Physics

The basic premise proceeds from the assumption that the probability of a world coming into existence exactly like our own is greater than zero (we know this because our world exists). If space is infinite, then cosmology tells us that our existence will recur an infinite number of times. We also know for a fact that we are made of atoms and particles. Giving infinite time and space, there will eventually be same atoms and particles IN SAME ORDER, therefore our existence is cyclical and not linear. Speaking of logic, the only reasonable answer would be that we indeed are living in an eternal and infinite space, where big bangs are occurring infinitely without need for ca…

Antimatter (Positron or Antiproton annihilation method) annihilation propulsion systems are being researched by scientists nowadays, but I wonder could it used on Earth.

I learned that in chemistry that when a unstable element is going through Beta decay, a neutron splits into a proton and electron, the electron being the Beta particle. As far as I know, the protons and neutrons are made up of quarks, which are elementary particles. The electron is also a elementary particle. But how do both quarks and electrons make up an atom? I did some research, and was unable to find a good explanation for this. Could some one please explain? Thanks in advance.

Woaw. Doesn't that description fits with the Chelyabinsk meteor explosion?

A friend of mine asked me a question about something scientific during lunch, as he knows I am scientific. He asked," If a napkin (just a cheap, cloth napkin) moves at the speed of light and hits a wall, would the wall break?" Now, and this is assuming that the napkin is a few meters away, my answer would be no. The speed of light is around 299,792,458 meters per second (info via Wikipedia). a napkin would not even hit the wall at those speeds, due to the pressure being to high, and would rip the napkin in half. I am able to rip a napkin in half with extremes ease, exerting little force. But the force exerted from the speed of light is far greater, so clearly it would rip…

[note: Hey moderators, I'm not sure whether to post this under here (homework help) or physics section.. which is exactly appropriate for this kind of post? I'm not student, but I'm self-teaching (non-formal education) to learn physics for time being.] Location of Atoms 1. "Everything is made of atoms" sentence was mentioned on the 11th paragraph, 1-4 chemical reactions. So does that mean the universe is 100% fully made of atoms which are evenly located and "distributed" in every directions (although not in a perfect matrix structure order).. there is no such as absolutely empty vacuum space, devoid of atoms? Shape Definitions on Atoms 2. Are all ki…

I think most people (including myself) have a very poor understanding of magnetism. We mostly understand that opposite poles attract and like poles repel, but that is where the intuition ends. I have proposed an experiment to deepen out understanding of magnetism. The experiment holds two magnets N-S at a fixed distance L apart in lets say air. We then measure the force of attraction. The magnets are then lowered into a medium with a higher permeability than the first, such as molten iron (joke but cant think of anything else) and measures the force of attraction. Lord wikipedia tells us that this will indeed increase the force: But the phenomeno…

It may baffle to some extent for those of you who know me may recognise me as a possible philosopher. But seriously, I just need to ask these questions: -What do you call a theory that cannot be proven, sounds illogical, neither can it be disproven? -Is everything phenomenal due to the limitation of science? -Due to the limitation of science, and the infinite possibilities to the universe, are our experiments, theories, conjectures, assumptions, so on, so forth, wrong; because of the undiscovered portions of the possible infinite universe?

One of the key things, to know on how to predict the future is the mechanism, we would use to do so. Let’s consider an example of predicting something basic. Let’s say, I want to predict what is the result of (2+2) for that, we may use a calculator, or a computing device or our brain itself… but, what we’re goanna do, in order to predict this simple calculation is that we would introduce a faster computing device, which is performing that same calculation, and put the result before than slower calculator (or any other device). But, for predicting our future, we need to simulate everything that has happened after the beginning of the universe, up to the present, and…

Satellite phones are rugged and used for businessmen going on safari for the most part, and run about the same as a regular cellular communications phone. Why are there not any companies seeking to integrate satellite communication phones in the same fashion that cells are today, technologically and economically (i.e. touch screens, contracts)? Are there any difficulties in infrastructure or ability that are limiting in this development?

Particle collider mostly use electron-electron or nucleus-nucleus for there experiment. There is a conservation law about the electric charge. Does these experiments are biased by using particle with the same electric charge ? For example if you collide proton with proton the result should be mostly positive charged particle. Just a thought...

Looking for recommended articles covering how the Pati-Salam integrates into the SO(10) model. In particular covering the orthogonal group integration. I've found numerous articles on each seperately but would like to study the integration. http://en.m.wikipedia.org/wiki/Pati%E2%80%93Salam_model http://en.m.wikipedia.org/wiki/SO(10)_(physics) The second link has it in a subgroup Most likely the details I'm looking for is articles giving a better understanding on the Pati-Salam left and right hand symmetry Just a side note if anyone knows of any good papers on Pati-Salam with regards to diquarks (if any, please add that as well) http://en.m.wikipedia.or…

Goiânia accident "one of the world's worst radiological incidents". Scavengers found device with radioactive source in abandoned hospital, and significantly contaminated 249 people, 4 dead. Mostly scrapyard owner family. http://en.wikipedia.org/wiki/Goiânia_accident "While the serial number of the device was unknown, thus hindering definitive identification" Unbelievable. Now every such device should have GPS included..

Space is determined as empty but that's judged based upon human opinions but is their nothing?? or is there gases or certain particles that our equipment just aren't advanced enough to trace??

Hi. Is it called the same in the filter industry: 'filter' ; and there is need to specify blocking or passing for a particular wavelength ? Example; am after a filter that will not pass wavelenght of 450nm and lower. Should I say 450nm and lower wavelenght blocking filter, or 450nm and above wavelenght passing filter ? Are Wratten filters waterproof ? If I choose a Wratten #4, does it mean it will be gelatin or should I specify glass ? If glass, does it mean there is a layer on its surface, or the glass material itself is dyed-embedded with the filtering properties ? Are Wratten filters useable, better or worse to make laser blocking protection goggles…

This is a quote from a NY Times article about slefhandicapping: Does anyone happen to know what exactly recent research has shown about who is prone to it? It isn't explained in the rest of the article. For those who may not know what selfhandicapping is, its a method of protecting your ego and selfesteem by producing an excuse for your performance on some test, like, suppose you were to have an IQ test scheduled, so you don't sleep the night before, or you get drunk the night before just so you can say that your score was negatively impacted. That's an example, but it can be any way of concocting a reason as to why the result of the test doesn't reflect on y…

I would like to know if my understanding of capacitors is correct. a) If you move the plate of a charged hypothetical capacitor further apart from each other the voltage must increase since V = Q/C and C = εA/d. The stored energy E = 1/2CV² increases because V² increases faster then the capacitance C drops. My understanding is that this energy rise strictly comes from the mechanical energy from the lateral pull. b) If one would insert a dielectric with an εr of 2 into an unconnected and charged air plate capacitor εr of 1, capacitance would obviously double. There's however no conversion of energy (At least that's my line of thought) since the work done is at a …

Hi, I have a practice problem in thermo that I have some difficulties with: The PVT relation for helium is given by the following equation of state: P=RT/V-b, where b=2.3*10^5 m^3/mol Through an isenthalpic (H=0) throttling process, the gas is let to expand from a pressure of 10^8 Pa at 300 K to a pressure of 10^5 Pa. Calculate the final temperature of the gas. Cp can be considered constant at a value of 5/2R. I started by using the eq. for enthalpy dH=0=CpdT + (V-T(dV/dT))dP and finding (dV/dT) from the PVT relation given which resulting in R/P Replacing R/P in the dH eq. we get: 0=CpdT + (V-T(R/P))dP Wouldn't this cancel the dP term since TR/P =V? Or should I…

Hello all! I am new to the forum, so sorry if I post this into a wrong place. So I have been wondering about what if you would drop a coin, for instance off a building that is 400 meters tall, what would be its velocity when it hits the ground given the acceleration of 9.6 m/s^2 due to gravity. I have seen an other topic about the same problem, but it didn't help me at all. Can somebody please help me? Thank you!

On a Mendocino Motor why does one side float free while the other has a tip to a wall? I know the question might sound trivial but I have worked up the idea why not use the same magnets used to levitate as a counter force on both sides of the shaft? I attached a very rough jpg of what I mean. the green magnets at the end of the shafts is what im referring to. is there some theory or law preventing this?

I've had this idea for a while now is it possible to achieve? It's based on the diaphragms in microphones and how they produce weak currents, what if we put huge number of these mics in stadiums and concert halls and connect them with each other's while rectifying the current then amplifying it using transistors?

Hello everybody help me plz i have a research on " temperature dependence of blood surface tension " I tried to find any thing about it and i didn't plz help me with any references , names of books , Pdfs , anything thank you

I've this idea, assuming the universe continues to go on expanding at an accelerating rate forever. It is possible for virtual particles(VP) to come into existence, they however need to borrow energy or mass, from another part of the universe, during accelerated expansion, there comes a time when every point in space expanding at a rate (faster than the speed of light) which means every point is seperated from every other by an event horizon. VPs, which are particle/antiparticle pairs will be seperated by this event horizon and cannot annihilate to return the energy back. So the universe can lose energy, but gain mass, as follows the equation E=mc^2. Considering the ene…

What particles can have strong interaction? What particles can't have strong interaction?