ChrisDK

So in terms of actual measurement, how is it possible to actually figure out the value of a quantum particle, that's the thing I really can't figure out. I am somewhat familiar with the Cauchy Schwartz inequality, I believe it was in relation to vectors, but I am not familiar with the Bandwidth Theorem. Now I might be getting at this from the wrong angle, but in order to physically measure a particle, disturbing it or not, then you must be able to know exactly where it is. But if you can never know the energy and/or position at any time, how can you actually measure anything at all? Let alone watch it interact with other particles, since they suffer from the same problem (I assume)? I think one of the hardest things for me to understand as well - somewhat related - is when do these types of effects "blend" into the real world. In other words, when do things obey classical Newtonian mechanics, and when does an object obey quantum mechanics? A molecule for instance, is not a quantum object to my knowledge, as in it doesn't have the particle/wave duality, but it's made of particles that do. So when does the switch occur so to speak, is there a certain mass or number of particles in a system, that determines how an object behaves? Why don't molecules and atoms all behave like particles and waves? (Is it obvious I don't have a Ph.d in physics? lol)

Hi everyone, It's been a while since I've been on here. Last time I asked a questions about what generates gravity, and that turned out to be a very interesting discussion. Now I have a new question about particles. So, everyone knows about Heisenberg's uncertainty principle, which basically says that you can never know both the position and momentum of a particle at the same time. So by my logic (which might be off ) that means you can never exactly know where a particle is at any given time, right? So, with all the research into quantum mechanics and quantum computers, I just can't figure out how they are able to measure anything about a particle at all. Let's say I am building a quantum computer, and I want to know if a particle is in spin up, or spin down, how can you do that, when you don't/can't know exactly where the particle is? Now I realize that things in the quantum world, do not behave at all like things in the "macro world", but to my mind, that's kind of like trying to measure the speed of a car, without knowing where it is. That would more or less be impossible right? Or is it possible to decrease the uncertainty in position enough, to actually measure the particle? I hope it all makes sense

Hi everyone, I am new here, but I have a question I have been thinking about a lot. The force of gravity is one of the fundemental forces in nature. But my main question is, what actually generates the force itself? Now I know of course that gravity is proportional to the mass of an object, but that must mean that every atom on it's own, generates a very tiny amount of gravitational force - right? So is it the nucleus, electrons, quarks, the charge of the atom or something entirely different that actually generates the force? All the research I have been able to find about gravity, never really covers the subject of the force itself, but rather more it's effect on objects. But why does mass attract other things in the first place? Do any of you have any clue about this, or does anyone even know? I hope the question makes sense