Phenomenon Definition and 199 Threads

http://arxiv.org/abs/0804.2475 The Void Phenomenon Explained Jeremy L. Tinker (KICP, UChicago), Charlie Conroy (Princeton) 8 pages, 5 figures, submitted to ApJ (Submitted on 16 Apr 2008) "We use high-resolution N-body simulations, combined with a halo occupation model of galaxy bias, to...

Hi everyone Thanks for taking the time to read my first post. I was reading Bill Bryson's A short history of nearly everything (which may be like saying that I was reading cat in the hat in an english literature forum, but i shall see). Unfortunately I don't have the book here, or i would make...

Homework Statement Hi 1) I read the following article: http://pdg.lbl.gov/2005/reviews/passagerpp.pdf On page 12 of the .pdf there is a figure, figure 27.8, which shows how a charged particle deviates from it's path when scattered by the Coulomb force that comes from the nuclei of the matter...

Hi all, I was asked something today at college. We're learning about Fourier series and we talked about the Gibbs phenomenon. The teacher asked us if we could possibly come up with a way of estimating the width of the oscillation in this phenomenon. I understand that increasing the number of...

Surrounding the planets usually exists the various atmosphere. Due to this atmosphere, one light ray crossing the planet will be refracted more if it comes more closely to the planet's surface. So how to know that " gravity field phenomenon is the curved light ray" is not created by the planets'...

While I cannot now offer a page #, Smolin in TWOP offers his assessment of string theory as a theory of QG by pointing out that while GR does offer quantitative predictions of time dilation effects, string theory does not (if I understood Smolin correctly). Any comments?

hi all why do many things in physics move in waves ? in fact , if I am not mistaken , everything apart from mass moves in waves : electromagnetism ( and light ) , heat ( not ? ) (do phonons move in waves or lines ? ) , radioactiv rays , weak nuclear force , gravitons (?) and many "...

I've taken a picture of my christmas lights. I'm wondering if someone could help me explain, or at least name, the phenomenon? http://img142.imageshack.us/img142/5925/physicsphotocontestto9.jpg Why does light appear to come from 4 distinct points around the light? Even though some bulbs...

Ok, so there is this strange phenomenon that I have experienced several times before. I want to know if anyone else here has had this problem or if they have any idea what it might be. AS A RESPONSE TO THE ABOVE DISCLAIMER: I will not consider any response as a diagnosis but as of now the...

Well. Its happening as I speak, and I have never seen this before (and neither has anyone else in the house). It is completely sunny out, and suddenly, rain starts falling in our front yard. We realize that there isn't any rain in the backyard, or even on the driveway. The rain was only...

Greetings all, I am an avid airsoft enthusiast. For those of you unfamiliar, airsoft is a bit like paintball, but without the gooey mess. In any case, a few friends and I were experimenting with the performance of one of our bolt-action sniper rifles which fires 6mm projectiles weighing .20...

Hi. If you were on a train going 700mph and you shot a gun out the back that fired at 700mph. Would the bullet drop straight to the ground relative to the earth?

Levitation is a well documented phenomenon, in fact ancient yogic texts (Hatha Yoga pradipka, yoga sutras, etc) as well as modern ones (Science of pranayama by HH Sri Swami Sivananda) claim it to be a siddhi (psychic power) which one can acquire. Even the christian faith has had its own...

Non-linear ODE, "blow-up" phenomenon On page 40 of Steven H. Strogatz's Nonlinear Dynamics and Chaos, question 2.5.2 says: Show that the solution to x' = 1 + x10 escapes to positive infinity in a finite time, starting from any initial condition. (Hint: Don't try to find an exact solution...

A few weeks ago Physical Review published a Letter (an edited version of http://arxiv.org/abs/gr-qc/0702028" ) that says: "At this time, [Lunar Laser Rangefinding] provides the most precise test of [the gravitomagnetic phenomenon,..] likely better than the ultimate result from the GP-B...

Everyone must have wondered about this question from the very first moment they hear about the incompleteness theorem. It is what scared everyone back in 1931 after all, no? ('If he's right then...' -they must have thought in Cambridge and Göttingen at the time. And indeed such comments have...

Ok, first I'll mention that I'm completely new to these forms (first post) and all that jazz. Anyway, on to the subject of the post. In my physics class (high school level only, mind you) we were doing a lab with long slinkies to show the properties of waves and such. Our teacher wanted us to...

Galileos idea of a fixed value for the gravitational acceleration on the Earth iss now accepted for most pratical calulations allthough variations in the Earth's crust mean that this value is not precisely uniform. However there is another phenomenon that will affected the decent of the cannon...

I recall hearing about a phenomenon where atoms are somehow bound. The example went something like this: Pairs of atoms are contained; both with a single valent electron that rotate opposite each other, (not sure what element it was) but the atoms do not share these electrons. The electrons...

I picked this up on another board and am mystified. I'd like some more input on it. What do you guys think? Note especially the naked eye confirmation and the multiple witnesses. A co-worker of mine, out on the weekend at a campsite, looked up at the moon and noticed a strange red...

Snapped this pic the other day. At first, I was drawn by the subtlety of the central tip of the cloud, which is illuminated by reflected light from the sunlit mound of cloud between it and us, but I was wowed by these fanlike structures in the sky above the cloud. Those are not digital...

hey, is it possible, that when you throw a piece of a newspaper true the window of a train, the paper enters back at the following window ? thx laurens

I was just wondering if anyone could explain the phenomenon seen when a water droplet falls into larger expanse of water (i.e. the kind of water 'tower', like in the picture)? It's something I've wondered about for a while, and I've never managed to come up with a satisfactory answer myself...

If on a taut string, we have a wave pulse traveling in the positive x direction with an amplitude A... simultaneously, from the other end we have a wave pulse traveling in the negative x direction with amplitude -A (i.e., it is faced downwards) At a certain time t, they will superimpose upon...

How can magnetic field be a relativistic phenomenon?? According to Purcell (in his book: Electricity and Magnetism) the magnetic field force affecting a moving charge parallel to a current carrrying conductor is merely resulting from the electric field in the lab frame obtained when...

Please tell me a website in which daily physics phenomenon are discussed like. Why do many cows die during a thunder storm even though the lightning does not hit them directly? Why can a bird sit on the power line? etc what is the reason when we touch a stick of wood during electric shock...

I really need to figure this out. I was driving down a straight road with the sun to my right at an 85* angle. You would expect the light rays to appear straight because light cannot bend, but the the rays appear to bend across the glass. Can anyone help me explain this...? I know it has...

Hello, Quick Q. What happens when 2 sperm fertilize the same egg? Obviously it's extremely rare due the sodium ion channel's ability to quickly change the electric potential across the egg's membrane, preventing polyspermy. But what would happen if two sperm nailed the egg at EXACTLY the...

There's a machine that uses a type of plastic material (reinforced Teflon) as a wear ring. The plastic rides on a highly polished metal surface and eventually wears out at which point the machine must be rebuilt. If the plastic and metal sliding surfaces are exposed to bone dry (ie: no water...

I just read this from Wikipedia: Incandescence occurs in light bulbs, because the filament resists electron flow. This excites electrons in the filament material to jump to a higher atomic orbital and thus subsequently release a photon when they fall back to their original orbits. Depending...

The "Greener Pastures" Phenomenon Good Morning, How many here are thinking about switching out of physics to pursue a career in the financial services industry? Three students were graduated from my old research group: All of them decided to leave physics and work on Wall Street^*. Anyway...

Last evening there was the perfect rainbow condition: A bright evening sun shining into a rainstorm just overhead. I went outside to see both complete arcs from horizon to horizon . THen... the inner rainbow (the most commonly seen rainbow, with red on the outside of the bow) looked odd...

Light always wants to travel in a straight line, however, the space is curved around massive objects such as black holes, so it would seem as if the light was being bent as it traveled around the black hole. The space around the Earth is curved.. so satellies traveling along parallel paths can...

i was walking along somewhere and i see this street lamp. ... lol anyway so this street lamp is like ish bright, like you can look straight at it w/o hurting your eyes but its still bright. and i noticed that when you look at it, there's this like spherical shell around it, (when its dark...

why do we call the "twin paradox" a paradox in einstein's theory of relativity when we know exactly that the phenomena it describes is possible theoretically

I think my situation below can only be explained by a physicist, so I hope I came to the right place! On our hydraulic test bench we use a glass tube, float type flowmeter (also called a rotameter?); fluid is hydraulic fluid and non-flammable; the float is anodized aluminum. We occasionally...

http://geomaps.wr.usgs.gov/parks/deva/racetrack.pdf [link updated] 6/20/09 New Paper Claims Explanation https://www.physicsforums.com/showthread.php?t=60676&page=5#90

propagation of errors? (lab "phenomenon" question) In our lab, we are measuring the acceleration due to gravity. We do this by dropping an object through a photogate, which records position vs. time data as the object falls. From this position vs. time data, the computer uses derivatives to...

Is it 'noumenon'? Is my understanding correct? Please feel free to delete this thread after it has been answered (if you feel it serves little purpose) :smile: .

is global warming a natural phenomenon? I think it is . But we can enhanced it such as we produce tonnes of carbon dioxide every day, causing the greehouse effect strengthen and finally lead to global warming .

Hey guys, I was just wondering, why can some pictures be only seen through a polarizing film, or when illuminated by polarized light? I would really appreciate your answer. Thx, Xen0 :biggrin:

Today when I was toying with a water rocket I came upon a strange phenomena. The setup was like this: I had a 625 mL coke bottle, filled half way with water. The cap had a nice hole in it, about 1.5 cm. I turned the bottle upside down, thinking that the water would just gush out, but low and...

I decided to write to you directly in front of the importance of my discovery. I hope that you will not hold rigour of it and of my tinted English of French Canadian accent.I believe that this discovery can bring answers that are missing to the models of the universe we have. During the last...

I have noticed that when you keep in direct communication with a person, you have a tenedncy to think alike. What I mean is, you often think the same thing at the same time, and say the same thing at the same time. This phenomenon has been reoccuring for many years with someone very close to me...

Hi all, maybe this is not the proper forum to post this. Because it rather belongs into a section 'strange effects in everyday life', or whatever. Well. Yesterday I opened a bag of peanuts. The ones that have the closed shells which contain two nuts each. I found the best way to crack them...

When a magnetic field is applied to a diamagnetic, the dipoles align opposite to the direction of the magnetic field. However, when a magnetic field is applied to a paramagnetic, the dipoles align to the same direction of the magnetic field. My professor mentioned in class that the...

Hi,everyone Everyone of you must have done the following experiment while you prepare your breakfast. Put an egg (boiled or not) in a glass or brig then put the glass under a tab and release the water, you will notice that seconds later the egg will slowly arise to the top of the water...

Can anyone explain to me the red shift

Has anyone else heard about this? http://science.nasa.gov/headlines/y2003/12mar_darkspot.htm?list827141