Classical Physics

Suppose someone parked his or her car in front of my driveway. I don't want to ask them to move it, I don't want to push it, and I also don't want to hijack it. Instead, I will use a magnet. I want to figure out how big this magnet needs to be.

If I had a perfect glass(completely transparent) pane, with a slit cut into the center, that has a length lesser than the wavelength of photon A, and I shoot a stream of photon A perpendicularly to the slit,(the whole apparatus in a vacuum), will the photons show the single slit diffraction phenomena on the other side, or would just it pass through the transparent glass?

In the theory of electricity and magnetism, which follows from Coulomb's inverse square law, the magnetic field and force arises from moving charge due to considerations of special relativity and different moving frames of reference. Therefore, since Newton's and Coulomb's laws are identical in form (both inverse square), with the exception of the constants involved, and the fact that Coulomb's law allows for charge and force to have the same or opposite signs, why is there NO analog to magnetism in the theory of gravity? Why doesn't a moving mass (or "mass current") give rise to another velocity-dependent force on a nearby test-mass, as a moving charge does to a nea…

Hi, I need to know how is it possible to generate a distribution having the properties of power law distribution by Matlab. I need to know what estimators we exactly should have to be able to generate this distribution? I have some references for this question however I don't understand them: http://arxiv.org/pdf/0706.1062v2.pdf I appreciate your help, Cheers,

I want to know about relation between speed and tension.If there are two roller on the machine and there are all speed control. The function of rollers does to carry the material. So I need control the tension avoid to break the material.In order to build the tension, the first roller speed have to slower than the second roller.I want to know the different of the rollers speed that can build how many tension? I know that it can control tension use PID function.But I just want to know relation between the different of the rollers speed and tension and the formula.please help!! The data See the following drawing.

Hello everyone, Is there is a formula that would allow me to calculate the volume of water that can be extracted from air in fonction of the area of the collecting surface, the airflow, the air relative humidity rate and the difference of temperature between collecting surface and ambient air. basically I need the formulas to answer a question of this type : if I was to send 10 liters of air (at 30 celsius degrees / 65% relative humidity), every second, on a 1 sq meter surface cooled at 10 degrees celsius,and providing I manage to collect all the extracted water, how much water would I collect in, say, one hour? Thanks in advance for your answer Ludovic

Greetings I need to resolve a non-linear equation system and I don't have a solver for Mac....Does anybody know one? Best Regards

for electrically conductive metals, the thermal conductivity ( Watts per area per temperature gradient ) seems to be two orders of magnitude more, than one would expect, from heat capacity, propagating at the sound speed: [math] thermal conductivity \gg C_m \rho L^3 L L^{-2} \frac{C_S}{L}[/math] where L = lattice length, typically several hundred picometers. So, i conclude, that heat flows far faster, than the nuclei are jostling back and forth, fro' and to. Q: do conduction-band electrons play an important part in thermal conductivity (in electrically conductive metals) ? do nuclei, in the hotter zones, impart energy to conduction electrons, which then zi…

Oxygen is electronegative, and "steals" (up to) two electrons, to effect an electron configuration similar to neon. In such a state, the full valence shell is spherically symmetric... and spherically symmetric charge distributions, perceived from afar, are those of point charges, of the same total charge, located at the centers of those charge distributions. So, the potential, of O-- would be [math]\approx \frac{-2 q_e}{4 \pi \epsilon_0 r}[/math] But then you must re-remove two electrons, from two 2P orbitals... given that Oxygen forms bonds about its equator, into Px + Py (hybrid) orbitals, the equator seems the appropriate place to re-remove two units of charg…

I'm looking at JSTOR, but I'm not getting anything except a bunch of math papers. I remember that the tests of relativity were easily searchable on places like Wikipedia, but Wikipedia doesn't mention a list of tests for the Law of Conservation of Energy. So where can I find, say, a list of tests in a version I understand and know they are experimental tests, and get a feel for how many there are?

Hi guys I just signed up to these forums because I love the science discussions here and I'm pretty big on science myself. Here is my first question and my body and I are arguing non stop about this. Can wood break metal ? I know metal is a lot denser than wood but lets take this scenario: If there was a metal wall about 2 inches thick and it was made out of steel and it is 6 feet high and 3 feet wide, how much wood would have to hit it at what speed to break through the metal ? Is this even possible ? Can wood ever break through metal at all with enough force and speed ? I have hear a theory that states any material at any density can always break some…

is fire opaque, to EM radiation ? can you project a laser-pointer, through the flame, of (say) some cigarette lighter, or a candle ? http://www.astro.princeton.edu/~burrows/classes/514/opac.2.ps As a thought experiment, if the cores of big bright blue super-massive stars are ~1 g/cm3, ~100MK, then the Kramers' Opacity implies a mean-free-path of ~10-100m... so if you could somehow bury yourself inside the center of some super-massive star, then w/ some sort of super-dark star-glasses you could see through the star, like fog on a football field, from post to post are those numbers accurate, for said supermassive stars ?

I can't help but try and link them with states of matter and I get all confused. I'm sure it's something to do with electrons and energy transfer but I'm getting very confused. What exactly are they!?

hey guys, i'm planning out a model rocket design with store-bought motors (unfortunately i can't get my hands on any oxidizers, stupid canadian law...) and i'm planning to go with a cluster motor design because i plan on sending some payload. i'm planning on using 3 estes e12-0 standard motors (those are the strongest e-type motors right?) what i'm wondering is what type of mounting design should i use. i have two ideas: 1. put in 3 motors evenly spread out, tilted parallel to the tangent of the circle. 2. 3 motors evenly spread out, tilted both, parallel to the tangent of the circle as well as perpendicular to the tangent of the circle. i don't know if that m…

Hi, Can anyone suggest me some good references for center of mass of a triangle. thank u..

Ok I have no idea as to how to give a visualization of this question so I will do my best here. ALSO! C and h play a role here so excuse my question when I mention them... We can keep this simple using a Hydrogen Atom​ This inquiry has to do with atomic orbital "shells" in relation to excited states of the electron jumping from one orbital to the next... When an electron in its " excited state" jumps from one orbital to the next orbital is it: The same electron? I assume the electron does a disappearing act while it's doing this. But then we have the mass-less photon that transfers energy to the electron that allows this to happen???…

Can Mu-Metal be used as a core for an electromagnet? It has a very very high relative permeability, good advantage! And other wonderful properties, what problems could it cause if ti was indeed a core for an electromagnet? Unfortunately, it saturates a very low fields, how can this be solved? By increasing the size maybe? V.

I've seen it done with a small frog. How could it be done with a human being (If at all plausible)?

How do Physicists Consider Interpolation? The following link shows a statistics method on dynamic responses to time. Here is a link: Applications of Imaginary Numbers in the Real World http://www.picomonster.com/complex-numbers-meet-dynamic-systems-lesson-2/ However, Do Physicists Consider Interpolation in this link above? My personal issues with Interpolation: In 3d animation using my computer it uses curves for editing motion of the game, characters and etc. I have 3 options as per animation Interpolation: 1:Constant 2:Linear 3:Bezier I "always" choose "Linear" otherwise there will be a delay in the anim…

Let me give you these figures first: -The loop is 4 lanes wide. -It's diameter is 60 feet. -It's circumference is 188.4 feet. -The rider is riding a 2000 CC motorcycle. How fast would he have to go to get through the loop?

Many think its because there is empty space but this isn't so. Even a baseball sized rock will destroy it. How does it not crash? Im no physicist but if it is going along with the gravity how would it hit anything if everything too is going with the gravity? I might be wrong but this is a question. We all need answers. More than 35 years has passed and Voyager 1 or 2 never crashed. Discussions like these help us to understand interstellar space travel. We could one day MANtravel by jet propulsion and get resources from other planets and travel to the nearest habitable planet.

I'm currently building a hovercraft, with two leaf blowers. I need to know the trust of each leaf blower to know how/where to position them on the hovercraft. Both are identical models (craftsman, 200 mph, 430 cfm/ each). I'm a bit stuck on how to convert the CFM to thrust to know how heavy someone can be for it to work properly. Thanks, EE

Why do calculations need to be balanced anyone? Yes I understand how a check book needs to be balanced otherwise you get over-drawn. However that is a man made system of monetary. How does that apply to chemistry, nuclear engineering, and even in Wall Street IE Stock Market? I don't get it nor fully understood this for many years. For instance, how can something be balanced using pure math and numbers? To me this sounds impossible especially when this is linked to chemistry and other physical natural laws of the universe, unless their are constants of some kind? IE : percent used for money, pi ratio, the speed of light, g for science? This being…

I have been given the task of calculating cooling time for an extruded steel rope running thru a water through at a certain feet per minute speed. I have been researching heat transfer formulas, but cant seem to find one involving time although i vaguely remember there being one from Physics classes years ago. Can anyone help me with the correct formula i should use for this?

Yes, what's the difference between tesla coil and tesla tower? Thanks