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Everything posted by Strange
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Boston Dynamics. https://www.youtube.com/channel/UC7vVhkEfw4nOGp8TyDk7RcQ
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This is an example of you getting distracted by irrelevant details. When people talk about how the universe looked in the past or will look in the future, the nature or existence of eyes at that time is irrelevant.
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I don't much care about revealing my age (except that now it would ruin my humorous comment in the previous post!). But, as a matter of principle, I don't vote on public polls. Just a pointless quirk.
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It is a public poll, so I won't be voting on principle. But ... You kids are such fun ...
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The sum of two N bit numbers will require up to N+1 bits. The product of two N bit numbers will require up to 2N bits.
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Is Space-Time a Physical Entity or a Mathematical Model?
Strange replied to question4477's topic in General Philosophy
Well, the effect of the nail hitting the hammer can ultimately be described in terms of the electromagnetic forces between the outmost surface electrons in the hammer and the nail. These are quantum effects that behave in very strange and counter-intuitive ways. So I wonder if this really is a good test of "reality". -
Is Space-Time a Physical Entity or a Mathematical Model?
Strange replied to question4477's topic in General Philosophy
Are they? They might just be a mathematical abstraction that does a good job of describing reality. -
You can look at the results of the simulation at any speed, direction, etc that you want. That says nothing about the validity of the simulation.
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I can't imagine why that would be a problem. The simulation will account for the time it takes for matter of light to travel between points being simulated. At each "tick" of the simulation clock each point can only be affected by things which are within the distance that light travels in that period. We do the same when we simulate microprocessors: we have to account for the delay from one side to the other. And that might be many times longer than the steps in the simulation. Me too.
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It is probably worth spending a bit of time (e.g. in an intro to philosophy class) understanding why it can't have an answer. After that, it becomes pretty pointless.
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Simulations like this are used all the time to check our models. The reason you can have a low cost phone with more processing power and memory than all the computers in the world a few decades ago is because we can simulate. The reason we have quieter, more efficient and safer airplanes than in the past is because of simulation. So your doubts are unfounded and, to be honest, a little silly. If it is hot and dense, then it must have dimensions. The idea of a state with no dimensions is pretty meaningless, if you ask me. As the model is based on exactly that theory, I don't see how it can be incompatible.
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Signal modulation, how much data can be set?
Strange replied to fredreload's topic in Computer Science
All circuits generated electromagnetic waves, to some extent, as noise. If you want to generate electromagnetic waves then you will need an appropriate output circuit/device. For example, a radio transmitter for radio waves, an LED for light waves, a resistor for infra red, etc. And please don't go back to your old habit of posting random irrelevant pictures in all your posts. It is very annoying and not at all helpful. -
But the sparrow only exists in your mind...
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It is useful because it confirms that that the model produces results consistent with what we observe. The simulations only produce the correct results when the right amount of cold dark matter is included, for example. This helps confirm our models of the universe.
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Are scientists arrogant, close-minded, and dismissive?
Strange replied to Strange's topic in General Philosophy
But neither of those held back the new ideas. If anything, their challenges (particularly in the case of Einstein) strengthened the theory as people analysed his arguments (e.g. Bell's Theorem). At the same time, a lot of people very quickly recognised the value of QM, GR, the bing bang model, etc. There are occasional instances of papers not getting published or someones ideas being rubbished because of influential people who didn't like them. But I am not aware of many. Eddington and Chandrasekhar comes to mind... -
How would you tell the difference?
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how does that photon know its walls with out being radiated?
Strange replied to joshuagolden00's topic in Physics
Photons are often released during fusion reactions. For example, when hydrogen is fused to helium, gamma ray photons are released. https://en.wikipedia.org/wiki/CNO_cycle But this is completely different thing to the subject of this thread. -
What is the Problem with the Transactional Interpretation
Strange replied to sethoflagos's topic in Speculations
Note that is it just an interpretation; not a different theory. So all interpretations are equally valid. https://en.wikipedia.org/wiki/Interpretations_of_quantum_mechanics -
how does that photon know its walls with out being radiated?
Strange replied to joshuagolden00's topic in Physics
You have to consider the whole system. Quantum effects are not localised. The article explains this further on: -
how does that photon know its walls with out being radiated?
Strange replied to joshuagolden00's topic in Physics
This seems to be the article: http://www.scientificamerican.com/article/cavity-quantum-electrodynamics/ -
What is the Problem with the Transactional Interpretation
Strange replied to sethoflagos's topic in Speculations
It is an interpretation. As such it is as valid as any other interpretation. Take your pick. If you like it, use it. -
I assume that when you say "the edge of our cosmos" you mean the observable universe. There is no edge to the universe as a whole. But you are basically correct. The most distant galaxies we can see are receding at more then the speed of light. The ones beyond that are (presumably) receding even faster. It is very well understood. You might want to read up on the metric expansion of space or the big bang model. This won't work. You can't have an equal pull in all directions from external mass. This was demonstrated by Isaac Newton in his shell theorem.
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Sorry, I thought I had: less time elapses on the train. In other words the train driver will have aged less than the others. https://en.wikipedia.org/wiki/Twin_paradox
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I assume you are describing the situation where the train travels from A to B. Are A and B stationary relative to one another (i.e. in the same frame of reference)? Most of the information you provide is not very relevant. Assuming the answer to that is yes, then the train starts in the same frame of reference as A, accelerates then stops back in the original frame of reference. In which case, this is exactly the twins paradox described in the video. You are mixing up two things here. Time dilation: when the train is moving at a constant speed relative to A and B, then A (and B) will see the trains clock running slow. Also, the train will see A's (and B's) clock running slow. (After taking Doppler effects into account.) Elapsed time: the train has been on a round trip from the frame of reference of A (and B) to an accelerated frame and back again. Therefore, the train will have experienced less elapsed time than A and B. Why? Because that's the way the world works. The speed of light is invariant. And this has been tested experimentally so it is not some weird science fiction idea.
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I'm not sure. But it makes it very clear that we need a theory of quantum gravity before we can understand the earliest history of the universe.