You are correct jarekipe in saying that we use it to predict.
from what i understand of this the black hole is not creating energy it is substituting some of it's mass for energy. just like a nuclear reaction does.Farsight said:There's another thread about "Hawking radiation":
The idea is that "virtual particle pairs" are created near the event horizon. The negative energy fluctuation falls into the black hole, and the positive energy fluctuation is freed into the Universe. So in this respect black holes would be creating energy.
I have to say I'm not utterly convinced by this myself.
From the big bang. The energy of the universe is the sum of the kinetic energy of each particle, and the potential energy interactions. Mass is equivalent to energy via E = mc^2, so throw that in too. There is the same amount now as there was 1 sec following the big bang. Why/How all this energy was created is not known. It should be noted that net energy is what's conserved, so a particle and it's antiparticle both created out of nothing doesn't violate any conservation laws. That's the basis of Hawking radiation (black holes radiating energy). My personal theory, which is not backed up by observations at all, as that there is another universe which consists of what we'd call anti-particles. The fact that there is much more matter than anti-matter in the observable universe hasn't been explained.Irresistible_Force said:Ok, from the big bang, to the Stars, as radiation to the plants, eaten by animals that I just had for supper...no really.
So really, where does it come from?
umm... "defying gravity" to you evidently just means not falling down. It doesn't take any energy not to fall down.This is a question I find fascinating and have no answer. I have read the answers but I believe there is more to a magnet than meets the eye. I believe there is another force at work that we have not discovered. I am not referring to magnetism itself as I belief a magnet may simply act as a lens for another energy source that we know little about such as gravity. Notice the mathematical formulas for gravity and magnetism are similar. Some of the answers refer to work and state that a magnet does not perform work therefore does not expend or require energy; I say it does work when it is stuck to another object as it defies gravity without any external energy source. In fact magnets can support holding weights many times their own mass. I have no answer for this but who ever unlocks this mystery will be worth a fortune.
Many of the fundamental forces that initially seem separate have been shown to be manifestations of the same force. For example, the electric force and the magnetic force have been discovered to be caused by the same thing. That's why we now refer to it as one force, the electromagnetic force. If I recall correctly, you can actually derive the magnetic force from the electric force + special relativity...but I could be wrong about that. Since then they discovered that the weak nuclear force is also caused by the same thing as the electromagnetic force, so all three together are called the electroweak force. It seems that the strong force and gravity are not part of the same force. However, according to the standard model all forces are mediated by gauge bosons which is why their formulas may look similar. The difference is that they use different kinds of bosons.This is a question I find fascinating and have no answer. I have read the answers but I believe there is more to a magnet than meets the eye. I believe there is another force at work that we have not discovered. I am not referring to magnetism itself as I belief a magnet may simply act as a lens for another energy source that we know little about such as gravity.
Actually permanent magnets can do work and then do have stored energy. A permanent magnet can be demagnetized from the magnetic load put on it. Have a look at the demagnetization curve: http://femm.foster-miller.net/wiki/PMEnergySome of the answers refer to work and state that a magnet does not perform work therefore does not expend or require energy; I say it does work when it is stuck to another object as it defies gravity without any external energy source.
There is no stored energy in a permanent magnet. Poorer quality magnetic materials become demagnetized with use because the magnetic domains don't hold the magnetized positions under stress as well as the newer magnetic materials do. Given the same initial magnetization, old fashioned hardened steel will lose it's magnetism relatively quickly with use, but the average ferro-ceramic magnet, as in an audio speaker, a newer, better material, will stay magnetized indefinitely despite constant use. In the case of the former no energy is being expended by the magnet with each use, rather, the orientation of the magnetic fields of its "domains" are all going out of alignment. In the latter, better, material the orientation is not subject to slippage like this.Actually permanent magnets can do work and then do have stored energy.