Physics

Does there exist any physical equation where time is not a variable, this obviously includes any derivatives. Also I'll tighten the parameters a little such that anything involving EM waves are a function of time (such that 1 cycle from any wave is the shortest unit of moment) Secondly, quantum mechanics is disqualified, mainly due to the fact i have little comprehension of it, However feel free to write an QM equation that also doesnt have a derivative in time. Regards. As a side topic, i just realised there are plenty of equations regarding force and energy. Force refers to motion which atleast has a term of time. Energy i suppose is unique howe…

When people talk about "Physics" I dont think most people are really ever on the same page. There is physics related to stuff like motion, and movement of physical objects. Which can often be applied to engineering and mechanic degrees. While there is also nucluer and Astro physics. However I think when most people hear "Physics" they think of space. While physics often makes me think of the laws of motion.

I was just thinking, can number zero describe a physical quantity of an object or is it more correct to say that the object doesn't possess that quality? For example, what is more correct: a) neutron has a zero electrical charge or b) neutron doesn't have electrical charge? On one hand, since we can't quantify the value of it's charge, it doesn't have it. Period. On the other hand, neutron is the result of three quarks coming together and they do have charges and the sum of those is 0. In this case it would be rather strange that three entities that possess this quality will combine to form another entity that doesn't. I'm confused.

1-does air reflect better when there isn't humidity? 2-Some organism can see smaller waves of light then us... can i now which organism can do it? 3-how does projector works? thank you

What metals can stand being rapidly heated to "cherry red" and then withstand being cherry red while still keeping it's strength intact over long periods of time of constant re-heating and cooling? The metal would need a fairly quick re-cool time as well as be fairly light.

Can anyone help please I drive a car that weighs 1000kg, I hit the car in front that weighs 3000 kg. How far would the car in front move if I hit it at 30 mph, 40mph and 50mph. Thank you

As we all know we can see because of light ... So we CAN be invisible A) If light go through your body ,so no one can see you .. B) if you can absorbe light .(just assume!!) Let's think A) is possible then you can not see by yourself 'coz if u let the light go throught your body then light also passes through your eyes without reflecting ... So The whole world is blind to you ,and you are blind to the world!!! and about B) how can single person become a Black hole!!! My question is tell me if there any other possibility to become Invisible without becoming Blind..

Hi! I have to make a project called Minkowski space and i don't know exactly what should include in. It's very complicated what i've founded about Minkowski space on google and it's beyond my means...could you suggest me what should i refer to?? some ideas?? and i want to know if there are practical applications of Minkowski space and also why is it important..

Other field and waves of either part .. Electric or Magnetic form aggregate or net effects .. while Light doesn't seem to (significantly) share this behavior (AFAIK). Why? - - - A bit more to explain this concept I'm curious about. Put multiple magnetic sources near each other .. they interact and form a net or aggregate single Magnetic effect .. Same thing with multiple electric sources ... the result is a net or aggregate effect. The Electronic and Magnetic fields of the electro-magnetic wave of light seem to (mostly) not exhibit this behavior to any significant degree .. AFAIK... Multiple light waves in the same region don't form a net or aggregate …

Two instances were discussed in the film where unmanned cargo ships were mentioned to send up supplies to extend the time Whatney or the crew of the Hermes could survive. This brought back painful memories while watching the movie. It's such an obvious answer. In the space shuttle Columbia disaster NASA rejected a possible rescue because Atlantis could not be readied in time within the 16 days the Columbia's supplies would run out. So since "nothing could be done anyway" there was no need to do accurate imaging to even find out if the wing damage was survivable. Note in the movie they had to use China to do the resupply mission to the Hermes. If NASA had ordered the Co…

I was reading about a "new" fusion reactor design called the stellarator http://news.sciencemag.org/physics/2015/10/feature-bizarre-reactor-might-save-nuclear-fusion And I began to consider possible environmental impacts of using fusion as earth's primary power source. At first I wondered, since deuterium would need to be extracted from sea water if this reduction in water would effect us majorly. But research led me to find that fusion requires very little fuel, the ocean is roughly only 1/4000th deuterium, and that at 1995 levels of energy use it would take 160 billion years to use up. However I couldn't find the answer to the related questions: How m…

Hey all! I'm a Biomedical Engineering student but I love Maths, Physics and Philosophy too. My knowledge about higher physics is very limited though, so I wanted to ask a few questions and see if I can get closer to the truth If I am correct, the Big Bang is the name we give to the events that created the world we live in. Before that, all space time and matter was condensed in a unstable singularity that some quantum fluctuation caused to explode. My question begins here: If in the exact instant before the Big Bang, neither space time nor matter existed - just a giant singularity, how can it fluctuate, given that force carrier particles exist within space time? How…

I was wondering after reading a Dean Keith Simonton article about geniuses http://izt.ciens.ucv.ve/ecologia/Archivos/ECO_POB%202013/ECOPO1_2013/Simonton%202013.pdf if Nobel Prize is to blame because science it became a trend, fancy. And people who can have ideas are rejected. What you think ?

I work in temporary traffic management, we use stands and bases to support our signs which look like these http://www.trafficmanagementltd.co.nz/store/3/145/Sign-Stand-Base A problem we frequently encounter is that the wind blows over the sign, so to counteract this we place a sandbag on the feet of the base. My question is, where is the best place to put the sandbag to minimisee the chance of the sign blowing over? At first thought I chose the very end of a foot, because it is the maximum distance from the fulcrum and therefore provides maximum downward force countering the wind. But when thinking that through, the wind would conversely have the best leverage…

Hi, I may have a complete misunderstanding of this topic, so I apologize in advance if I sound like a complete idiot misunderstanding the subject matter. So here's my question. The idea as I understand it is, that if a space ship moves at, or very near the speed of light for 1 light year then everyone on earth ages at a much faster rate. I found an online calculator at http://keisan.casio.com/exec/system/1224059993which states that (if I used it correctly) that if you travel for 1 year at the speed of light, then 57.2 years will have passed on earth. This makes no sense to me because to achieve this effect you must be moving a person at the speed of light…

Hi guys, Another question I'm afraid. Now obviously gravity is one of natures mysteries we don't understand it, and can't magically generate it's effects. What I'm interested in centrifugal force and simulating gravity using that. From what I understand however, the size of the rotating section is quite important. If you have a small spinning ring, then the force at a persons head will be less then the force experienced at their feet. Making hard to move and disorientating. What radius would a ring need to be to provide the feeling on earth gravity while avoiding the sensation of different levels at different heights of your body from the outer ring? At wh…

What kind of force in the gravitation is any realation with magnetism ? can we create artificial anti gravitation on earth any possibilities???

Are there any experiments constructed for detecting vacuum energy ? What role the vacuum energy have ? and how it interacts with matter ?

Hey, I'm doing a assignment for school and the question is "does the density of a liquid affect refraction" Im using a glass jar with various liquids and a laser point as the light although no matter what liquid i use the light stays straight all the way thru and out the otherside. Am i doing something wrong or does the density not affect refraction

Hello everybody, i have seen those art today, to be honest it looks so funny haha, But can you see some of them become real ? Enjoy it What a beautiful day! A collection of vehicles that the people of our past predicted being in production one day. France in the Year 2000 (XXI century) – a series of futuristic pictures by Jean-Marc Côté and other artists issued in France in 1899, 1900, 1901 and 1910. An issue of Everyday Science and Mechanics from 1935 promised: 'It has proved possible to photograph books, and throw them on a screen for examination, as illustrated long ago in this magazine. https://www.youtube.com/watch?v=D5uaJDrvZXc

What does make the Earth be orbiting the Sun? Would there be a way to change Earth's orbit?

Okay so i just read an interesting article on a new superconductor that acts as an insulator, superconductor, metal and magnet aswell as having a very low critical temprature. Now i started investigating exactly what this means, its all very counter intuitive. Im presuming these properties exist in different conditions. The article got me reading into these various properties and i eventually got confused with some of the basic stuff. For example if a super conductor has no resistence at all then ohms law no longer works? Its also got me confused as to the exact nature of volts and amps as i interpreted them. So it took me back to some of my roots in elecrics, sp…

I have a degree in biotechnology. I run assays, do research, I'm a lab technician. Most people in my field will generally do this for a living. What do people with bachelors in physics do for a living? I like to think they do the following: -Do research at a university/company -some kind of programmer? -Teaching Assistant -Tutor -teach (some where) ~is this right? ~EE

Hi. A space probe/craft traveling at very high speed, in need to slow-down or land on a remote destination, has to waste its energy or is there a method that can recover some of it and store it for later takeoff or whatever energy consuming actions needed ?

The new edition of the free physics text in pdf format is now online at http://www.motionmountain.net The new edition includes many new topics, pictures, puzzles and tables; it keeps the promise to be fascinating and challenging on every page. The text now explains the geometric phase and its uses in optics, the limited, three-dimensional colour space of humans, how artists use it, and the twelve-dimensional colour space of mantis shrimps, the fascinating physics of the human voice, the singing of high-voltage lines, the knots possible in Maxwell's equations, and the reasons not take Descartes' philosophy seriously, following his own advice, because of the finiteness o…