok, so what made the aluminum float in your viddy?

 

[mzungu]

Ok, so what made the aluminum float in your viddy?

Electromagnetic induction will cause aluminium to float!

 

[Maxwell511]

I see.

(And trying to grasp exactly what you mean by "generalization of rotations", I learned what an "inner product" is. Ah, vectors, sometimes I really do miss playing with you! )

Unitary basically means that the transform preserves the "units" of the system. If you rotate a triangle, the length of the sides of the triangle stay the same. In generalizations this could mean that if you looked at the system in a different way things like the total relative energy of the system would stay the same.

Assuming that reality is independent of how it is observed or analyzed this means that physical theories need to be consistant. Changes in rotation does not change the area say of the triangle, changes in the method of observation should not change the laws of physics.

 

[Lillen]

I don't understand anything of what you just said, but OK!

 

[mzungu]

Unitary basically means that the transform preserves the "units" of the system. If you rotate a triangle, the length of the sides of the triangle stay the same. In generalizations this could mean that if you looked at the system in a different way things like the total relative energy of the system would stay the same.

Assuming that reality is independent of how it is observed or analyzed this means that physical theories need to be consistant. Changes in rotation does not change the area say of the triangle, changes in the method of observation should not change the laws of physics.

But would not the energy expended in order to rotate the triangle not affect the angles if the energy applied was not uniformly applied to the whole triangle?

 

[Chalnoth]

But would not the energy expended in order to rotate the triangle not affect the angles if the energy applied was not uniformly applied to the whole triangle?

This isn't a real rotation, as in it's not a physical object being rotated relative to other things. It's just a different perspective.

 

[Tim the Plumber]

But would not the energy expended in order to rotate the triangle not affect the angles if the energy applied was not uniformly applied to the whole triangle?

He is talking about the mathamatical idea of rotating the concept of the triangle or whatever.

Picture a TV program about say a new bridge being built and the show goes into a computer graphic which shows how the foundations work in respect to the ground. The bridge is not going any where it's just our notional poin of view that's flying around all over the place including "viewing" the bridge from under 20 feet of solid rock.

 

[mzungu]

He is talking about the mathamatical idea of rotating the concept of the triangle or whatever.

Picture a TV program about say a new bridge being built and the show goes into a computer graphic which shows how the foundations work in respect to the ground. The bridge is not going any where it's just our notional poin of view that's flying around all over the place including "viewing" the bridge from under 20 feet of solid rock.

Sorry my misunderstanding.

 

[mzungu]

Very interesting documentary. A MUST WATCH! The Changing Ape | Watch Free Documentary Online

 

[mzungu]

WOW!!!!! BBC News - Antimatter belt around Earth discovered by Pamela craft

 

[Chalnoth]

WOW!!!!! BBC News - Antimatter belt around Earth discovered by Pamela craft

Yes, just bear in mind that this isn't a huge amount of anti-matter. It's basically trace amounts that get trapped in the Earth's magnetic field after energetic interactions that produce the anti-matter.

The satellite that measured this anti-matter found 28 anti-protons after 850 days of collecting.

 

[Wiccan_Child]

Yes, just bear in mind that this isn't a huge amount of anti-matter. It's basically trace amounts that get trapped in the Earth's magnetic field after energetic interactions that produce the anti-matter.

The satellite that measured this anti-matter found 28 anti-protons after 850 days of collecting.

I've heard people claim that governments are going to start making bombs. Tiny, particle-sized bombs

 

[Eudaimonist]

Now if we only had dilithium crystals...


eudaimonia,

Mark

 

[Mr. Pedantic]

Yes, just bear in mind that this isn't a huge amount of anti-matter. It's basically trace amounts that get trapped in the Earth's magnetic field after energetic interactions that produce the anti-matter.

The satellite that measured this anti-matter found 28 anti-protons after 850 days of collecting.

And those 850 days found enough anti-protons to power an LED for a few nanoseconds. So basically to run your computer for a day you would need to be collecting anti-protons for a longer period of time than the universe has been in existence.


Just to put it in a bit of perspective...

 

[Chalnoth]

And those 850 days found enough anti-protons to power an LED for a few nanoseconds. So basically to run your computer for a day you would need to be collecting anti-protons for a longer period of time than the universe has been in existence.


Just to put it in a bit of perspective...

The other issue is that there's going to be a lot of contamination by normal matter protons, meaning you're going to have to separate protons from anti-protons in your collector to extract useful energy, and the opposite charges of the two are going to resist that. Strongly.

 

[mzungu]

Yes, just bear in mind that this isn't a huge amount of anti-matter. It's basically trace amounts that get trapped in the Earth's magnetic field after energetic interactions that produce the anti-matter.

The satellite that measured this anti-matter found 28 anti-protons after 850 days of collecting.

Yes but isn't it exciting news?

 

[Chalnoth]

Yes but isn't it exciting news?

Eh, it's kinda neat I guess I'm just so used to the idea of anti-matter being out there in trace amounts. If you'd asked me before reading this paper whether I thought it was likely that some anti-matter was trapped in the Van Allen Radiation Belts, I am reasonably certain I would have said it is highly likely, in trace amounts.

 

[mzungu]

Eh, it's kinda neat I guess I'm just so used to the idea of anti-matter being out there in trace amounts. If you'd asked me before reading this paper whether I thought it was likely that some anti-matter was trapped in the Van Allen Radiation Belts, I am reasonably certain I would have said it is highly likely, in trace amounts.

Yes but how does it not interact with matter? What keeps these antiprotons from colliding and annihilating matter particles?

 

[Chalnoth]

Yes but how does it not interact with matter? What keeps these antiprotons from colliding and annihilating matter particles?

Oh, they do. Matter in general is pretty sparse up there, so it can take a while to annihilate. So there are enough produced and trapped for there to be a measurable trace of anti-matter. It will always end up annihilating eventually, but as long as it doesn't hit anything for a while, it will stick around.