Physics

From what I have heard that is the time in the model approaches infinite density. Is there anything that would distinguish this universe from any other possible one? Is any asymmetry involved? Do quantum processes dominate for something as small as that ?(I don't know how small that actually is)

I wonder if we could re-create a form of static electricity but stronger version (and hopefully safe too) of it for use onboard spacecraft and space station. I can picture mentally of an electricity that could flow through object(s) with mass then when that occur so, the object mass gain energy temporarily at a given time as long electricity flows through then surely sub-sequentially yield a stronger gravitational attraction. I imagine would have to make objects whose density have to accompany dense geometry in order to accommodate extra energy. But I'm not sure about objects' (e.g. which ore material etc) sustainability or endurance could / would be (e.g. lead to de…

Hello. Typical 12V lead-acid batteries eventually die because one of the six 2Volt cells becomes short-circuited and so far, there is no way to repair that. Happened to me last month on -20C days. The then-healthy battery was under trickle charge and when attempted to start, 10volts!, barely cranking. One shorted cell... garbage... replace with new. Question is, the short circuit dissipates a considerable amount of energy internally, damaging (or thawing!) something. But never heard of that happening. Why ? Where that one-sixth of the energy stored in the battery go ?

The thinking occurs to me as this: The more shared mass objects (e.g. iron etc inside core) happen due to electromagnetism, would if high amount of that temperature melt iron etc in core resulting in core gravity?

Hi, I ask this because it seems to me that randomness doesn't exist, I don't know what science/scientists think about this, and sorry for not having searched Google before posting E.g., when you throw dices, I believe 0% of the result is based on randomness, I believe 100% of the result has reasons, such as maybe the way the dices have been thrown, maybe the temperature of the room, the distance to the impact surface, its density... Is there some experiment that proves randomness exists?

Can cold water be used to melt frozen water pipes in your home?

Can you think of black holes as infinite potential wells?

Hello. A coil with a laminated iron core, put to spin... Would it generate some electric current in its windings just because the faint earth magnetism is in the way ? -No permanent magnets involved-

This is with reference to the following recent short video by Sabine Hossenfelder: I must say that, while I don’t necessarily share all of her pessimism, I do find myself agreeing to some of what she says here. My problem though is that I have never myself worked in professional academia, and have only a peripheral awareness of how exactly funding, the “paper mill” etc work when it comes to research in the foundations of physics. I also haven’t read her book Lost in Maths. I am thus curious to hear from those on this forum who do work in professional academia - what do you think about her comments? Is there any merit in the notion that there are systemic is…

Greetings... You have a chunk of plutonium on your desk 🤥. What is the danger ? Is it its thermal emission; its electromagnetic radiowaves emission; other invisible emission; its dust particles emission; poisoning ionizing emission of (α),(β),(γ) rays ? What gets ionized nearby in its presence ? -The word radioactive confused with radiowaves to the public- If that chunk of plutonium on your desk is small as a grain of salt or larger as a golf ball, will it harm you slower or faster ? If that chunk of Pu is embedded in a plexiglas block; does it change anything ? 🤨

I was looking at a time clock, then I have had a thought about what if were to add a box or container with some water and floating object underneath it. The line connection between the floating object and the time clock. If gravitational influence affect the floating object at some levels, the floating object would tug or pull the tick pointer to move either speed up or slow down depending, yielding a possible and more accurate local time? The reasoning I follow is if more accurate local time, then less the need to adjust local time multiple of times or something like that. Or is my reasoning wrong or need a bit more learning about GR or SR or both? I have attac…

ABS plastic case provides some kind of protection against accidental hand shocks and tabletop case for 2.5" HDD hard drives? I know that HDDs have a mechanical needle and arm, some types of knocks or shocks scratch the magnetic disk

hi, my name is Chris but please call me DJ UBER FUNK MASTER FRESH.. kidding im from the french part of Canada... so you can hate me all you like... please forgive me if my English isn't UK perfect i currently reside in the archipeligo of the Philippines to be closer to my daughter...... my question is as follows, is all energy, resource driven ??? to physically move my maple syrup flavoured butt i need calories.. food, to propel any vehicle i have forward, i need petrol, electricity or peanut oil (diesel) to get electricity, we either need coal, heavy oil, uranium... ... as for solar power, we need that big ball of fire in the sky and that i believe is…

The promise is a small device, which can be connected to a smart phone, and register, identify, display graphically (spectrum and in intensity in time; also on Google Street Maps or Open Street Maps), radioactive substances, better (and cheaper!) than traditional Geiger-Müller counters. Here is their website. Here is a report of a physicist playing around with it. Some excerpts: I always like to measure things around me: where am I and how high (GPS), what is the temperature, moisture of the air, water temperature of the lake near my house, and on and on. Maybe I am a bit nerdy...

Hi. On a recent thread about microwaving steam, a graph posted has this portion : Is the word vapour valid only for the pink area left of the vertical red line by 100C ? and steam the correct word for the area at right of that vertical red line by 100C ? If I leave a glass of water under my bed for a couple of weeks; it will be dry. Water turned to vapour, was never exposed to over 100C. If the same glass of water was exposed to over 100C, it turned to steam, not vapour. Am I wrong ? Or should the graph say GAS instead; that depending on temperature it can be vapour or steam ?

Hi, I mean whether we could interfere them via setting their amplitude and/or wavelenght quantities by functions' rules. for instance, are the amplitude or wavelength of waves' are settable in the conformity of f(x)= Ax +B (This is a general rule of linear function as you know) Thanks.

Hello, guys. Me and my friend (I used to had a blog about cosmos, he is an astronomy student at very end) are fascinated by science so we started to write a book about different, strange or creative science questions that we will answer (mostly astronomy/physics/thought experiments). We decided to ask community here for ideas of these questions - what you would like to know, what intrigues you, what is interesting, what can sound fun. We have about ~40 questions for now, for example "what will happen when Sun disappears", "what will happen when you jump into a tunnel through Earth", "can Jupiter became a star", "how universe can end", "why teleportation is so problematic"…

I've been reading a 2023-2024 Flash Comics storyline "Dawn of DC": 'Siege of Stillness'-'Flash in The Hand' and these story-arcs are employing three quantum effects, some having been known for around one hundred years as the Koppenhagen Interpretation. Anyway there are three older superpowers, two of which the Flash already had and one in which his son has, described in a more modern way. The two powers the Flash uses are phasing through solids, and creating an Alcubierre Warp Bubble around his person in order to achieve superspeed. The third power of his son is teleportation. These are known ?s in physics that have words put on them like "Neutrino", or "Dark Energy…

https://globalnews.ca/news/8851556/apple-lawsuit-amber-alert-hearing-damage/ https://www.pacermonitor.com/public/case/44560022/Gordoa_et_al_v_Apple,_Inc_et_al I did some Googling, and the maximum output physically possible for Airpods is 100-105 decibels when in the ear. So if they're playing a sound at maximum volume, the maximum decibels their eardrums could be exposed to is 100-105 decibels. Apparently, the family waited two years before filing the lawsuit, but I can't find a source for this as of now, it was a comment made on Reddit. Is 100-105 decibels enough to instantly rupture a person's eardrum and immediately cause permanent hearing damage as the …

Hello all. A tiny air pump as in a fish tank 'undergravel tank filter' feeds air into the smaller diameter hose on top (images) and the bubbles created at bottom lift the water in the larger pipe, working as a circulation pump with bottom suction, top discharge. Is there a limit of water lift height with this bubbling method ? What determines the limit ? The gap between bubbles, flow of bubbles, size of bubbles, diameter of tube ? All interacting ? It is a cousin of the Venturi principle ? The depth at which the bubbles start is irrelevant if deep or shallow, right ? I can guess/visualize a looong tube carrying water very high just by the up-flo…

I consider the subject of this thread of high priority in Physics because it profound implications in both the theoretical areas as in the applications in the practical areas. It must be analyzed by real physicists (not an Electric Engineer as I am) and channelized in Physics Science in the appropriated way. The problem is in the formulation of the 2nd Newton's law. It is found that the real equation of force is F= ma and not F = dp/dt even for thee case of variable mass. I have already begun to treat the problem threads here at the SFN forum in 2019 and in 2023: A new evidence surged from the reference of a book published by Dr. Cowan (London University). The …

HI, I wondered if anyone could help me please. I am being hit in my home by some kind of radio frequency/microwave radiation. Its been going on for over a year and i believe is the cause for various health issues i now have. I purchased a Acoustimeter AM-11 RF Meter and its picks up a reading of anything from 30 to over 100 microWatts per square meter every 10 minutes. (sometimes it can go even higher) The reading lasts for about 2 seconds but its happens every 10 minutes at the exact same time. Due to health issues i am unable to leave my house much so am under constant "attack" Can anyone tell me if this would be dangerous to my health and if it could be…

Hello guys, I am attaching an exercise and the the given answer. I have two questions regarding the answer. There is one more force on the cylinder that creates an anticlockwise torque about its center of mass, and this is the component of its weight that is in the direction of the surface (pointing down the slope). Why didn't the exercise consider that force for the overall torque, as well? As per the answer: each side of the coil exerts a magnetic force Fm = NBil. But this is the equation regarding a magnetic force's magnitude on a wire only in case that the magnetic force and the wire are perpendicular to one another, which here is not th…

I believe heat is one of the greatest losses of kinetic energy. For instance, whenever energy is transferred some is lost in the form of heat. Take for instance when you fire a gun, when you pull the trigger it causes a hammer or pin to strike the primer which sets off the propellant. The propellant is the source of the gun's power. When the propellant is set off it burns and expands, releasing kinetic energy which forces the bullet out of the cartridge, down the barrel and out the muzzle. However, at the same time tremendous heat is produced which is why guns get hot when you fire them. Same thing with cars, a car works by the gasoline being ignited in the cylinder which…