Physics

Found this article http://www.bbc.com/news/science-environment-28543990 There is also this article with heaps of math http://www.nature.com/ncomms/2014/140729/ncomms5492/full/ncomms5492.html About Schrodinger's cat Glimpsing this Cheshire Cat requires what quantum physicists call "weak measurement," whereby you interact with a system so gently that you avoid collapsing it from a quantum state to a classical one. Now according to Schrodinger's cat any measurement should collapse the quantum state.

From what I learned in Physics class energy is "the ability to work". So in other words energy is the force behind motion. Without energy everything would be 100% static. In order for matter to move, there must be energy to move it. But what exactly IS energy? Does it have a physical existence? Is it just a type of matter? If energy isn't a physical, tangible substance then how does it exist? Any theories or ideas?

Thanks Swansont. Could you just clarify this please. Is "light" an actual "thing", or just a human-invented collective noun for lots of photons? 1

When I was young, my parents told me never to run when there's a thunderstorm, because running increases one's chances of being struck by lightning. I know that standing out in the open makes you an easy target for lightning... but what about running? Did me or my parents misunderstand physics back then, or get this out of some superstition? Or does changing your velocity, or having a velocity in relationship to the clouds, make you more likely to be hit by lightning than standing still?

modern definition of metre

I got this advertisement, or rather this advert. got me in Facebook This website is selling colour blind correction glasses. It has a links to white papers, news channels, Discovery channel. Why and how does it work, and how would you go about checking this? http://o2amp.com/

Hi everyone Didn't really know where to put this; physics or biology... Let's imagine an organism (human) with a mass of 80 kg. My primary question: can an organism with mass m deliver a pressure greater than its mass? I'm sorry, but I really can't explain my question better and since pressure is dependent on force and area, I don't really know if this question is even correct. So let's define a 'pressure' expressed in kg. Can the man deliver a pressure greater than 80 kg? At first sight: yes. Imagine him standing underneath a door opening and pushing with his arms again the door post, thus the force on the ground (his supporting surface) is (much) gr…

science is about predicting physical behavior? Say, how would a planet's atmosphere be affected if it had no more heat source, like a sun for example.. Or say, if all the water on planet "a" rose to a level of 0.0006 nano meters, how would that effect orbital periods of its moons.. Or, if water reached 1/2 of its boiling point and you placed " some substance" in it how would that substance's atomic structure behave and or respond, if the water's boiling maximum was instantaneous?? These are just examples...

Hello!)) I am 19 and seeking help with self learning physics (and indirectly math) through to a theoretical level, and basically would like help in making a list of course material that I would need to go through to accomplish this. I do not want to go through a formal education route due to monetary concerns and would much rather just know this level of physics for the sake of knowing it and perhaps applying it to a few expirements. My current level of mathematical education is through Ordinary Diff Eq with light knowledge of PDE, I feel like it would be best to brush up on ODEs as I can be a bit hazy at times on it, I have taken a course in Statics, classical mechanics…

Hi. Instead of flame powered, an electric heating element. How does it compare to a plain AC household electric refrigerator, say one that consumes 250 Watts x 16 hours every day. (4000 Watthour) A 250 watt heating element attached to an absorption refrigerator, would have a reasonable household performance ?

Hey I am a new member here at the science forum! I recently have been doing some research on optics and started experimenting with laser lights. I started to place mirrors around my room and reflecting laser beams off of them. After a while of just random experimenting, a thought came into my head. What would happen if I could collect light from the sun using a mirror that would reflect the light at one point? I researched this topic and found out about parabolic reflectors and parabolic troughs. So if I were to concentrate sunlight at one focus, which would be better (in terms of more heat): a parabolic reflector (like a bowl shape), or a parabolic trough?

i searched about it and saw video but i can't get right idea what is the advantage of Quantum computer than normal computer

Correct me if I'm wrong, but the common conception of the reality of gravity is that all objects that have mass/density generate an attraction. Objects of higher density/mass will have more attraction than objects of smaller density/mass but every object of density/mass does exert attraction. There are considered three other forces attributed to the cause of motion. The strong force (the reason for atomic particle motion), weak force (the reason for radiation) and electro-magnetism. Gluons, Bosons and Photons are said to be the particles that carry the force that explain the strong,weak and electro-magnetic forces. I understand there is a thought that it wil…

Hi Forum, I am looking at investing in this company: HYSR http://www.hypersolar.com./ From the website: Self-contained Photoelectrochemical Nanosystem — Our low cost nano-size particle technology is designed to mimic photosynthesis and contains a solar absorber that generates electrons from sunlight, as well as integrated cathode and anode areas to readily split water and transfer those electrons to the molecular bonds of hydrogen. Unlike solar panels or wind turbines that produce a sizeable number of electrons that will be lost before reaching the hydrogen bonds, our nanoparticles are optimized at the nano-level to ensure maximal electron generation and util…

Hi everyone Here's one for my entrance exam for med school: "A man with a mass of m kg walks up three stairs with height h. The work delivered by the gravity is then?" I'd say -3mgh, but the correct answer is -mgh. Can someone please explain why? Thanks.

While determining the existence of Euler cycle (going once through each edge) for given graph is trivial, for Hamilton path (going once through each vertex) it is NP-complete problem (e.g. worth a million dollar). Denoting adjacency matrix of this graph by [math]A[/math] and its number of vertices by [math]n[/math], diagonal elements of [math]A^n[/math] count also eventual Hamilton cycles – the problem is that they also count other length n cycles – going more than once through some vertex. The question is if we could somehow "subtract" those going multiple times through some vertex ... Grassman variables (anticommuting), used in physics to work on fermions, seem to be p…

The electric field isn't real. It's just something some guy (Michael Faraday) made up to make it easier to think about the universe. http://physics.info/electric-field/ I was not sure of this was true, but it kinda makes sense??????? So what now do we do??? I am thinking that most formulas for electrical engineering are a waste of time coupled with so many others too. Can these be upgraded ? This is really annoying and confusing, it seems now something is also leading to unresolved issues, How can we invest so much time in science research when we deal with news like this most of the time?

Is this true?? How then do aspiring scientist, such as aspiring musicians, song writers and etc, get recognized for their work??? Yes I look at science as an art form, and I do copyright all of my work regardless, I even have it notarized..

This is a little thing I've been idly wondering about; We usually know at what velocity a solid object must hit another to deal damage. It's also easy to tell at which speed hitting the water could harm a person, making diving from excessive heights potentially dangerous. But what about air? At what velocity would an air current be powerful enough to break a solid object by itself, or even hurt a person? Can anything on Earth generate a current strong enough to wound someone for instance? What's the highest damage air itself was ever known to cause? Note that I'm not talking about air currents that indirectly cause damage... such as the wind picking up a wooden pl…

Wasn't sure where to put this But how many joules of force are in 1 Ton?

The intention of this post is not a speculation, its an ideal I wish to test out. So I don't want replies based on speculation or personal theories. Now here is the Cosmic inventory http://arxiv.org/pdf/astro-ph/0406095v2.pdf "The Cosmic energy inventory" The one value missing from this inventory is the energy contribution of the Higg's field itself. So I wish to use the Bose-Einstein statistics, based on the only confirmed Higg's Boson we have confirmed (reasonably). As the Higg's particle is a boson this statistic should work, for fermions we use the fermi-dirac statistics. The purpose of this research is to see if I can further constrain the cosmol…

Hello, Just watched "Did God Create the Universe?" With Stephen Hawking. The conclusion left me baffled. It seems they or he concluded that because the Universe's negative space and mater together would = zero and that because the fact in quantum mechanics protons can appear out of nowhere and disappear for moments in time proves the Universes matter could have just appeared rules out the possibility of a creator? To me I did't think that would have been the conclusion. Something has to trigger the protons to disappear and reappear right? So wouldn't something have to trigger the start when there was no time or space or matter? Also who or what or why for lack of a bet…

Assuming you had a power supply, a switch and a capacitor in series (no resistor and the wires/power supply have no resistance), would the capacitor charge instantaneously when you closed the switch (because the P.D. across the capacitor would become equal to the P.D. of the supply right away, I think)? The time constant, as far as I'm aware, would be = 0 seconds for this case. What would then happen if the switch was opened? NOTE: by 'instantaneous', I mean the rate of charge/discharge is only limited by the speed at which electric fields can propagate through space etc.

What are everyone's thoughts on the book "A Universe From Nothing" by Lawrence Krauss? What do you think about the rebuttal in the New York Times? http://www.nytimes.com/2012/03/25/books/review/a-universe-from-nothing-by-lawrence-m-krauss.html?_r=0

collision of hadrons, but what is it hadron ?