Physics

I'm an installation artist who works with social interactive concepts which point at how we affect each other, even if we never directly encounter each other. I'm working on a new piece and I have some questions about heat. I am looking for a material which a person might lie on. If they were to lie still, the warmth of their body would be imprinted for a time onto this material, and if someone else were to touch the material, even, say, ten minutes after they left, the new person would be able to feel the warmth of the other's departed body with their hand. Perhaps sharply so. Were that new person to lay on this material, they would feel warm for a time, until the …

I hear the proportion of science graduates to jobs is not good. What do people think my prospects would be if I study BA physics or astrophysics wanting to be a research scientist? I wouldn't want a job designing aeroplanes for Boeing, I'd wanna be discovering planets! Besides a degree what sort of work experience would potential research institutions want? Would I need MA/PhD? Cheerz GIAN xx

Japan is dumping tritium to the sea. Is there some use that can be of benefit for mankind ? Can it be concentrated embedded in -say glass- or concrete, or something and kept safe; perhaps retrievable if the future needs it ?

In the macroscopic world we are made of hydrogen carbon oxygen etc. But in the microscopic world of sub atomic particles,matter and anti-matter can annihilate,producing electro-magnetic radiation.According to big bang theory we only exist because there was an excess of matter over anti-matter.If there had been an equal amount of matter and anti-matter the universe would not exist. So what are we made of,(something that can both exist or not exist)?

Before I get into this, I am sorry for saying I was 'lazy' a while back. I was very tired that day and I am not a lazy person. Anyways, imagine you have a two-dimensional line that is just for measuring energy. the more negative you go; the more potential energy is stored. The more positive you go; the more kinetic energy is let out. I was just wandering if there was a way to measure the speed of the KE and PE changing (kinetic and potential). I was thinking KE+PE t (over time) but it is up to you guys to decide whether it is right or not

On page 4 of Gravitation by MTW I read, Here seems to be a mistake. Although motion, or more generally, causality is local, there exists other physics, which is non-local. This 'jump' from motion to physics seems wrong. Was such a 'jump' Einstein's mistake?

Could this concept work? because microwave oven heats x time faster. https://physicsworld.com/a/national-ignition-facilitys-ignition-milestone-sparks-fresh-push-for-laser-fusion/ It is possible that masers could be used for nuclear fusion, but there are some challenges that would need to be overcome. Masers are similar to lasers, but they emit microwaves instead of light. Microwaves have longer wavelengths and lower frequencies than light, which means that they can penetrate deeper into matter. This could be an advantage for nuclear fusion, as it would allow the masers to heat the fuel more evenly. However, masers are also less powerful t…

Does anyone know whether there would be any interesting applications if we could somehow figure out how to selectively extend the range of the Strong Force on the matter occupying a desired area? I recently finished reading a sci-fi book where a hostile alien species attacks the solar system with a probe like this. It says that they extended the range of the Strong Force from the subatomic to the molecular range, resulting in the probe being effectively indestructible (essentially it had the strength of neutronium but without the enormous mass). But I have no clue whether there’s any realism at all in the idea, even assuming that such a means of manipulating the fundament…

CPT symmetry (charge, parity, time) is at heart of modern physics: However, it seems treated seriously only in scale of Feynman diagrams with a few particles - is it still valid for macroscopic physics? Feynman diagrams of Avogadro's scale numbers of particles? In other words, if preparing CPT(initial conditions), should they lead to CPT(their evolution) ... including time reversed causality direction? While it seems technically challenging to prepare CPT(initial conditions), in theory general relativity allows to prepare T(initial conditions) - by hypothetical Klein-bottle-like wormholes ( https://en.wikipedia.org/wiki/Non-orientable_wormhole ) e…

I was thinking... if something had a strong and far enough magnetic energy, enough to pull a human, then we could use magnets to move between point A and point B. Stupid idea? Probably.

How much important physics in science?

Hi Everyone, I ended up here today while studying all the ideas that have come up about why James Webb has looked back to within 1/2 billion years of the big bang and found fully formed Galaxies that usually take longer than 1/2 billion years to form? I'll spare you all the crazy madness what that I've read going down this rabbit hole. I just want to ask something specific to this thread regarding the speed of light being invariant. Because in this article today: https://www.sciencealert.com/the-entire-universe-could-be-twice-as-old-as-we-thought they're dusting off Zwicky's tired light hypothesis. So my question is how can we be certain that the behavior of p…

What does 'emergent' mean to you in a physics context, such as spacetime?

The thought of extracting sound from objects brought up some other questions When two or more electromagnetic waves collide they mix with each other And form a result wave @ the point of collision and then they continue to go as they were before the collision right ? Is it possible that after the collision they each hold information about the collision like the place ( distance from the point of observation ) of collision or the characteristics of the other waves it had collided with ?

How do you think about it?

Does can age really stop or slow down theoretically or realistically? Is time affected by aging?

They say it is impossible to manufacture a ideal engine. First what we require is a source with a infinite thermal capacity.So to keep its temperature constant we can add external heat to it. By that way though we take heat from it its temperature will remain constant. Similarly for the sink we can use a coolant constantly to keep its temperature very low. Is it possible to do that. I am just 15 years old. So please dont mistake me if my question is ridiculous

We know that if something is fixed to the ground and we give force to it, then it will give reaction force in equal amount. How about if "something" isn't fixed, e.g. a toy truck? When we push it for an instant, does the toy truck at the same time give reaction force back to the us? Does it only give reaction back for the time they touch each other? Is my concept correct?

Hi. Please no not merge to a similar thread. A laser beam travels trough air, enters glass, then a rhodamine+ dye, changing its green wavelength to yellow : If the dye is a thin layer, should the green beam pass trough it as yellow ? Or, if the dye is 'sandwiched' between glass 'slides' , would it exit the second glass as yellow ? Will it be coherent and monochromatic ?

Good day. What is the name(s) of crystals that divide or multiply the wavelength on incident light, and light exits them at doubled (or halved) wavelength ? Any examples beyond DPSS lasers ?

It seems that a particle can be completely described by 1) mass, 2) charge 3) spin (or angular momentum) It seems that a black hole can be completely described by 1) mass, 2) charge 3) spin (or angular momentum) Is there a reason for this similarity ?

Unlike other sciences, physics can be hard to define. For instance, if we want to give other sciences definitions or short descriptions we could say this, biology is the study of squishy stuff that might smell bad, chemistry is the study of stuff that goes boom, geology is the study of rocks and stuff from the ground, astronomy is the study of the stuff that dots the sky, but what exactly is physics?

I have a question, born of necessity : I believe that simplicity should always be at the center of everything : complexity becomes a poison for intuition and truth, when it is a mental masturbation apt to feed the ego of scientists who do not seek universal truths, but elitist beliefs to feel superior regardless( or, simply, the need to feel important, which in itself is an understandable need, but not at the cost of truth and justice ); the ego must not be developed without putting truth, courage, justice, the critical and rebellious spirit, as its foundation; otherwise it will be moved by the need to lie, to omit, to adapt reality to his oasis of certainties that have n…

Neutrinos are ghostly subatomic particles existing in quantum superposition. Right now 100 billion neutrinos are passing through your thumbnail every second. 8.5 minutes ago they were in the heart of the Sun.

Hello. A helium filled mylar balloon, loses pressure as the small He atoms sieves trough any envelope, as far as I understand. Sent aloft, when the He pressure inside the balloon equals the atmospheric, the balloon stops rising, as far as I understand. At certain altitude the differential pressures of gas filling the balloon and the atmospheric outside its envelope, nearly equalizes, reducing the He leak. But there is still some weight of the balloon. Do helium balloons last much, much longer aloft at high altitudes than at low altitudes or there is a factor am not considering ?