Physics

Hi! So I really need help with a science project that is due on Thursday. Basically, the teacher will first be putting boiling hot water to see who can keep the hottest temperature and then an ice cube to see who can keep it "alive" for the longest time, I think she will be keeping each for 15 minutes. So basically we have to make an insulator. My idea is to wrap a Styrofoam cup in aluminum foil and then insert that cup into another styrofoam cup and cover the top part with Silicone caulking. PLEASE HELP MEEEE Much appreciation, Cookie Monster

Could anybody point me in the right direction as to how one would derive the equation below? [latex]E_{\gamma}'=\frac{E_{\gamma}}{1+\frac{E_{\gamma}}{m_0 c^2} \left(1- \cos \theta \right)}[/latex] I read it in my lab manual along with the Compton Wavelength equation (which I know how to derive) and I'm wondering where it comes from. Thanks.

I have an idea that i would like a well rounded physicist to give their opinion on. Look at this with open eyes to the extent that science always changes, what was once seen as fact gets discarded for theory's that make more sense or can be proven axiomatically. Okay so basically im thinking that if you had say a planet (or atom) that had only one satellite (or electron) in its orbital, lets use earth, the moon orbits the earth approx 12 times a year. Now if the earth and the moon are the only things in a particularly large vacuum and we zoomed out from earth and moon both in time and size. Now lets say 2 to the 64 in years, that is 2 to the 64th exponent, the amount…

How is electrical resistance effected by reletivity

So basically the idea is that the whole of the universe is expanding. The most common analogy I have seen is the balloon analogy depicted here: This is where Im supposed to post a picture of the expanding universe balloon. Just image search "expanding universe balloon" and you'll see it This analogy must he broken. If the universe is expanding, then the galaxies are expanding. If the galaxies are expanding,than the bodies in them must be expanding. If all that is true than we,as physical bodies, must also be expanding!! Think about putting a little dot in one of those galaxies on the balloon to represent yourself. You'll see that it also expands. So if…

I have a diode, an inductor (basically a coil) mounted on a breadboard which is connected to an oscillator from which I can alter the frequency, the dc offset and the source voltage, and it is also connected up to a an Oscilloscope. So I was wondering if anybody could come up with an interesting experiment to perform related to chaos in this electrical circuit and/or encoding/decoding signals. I have already done a simple experiment where I increased the source voltage and measured the points at which bifurcations in the voltage oscillations on the CRO display occurred (period-doubling bifurcations, windows of order etc). One idea I have is to connect another "chaos c…

Are dark matter and dark energy physical properties of an ever expanding universal system that will eventual die or vanish through entropy or some other catastrophe, or are they the antithesis of a system gradually morphing into a new beginning? Since I have a hard time believing this graph, I was wondering what other ideas might be out there? Image credit: NASA / WMAP science team. Would the Universe recollapse, like the yellow line shows? Would it expand off into infinity, watching its size increase ever-so-slowly as the expansion rate drops to zero, begging for just one more proton, as that would be enough to cause a recollapse, like the green line? Or would it exp…

When a matter and its corresponding anti matter collide, their annihilation leads to the formation of a new particle. But what really causes the collision of these particles from the conservation of energy point of view?

I tried to understand quantum mechanics, general relativity and quantum field theory on my own, learning just from books, without having to go to University to study it but the mathematical machinery is just too complicated for me to understand. So my impression is that unless you are very very good at math you have no chance of ever understanding quantum mechanics, general relativity and quantum field theory in this lifetime.

Say that we have a piece of tissue paper, how do we find the center of mass ? step by step experimentally???

The speed of light within a medium declines as far as I am told only within a medium, but is the same always with every pinball machine trajectory, but does it come out of the medium in a delayed manner? I mean like light that moves through a perfect diamond? I am asking this because I read that some very rubbery materials absorb alot of energy from a photon while it is cascading through it. Is light a "pulse shaped particle" when it interferes with a diamond and gets scattered around? And is it otherwise a sinus wave moving through a vacuum? In latter case, moving faster? If light can not be fine-tuned and is always the same whatever the situation, does this mean th…

We can create many things like pen book etc but how to create own dimension ??? Total number of dimensions? What is dimensional unit.

Are there any simple ways to test the amount of radioactive traces in tissues from dead animals? For some years ago I bought some Rhino horns from an auction company which they claimed were from the interwar period. I´ve been told that I could find out this by testing for radioactivity in the tissue because animals which were alive after ww2 had a larger amount of radioactivity in the body because of all the nuclear test explosions after that time. Anybody here who know how I can do this?

Could anyone give me some ideas on an experiment with tissue paper which in relation to physics? Any simple experiment will do. thank you

Been searching around youtube and I haven't seen any Popsicle Stick Bridge hit 400 Pounds that weighs less than 150g. Just wanted to share my friends bridge with everyone ;P Specs: 146 grams Weight Held: 400 Pounds Length 34 cm Materials: Popsicle Sticks Glue

Hello to all and any willing to offer me some insight! I'm looking to write a science fiction short story which may spinoff into something larger. However, I've run into an issue with exactly how to explain one of the things in my story. The story revolves around what I am currently calling an unstable element. I, however, am terrible with chemistry and physics, and feel only a general understanding is needed for the story to work. What I'm trying to do is avoid another "radioactive" supernatural (Marvel Comics) or destruction story, and in the story I introduce a newly discovered element that wreaks havoc on the planet. Without divulging too many details…

flow of electrons is called current which i know. my question here is that is that are those electrons moving from on the atoms shell to another atoms shell?

When discussing atomic bombs, there's always been the notion of "splitting the atom" and "undoing" the strong interaction. Is this truly the sole force behind the most feared weapon in history? I've always wondered if the fission just sets up a much larger reaction of combustive materials... Or if it's the actual fission itself that does most (or all) the damage.

The other day I was filling out an online quiz our professor assigned for our physics class. The question below was on the quiz. I don't need help answering it, but was wondering if anyone could help explain to me what this question is saying. Talking to my professor proved to have only confused me more. While he managed to give me a brief explanantion as to why the answer was E, I still didn't quite fully understand why. According to my understanding, equipotential lines are just graphical representations of pathways of equal Voltage. Having a higher "density" of equipotential lines therefore, didn't make sense. After all, aren't there technically infinite amounts of equ…

I have learned that copper is supposed to be diamagnetic. So the results of an experiment that I recently performed, confuses me. I took a small piece of aluminum foil and quickly moved it near the surface of a really strong neodymium iron boron magnet. Because aluminum is paramagnetic, the foil reacted to the magnetic field. It was as if it had "run into" interference. I could visibly notice the field tug on the foil. So then I took a thin, copper-coated board that I have. These are phenolic boards and are about one sixteenth of an inch thick. They have a layer of copper on one side and are used to make printed circuit boards. I ran the board over the ma…

A zillion years ago, about 8th grade in school, the teacher was demonstrating something and put water in a vessel to boil on a bunsen flame. He placed a glass/mercury thermometer inside to show the reading. I was the only one who warned the teacher that could not the correct way to measure the water temperature, as the thermometer bulb was contacting the bottom of the vessel and would read higher than real water temperature. Then he held the thermometer by hand suspended, touching only the water with an embarrassed red face. Now am thinking if I was wrong. Would the vessel be at the same temperature as the water contacting in it, or would the vessel be hotte…

hello, I had this idea for generating electricity, could it work?

Hey, I am currently studying for my physics exam, but this has nothing to do with my homework. Whilst learning I was wondering why sound travels at different speeds through different gasses. At 273 K all the gasses have + - the same amount of molecules per m3. So in my 'logic' thinking the molecules would pass on the waves at the same speed, because of the same molecule density. But apparently this is not the case. T= 273K Speed of sound through: Helium: 0.965 * 103 m*s-1 CO2: 0.259 * 103 m*s-1 Air : 0.332 * 103 m*s-1 I could not get a nice answer with google, so could someone properly explain to me why sound does this? Thanks

Hello, i am Gabby, also known as The6thMessenger, although i am a writer facinated by sci-fi, i write my stories governed by a solid structure of acceptable physics, and minor bits of theoretical ideas branching from an established fact. I've always been fascinated with anything that fires or explodes, much like a gun, but funny how i hate killing or destroying stuffs, i think i just love how the physics works. This idea, i got it when the Mythbusters wanted to blow a gas-cylinder in a single shot. Viral Flame – Armor Piercing Incendiary Injector 1.) Ballistic tip – balled tip for the projectile 2.) Penetrator – A super-hard metal with hooks 3.) …

Anyone knows a gas that is denser/heavier than air at room temperature (at 20ºC, add or substract 5ºC) and which isn't lethal to humans? (preferibly it gotta be translucent, but even more important, it gotta be cheap and safe for people to walk through it as long as they keep their nose well above it in order ot breath real air or only sink their noses in it as much as they can hold their breath)?