Physics

Why do pieces of a broken mirror behaves as an individual mirror when pieces are joined together by simply putting them together or by any adhesive , and not as single one ?

Basically what I'm asking is if their is an observable amount of gas in space, is their still a separation of its temperature, heat, or density?

The picture itself is insensitive, but if you wish to look at the original, it is here: http://www.funnyjunk.com/funny_pictures/4815941/So+that+s+what+he+was+thinking/ For those who want to click on the link, it is a joke involving some aspect of the Aurora Massacre. I don't especially like jokes about murders, but seeing as the joke is based in what I believe is physics (I am a student; I recognized several equations, namely kinetic energy, in the picture, but few else.), and, seeing as I am not a master of physics, nor are many frequenters of the site, I did not understand it. Here is a transcription (or at least as close as I can come) of the text: Okay, nevermi…

Hi. Most can only see two Images here, a few can see the secrets embedded...

This time im curious (confused) at how EM waves convert (relate) to other forces in engineering and physics. For example how much "Energy" does a transmitter emitting radio waves for satellite TV have in terms of firstly Energy in GR terms but also into other forces such as kinetic or sound?? Im mostly confused with [math]e=mc^2[/math] because photons seems to move at c but carry no mass, meaning, to my assumption, they also dont equate to an energy? ( [math]0 * C^2 = 0 [/math]) Also if you rearrange [math]e=mc^2[/math] equation so that we equate any EM pulse to some measure of joules (however small) then it calculates some mass even for a photon and its mass would b…

Hi all I would like to know if it is possible to read the ethanol concentration in a liquid by spectrometry (but the liquid could contain other colors), and if yes, how to (on which frequencies do the ethanol absorbs light ?) Thank you

Consider a flow in a one layer, two dimensional tunnel/bay. Assume edges in the y-direction across the bay, but no edges in the x-direction of the flow. If we assume the velocity across the bay to be 0, and the situation to be stationary ([math]\dfrac{\partial}{\partial t} = 0 [/math]), the the left side simplifies to a one dimensional directional derivative [math]u_x \dfrac{\partial u_x}{\partial x}[/math]. Assuming constant pressure, then the right side simplifies to [math]\nu {\nabla}^2 u_x[/math]. We only have friction from the edges, so the viscosity term further reduces to [math]\nu \dfrac{\partial}{\partial y}(\dfrac{\partial u_x}{\partial y})[/math], or [math]\dfr…

This is an odd question, I know, but I watch plenty of crazy shows and they rub off on me. Say you are super fast and strong, and you see a nice puffy cloud 7500 feet in the air, a few miles away. Let's say you are capable of throwing a punch at hypersonic speeds, creating a wave of compressed air. Just about how fast would you need to punch to make a shockwave capable of busting the nice big cloud? You can make up your own calculations for how far the cloud probably is, as I assume you have a basic idea of what I want to know. Remember also, to take the size of the fist into account. I'd like the answer to be in mach number. I shall grant ten points to the genius who sol…

why don't we have a pole of super conducting material connecting a large body of water to space - thus creating free super cold water which can be used by power plants? apart from the logistics of getting a long enough pole and getting it to stand up, of course. theoretically, would it work? this theoretical pole could connect the ocean to space as well, thus reducing the temperature of the ocean - although you'd have to have the ability to disconnect it at will, or the whole ocean would freeze over!

Okay just toying with a concept, basically id like to create a scale of one thing to another in a ladder type fashion. It doesnt have to be a size ratio necessarily but a basic rule applied to each scale. The basic rule being that the next in line is the accumulation of the aforementioned So, for example: Sub atom < Atom < ??molecule?? < Organism < Animal < Planet < Solar system < Galaxy < Universe Im not sure what would go from Atom through to Animal but i think you get the idea. Im not sure if molecule fits, or whether a macro-organism is separate entity to an organism.

Deuterium is a stable isotope of hydrogen. If hydrogen (protium, thats hydrogen-1) is bombarded with neutrons, why does this not create deuterium? If I am correct fission occurs (do correct me) because particles conjoin with isotopes that were previously stable. Now the isotope has an extremely short half-life and decays. Well what if the particles are not intrinsically repelled by classical physics and the particles collide?

anyone know what the hydrogen line is? i read some bohr and all i got was a reduced planck. atomic physics hit me!

Particles in quantum mechanics are often seen as wave packets - linear superpositions of plane waves summing to a localized excitation. But wave packets dissipate - for example passing such single photon through a prism, its different plane waves should choose different angles - such single photon would dissipate: its energy would be spread on a growing area ... while we know that in reality its energy remains localized: will be finally adsorbed as a whole by e.g. a single atom. Analogously for different particles like electron - any dependence on momentum while scattering would make such wave packet dissipating (e.g. indivisible elementary charge). How is this problem o…

since a long time physics was one of the fields that attracted scientists and boggled their minds , ... since then the discoveries of different phenomenas and the elaboration of the laws that governs them has taken a fast pace . That was a big fortune for many other domains who have benefited greatly from these discoveries . but since many years , we notice the the frequency of these discoveries has decreased and physics comes to an era where its facts are becoming more like science fiction , the duality of light , the multiverse , the quantum entanglement , ... etc now we wonder , has physics come to its end ? , are we going to see in the incoming days some other great…

What model of aether do Michelson and Morley.et al easily disprove? ron

From refrigeration to BECs. Two-part special, scheduled Jan 8th and 15th http://www.pbs.org/wgbh/nova/zero/index.html "The two-part special follows the quest for cold from the unlikely father of air-conditioning, the court magician of King James I of England in the 17th century, to today's scientists pioneering superfast computing in the quantum chill near absolute zero" The second part will be about the more recent advances Ultracold atom Q&A with Luis Orozco (U. Md, formerly at Stony Brook) http://www.pbs.org/wgbh/nova/zero/atoms.html

this may be kinda stupid but isn't frequency * wavelength = velocity ? how is λν = c , that implies that the speed of light is dependent on wavelength and frequency . more importantly . e = hf , and e = h c/wavelength . Should'nt it be e = h velocity/wavelength .

Why do ripples formed in water after throwing stone are circular not of the size or shape of stone ?

1) Why can hitting a heavy metal target with high-speed electrons produce X-rays? 2) Alpha particles have a larger mass and lower speed. Thus, they are more likely to knock electrons out of air molecules. Why? Is it about momentum? I thought particles with high speed can knock electrons out of air molecules easily. 3) Can we completely block gamma radiation? My teacher said that we can't. A piece of lead of 25mm can only reduce the strength by 2 times. If you add one more lead, then the strength will be reduced by 4 times. This goes on and on and then eventually the strength is still not zero. Is he incorrect? I think we can come up the number of leads that are us…

Hello everybody I have a question concerning the formulas of energy and its unit [math]E=\frac{m\cdot v^2}{2}[/math] [math]1 J=\frac{1 kg\cdot 1 m^2}{2\cdot 1 s^2}[/math] and [math]E=m\cdot g\cdot h[/math] [math]1 J=1 kg\cdot\frac{1 m}{1 s^2}\cdot 1 m=\frac{1 kg\cdot 1 m^2}{1 s^2}[/math] And because [math]E_k=E_p[/math] (e.g. a mass falling from a height its potential energy will be converted to kinetic energy when on its lowest point): [math]J=\frac{kg\cdot m^2}{s^2}=\frac{kg\cdot m^2}{2\cdot s^2}[/math] [math]\Leftrightarrow \frac{1}{2}=1[/math] What is wrong with my reasoning? Thanks! Function

Does anybody know how to find the constants a and b of the constraint equation of the frequency of the radial oscillations of carbon nanotubes with their diameter? Thanks in advance.

Albert Eienstein said that E=MC2 which means that Energy weighs the same as mass x light squared. When you look up a google search it says that energy does not weigh anything and further the synonym for "weigh" = ignore and neglect. Let me put my attention and focus on my equation Energy x acceleration=Force. At first glance people would say that it is impossible to weigh energy. So I did a little research. First, I went to a car show. There were many mean cars with souped up engines and one that had forced air into the intake. The man showing the the car had it calculated that 10,000PSI was being forced into the intake. PSI is pressure per square inch. Since pressure can…

How is neon manmade? Im doing a project, can anyone help me and revise the document? 20131020-Neon Research Project (2).doc

I have a question that I've been pondering for a while and I can find the answer to. Why do flakes of cereal in a bowl with milk, bubles on water, etc. stick to eachother? What is this called? Why does it happen? Thanks in advance. Peace Out, herpguy

When you force a material to vibrate at its resonate frequency, what's the path of movement it vibrates at? example :: Tuning fork - strike the fork against any surface. Does it always vibrate on a single axis or radial arc? reason :: I would like to create an experiment where I can force vibration to occur only on one axis; continually moving back and forth. This action, coupled with a magnetic coil, might generate enough electricity to power a small device. Also, if an object keeps vibrating at its resonate frequency, will it eventually degrade?