Strange

No one is not affected by changes made to the other. All entanglement means is that if your measure some attribute of one of them, you know what someone measuring the same (or a related value) will measure for the other.

No. Spin is not the same as a particle rotating about its axis; so there is no resistance. Quantum spin is quantised so it always has specific values (e.g. + or -1, up or down); that means there can be no resistance because it cannot "slow down". All you can do is measure spin up or down and compare that to the other one of the entangled pair. You will find that these are correlated. But you can only determine that correlation after you transmit (at no more than light speed) the measurement from one person to the other.

Can't you just use conservation of momentum to calculate this? The velocity change of the main group will be the velocity of the ejected kid times the mass ratio of the kid and the group. (And by assuming the kids all have roughly the same mass, you can just use the number of kids to simplify this).

This is spin as an intrinsic quantum property. There is no resistance to it; it is not mechanical rotation.

I assume you mean "law" in a legal sense? (Rather than a physical law, for example.) In which case, it depends where you are. In Europe electrical equipment must be either grounded or "double insulated". I don't know about other jurisdictions. I'm sure there are some where there are no regulations at all.

Entanglement exists. But it cannot be used to communicate information faster than light.

It is not at all obvious. What is the evidence for this?

Huh?

I will explain post 16 a bit, as it was mine. In an integrated circuit (where most of my experience is) there are typically two power supply lines called Vdd and Vss (for historical reasons). You can think of these as being connected to the two terminals of a battery. Vss is normally considered to be 0 volts. When I started out, Vdd was typically 5 volts. (Over time as transistors have got smaller, Vdd has dropped to 3.3V then 1.6V and 1.2V ... I don't know where it is now... And there my be several different Vdd and Vss suplies in complex circuits.) The only important thing in the circuit is the difference between Vss and Vdd. Because Vss is considered to be 0V it may be shown with a ground/earth symbol. In reality, it may not be connected to ground at all. If the electronics is controlling some high-voltage equipment, it might be that Vss is 200V and Vdd is 205V. But, as studiot says, there are cases where the ground is important as a shared reference between different pieces of equipment. And for power distribution, it can be vital because you need to know that the exposed metal parts of equipment are safe (i.e. connected to ground) so you don't get a shock. Hope that helps.

It is not clear there is a speed associated with them. And they certainly cannot be used to communicate information anyway.

Why are you posting exactly the same nonsense as your other thread?

I am just pointing out that you believe there is a problem because you don't understand what the theory actually says. Your objection is that "the universe must be getting larger therefore it must be finite". The big bang model does not say that the universe is getting larger (within some larger or higher dimensional space). Therefore your objection is moot. Being able to list a number of finite things tells us nothing about whether the universe is finite or not. All it tells us is that your imagination is limited. This is an argument from incredulity. If the universe is infinite, then there are an infinite number of atoms. If you don't like that, it doesn't really matter. As far as we know, the universe has always filled all of space. You assume the energy is finite. Fine. You are free to believe that, if you wish. But it is just a baseless assumption. There is no reason for anyone to consider it true without evidence. True. But totally irrelevant as we are discussing science. Actually, you aren't discussing science. You are just stating your personal belief; that is religion not science.

I think you will have to say which terms you do not understand, then we can try and explain better...

That is the point I was making in post 8. I suppose electrical engineers are worried about an absolute zero reference, that is connected to ground/earth. But in electronics, we usually don't care; it is just an arbitrary reference. My circuit only depends on the difference between Vdd and Vss - it doesn't matter if Vss is 0V or 200V. p.s. just looked at the OP again: it isn't clear if he is referring to electrical or electronic circuits. I assumed the latter as that is my background.

I was more talking about the zero volt supply in an electronic circuit (which, despite being shown with a 'ground' symbol, is often not attached to ground/earth at all).

That is largely a matter of designing with suitably low supply line resistance, appropriate power supply noise filtering, etc.

See post #6.

The speed of light (in any direction) is always the same, independent of source or observer.

I don't think special relativity is either archaic or incorrect. It is accurate for conditions where there is no (or little / constant) gravity. It is mathematically simple and easy to understand. General relativity requires advanced mathematics so it makes sense to teach SR to undergrads. I'm not sure how that is relevant as SR specifically excludes gravity (as a force or otherwise). However, Newtonian gravity is still used because (again) it is much simpler than GR and good enough in most cases.

Imagine you have circuit powered by a 6V battery, for example. You can mark the negative terminal as 'ground' and then the other terminal will be +6V. Or you can mark the positive terminal as ground and then the other terminal will be -6V.

There are, broadly, two classes of materials: metals/conductors and non-metals/insulators (well, three if we include semiconductors). In metals, there are many free electrons that can carry the electric current. The resistance of different metal varies so, to get the same current, you need to provide more voltage. Voltage times current equals power: this is where the energy for the heat comes from. (Apologies to the purists for horribly mangling the units there in the cause of simplicity!) In a non-conductor, like glass, there are few free electrons and so current doesn't flow (until you provide so much voltage that the material breaks down).

To add detail to imatfaal's comment, you might want to read this: http://math.ucr.edu/home/baez/physics/Relativity/BlackHoles/fall_in.html There are descriptions and animations of what it would be like to enter various kinds of black holes here: http://jila.colorado.edu/~ajsh/insidebh/index.html

It is just a symbol to show where the (arbitrary) zero volt reference is in the circuit. It doesn't mean this point is grounded. It just means that point is to be considered as 0V; voltages above that are positive and voltages below it are negative.

The "expanding universe" is just an analogy. It isn't supposed to be taken literally. http://arxiv.org/abs/0707.0380 That is not what the theory says and so you are arguing against a straw man. You keep making this claim but provide no evidence to support it. Simple maybe. But with no evidence to support this claim, I see no reason to take it seriously. But you are discussing science; you are making claims about the real, measurable universe. You seem to expect us to just accept what you say but you provide no justification or reason to accept it. Why is that?

Magnetism and electrostatic forces are the same thing (clue: it is called electromagnetic force for a reason) so I don't see why it would make any difference. It is the acceleration that is important not the force causing it.