Physics

Hi I want to start a hot dog business but to save money on gas heaters would it be possible to run a steamer (designed for normal household electrics) off any sort of battery? I'm looking for a way to move to different locations without having to be near a power source the whole time. Is there any sort of portable battery that I could charge overnight and then use to power a small hot dog cart? Thanks Charlie

Practicle/Real Setup: I have a glass screen of length 35" and width 46.5". I have mounted one force sensor at the left top of glass screen and another sensor on the right top of the glass screen. Now, if I press my glass screen from any point on the screen I shall get some force at the left and some force at the right sensor output accordingly. I have hard and tought time to solve this problem. Consider the figure attached, I pressed at point A with (x,y) = (3,32). At the left sensor I am getting 7.015 Newtons. How much force I shall expect/get at right sensor?? Please refer the below info as well. Point A with left sensor: Angle = 45 degrees Distance from s…

Just a guess really jupiter really does stand out compared to the others, what happened in history to get that big? Another theory of mine, matter from the planets came from the sun. matter collects together close to the sun producing a new planet. and pushes the other older planets outwards. I think theres a lot of history here.Like rings in grain of wood we have different matter from the sun at different times of it's life producing different planets maybe? If were traveling to mars for whichever reasons, thats related to the past. Venus will be the future.

Hey guys, Im trying to design a electric gear shiftier for a motor bike. Basically I require about 200N of force to change gear with a 10mm throw (in both directions). I would like to use a tube neodymium magnet. (23mm diameter 25mm high with a 5mm hole throw the centre with a N48 grade) What I need help with is calculating the number of turns of wire, the current and gauge of wire of the coil. I will be using 12V supply and Im limited to 60amps current draw. So the magnet will be placed in the middle of the 45mm long coil and the direction of current flow will be changed to make the magnet travel in one direction or the other to change up and down. The magnet will ret…

How can OTH radar work? It bounces the waves off the ionosphere, but since the ionosphere changes every second wouldn't the radio wave be travelling on a different path on its way back from bouncing off a target?

OK I know that neurons interact with electricity and chemicals but are the chemicals that are used in reactions always used? Or are different ones used and where do previous ones go??? I read that it is ions that go from inside to outside and back in a neuron.

Hello, My apologies if this is not the correct forum. So here it is, I'm in contact with the University of Orsay (south of Paris, FRANCE), with the department of physics. They are looking to sell an old SEM (Scanning Electron Microscope), because they want to buy a new one. It is a JEOL 840 model, completely functionnal. If anybody has an interest in this, or knows somebody who has, I can provide additionnal information concerning it. Thank you and best regards, Wiss

Please can someone show me the steps needed to go about rearranging the equation Eph = hc/lambda to make lambda (the wavelength of the light) the subject? I'm totally stuck and I have an exam in the morning, I know it should be simple but I'm just not getting it. Any and all help is appreciated.

I want help in making superconductors at room temperature. A interestig thing about these superconductors is that in these the resistance and the potential difference is zero then also the current flows through it.i am just unable to understand it.

Why are we unable to convert lightning into usable electricity? Or is it that we can't store it? Could we convert a small arc of shock instead of the colossal flash? Just a question, is that 'spark' between two point the same as what you get when two electric rod adjacent create an electric arc to complete the circuit? I think it's called a spark gap. If these two are the same then there's something similar and we can start work from there.

I was reading on hyperphysics about electric charge. It says that a proton has 1,836 times the mass of a electron, but they hold the same amount of charge. It made me think about why is it that one charge is negative and one charge is positive? What determines if a particle is negative or positively charged? is it a certain property within the particle or is it something else?

A wonderful video from the great Feynman, explaining how science (and physics) work in terms of discovering the rules of nature. I wasn't sure if I should post it in Physics or perhaps in Speculations -- as a guideline for the occasional "science can't do X" poster. I figured, though, that it fits the scientific forum more. And another of his gems, explaining what science *isn't*:

This is a pretty cool take on particle physics as a "mystery" novel... quite amusing and informative! Maybe that's what we need to do with all of physics Source: http://www.symmetrymagazine.org/breaking/2011/07/11/a-particle-physics-private-eye-takes-on-the-great-interaction-caper/ Enjoy ~mooey

Okay he everyone, my first post here as I am in desperation for confirmation that these schematics will work. This seemed like the most suitable forum section to post this, apologies if it is not. I am in year 12 doing my HSC, and for DT I have decided to construct a guitar cabinet in which ambient temperature can be controlled and monitored (preserves guitar in extremes of weather). I have come up with my system, and will do my best to explain it to you below. Could you please tell me if it would work? _____________________________________________________________________________________________________ Heating +/- : -------> 150W Ceramic heater…

Is it possible to build a ray gun at home? With mostly houshold items, it is. Perhaps many of you have seen tutorials online on how to build a laser pistol, but these tutorials are almost always only reliant on weak laser diodes. This pistol is a SOLID STATE PUMPED laser. PICTURES: VIDEO: TUTORIAL: http://www.instructables.com/id/Build-a-Real-Ray-Gun-at-Home-1/ I hope you Enjoy!

I'm trying to make glasses for inverting vision so I can do the experiment where the brain gets used to inverted vision. I can't figure out how the mirrors would be arranged, and how to make sure the image is just like it's going directly in the eyes, except it is inverted. I don't need help with making the glasses, I just need to know how the mirrors would be arranged.

Physics myths true and false. - It is believe we can see photos. No you cannot see photos!! Only when photos bounce off some thing. - honey I shrunk the kids. There is no light at the somtomic level so even if some how you could skrink the kids you would see nothing as the photo is bigger than the atom and has a other wavelength frequency. We can build a powerful microscope to see the somtomic level. No there is no light at the somtomic level you would see nothing.And the light that is photo is bigger than the atoms. We can measure or use a instrument to find photos . No you cannot as photos take up no space thus it is not matter the sam…

I apologize for not posting these questions within a forum devoted to a specific branch of science, however these questions cover multiple fields of study, so this seemed to be the most adequate place to post them. First of all, please forgive me if these questions are sophomoric, for I am afraid that I myself am but a mere high school sophomore grappling with concepts that I can only review conceptually (Embarrasingly enough, I'm only in pre-calculus, so I'm not yet able to read some of the more technical works), however, I have been siezed by the pressing need to verify ideas that have vexed me for weeks. It seems to me that these ideas would stand to reason given the c…

It is a basic geometry statement that between any two points on a line there is another point on that line . But , between any two instants of time , is there another instant of time ?

I was taught that heat always goes from high to low. Now shouldn't any air temp. below 98.6 °F feel cool because the air would be taking heat away from your body?

Could someone help explain a few things about the double-slit experiment? These are fairly basic questions and they may reflect very flawed assumptions on my part, so please pardon this in advance. Here is where I am confused: 1. When electrons are fired at the screen, my understanding is they travel as wave-particle (with qualities of both). Question is -- do the electrons essentially travel straight, but in a sine-wave type of pattern? Or is there some sort of wave expansion as the electronic shoots forward, like the wave pattern that that forms when a raindrop falls in a pool of water? Or does it travel in some other mode entirely? 2. When the electrons…

Hi: Does a bituminous coal flame emit more thermal radiation than a methane flame of the same size? Thanks, GX

I'm currently working on the estimation of the velocity of a mobile in indoor environment. I show some interresting new perspective here: use the magnetic disturbances to estimate velocity) . This paper affirms that it is possible by using Maxwell's equations and adopting some hypothesis: - The magnetic field is stationnary. According to Faraday's law of induction in the absence of electrical source dBi/dt = 0. In other words, the magnetic field is a function of the position only. We not Bi(X) - The magnetic field is a potential field. According to Ampere's law, in the absence of electric and magnetic sources, curl(Bi) =0. Therefore, there exists a scalar function h(X) …

In my science class I was taught that the definition of matter was: Anything that has mass and takes up space. I was also taught that the definition of mass was: The amount of matter something contains. If we place the definition of mass into the definition of matter we get: Anything that contains matter and takes up space. This is a circular definition. One rule of definitions is that they can't be circular. Can anyone tell me the real definitions for these terms?

I'm a bit out of my element here (biochem grad), but I'd like to give my cousin some guidance regarding careers in theoretical physics. This is really to alleviate pressure from her parents, as they're skeptical she can come out of academia and apply her degree (she's nearly done her 1st undergrad year, so there's still a long road ahead). So I have a couple questions: 1) After her undergrad, what's a good next-step for a recent graduate of theoretical physics? 2) What sort of jobs/other fields can leverage a degree in theoretical physics? (And yes, I understand that asking advice on applying a degree based on theory is rather ironic!) 3) If you have …