Classical Physics

Hey guys, here's a problem you've probably never had to solve... Basically for Halloween, I want to be Captain America. Here's the link to my costume: http://www.aliexpress.com/store/product/2014-Newest-Captain-America-2-The-Winter-Soldier-Stealth-S-T-R-I-K-E-Suit/726281_1854176469.html And, the shield: http://www.aliexpress.com/item/Captain-America-Shield-make-of-metal-1-1of-Animation-Using-for-cosplaying-and-wargaming/1903333190.html Now, you must be wondering right now. What does this have to do with neodemiyum magnets?? Well, let me tell you! Basically, I wanted a way to take the shield off my back, and put it back on without any hassle just like Captain Am…

Ive read that even a little thimble-full of matter from objects like nuetron stars weigh an ungodly amount on Earth. My question is, can this matter even exist on Earth? Is there a limit to how dense an object can be on this Earth? Thanks for any info

Hi, I was recently in a discussion/arguement with a new age spiritualist, he was using quantumn physics examples to show free will and argue about spirits and weird stuff. Especially he was speaking of morality with references to positive and negative and the attributes of the electron and proton. I argued that positive and negative are simply words to describe the electron and the proton as opposites, the descriptions could actually be switched and thus the (Maxwells) equations could be inverted and obtain the same results. I was just wondering if I was correct, because I just bluffed I knew that. So anyway, if we refered to an electron as having a positive charge a…

I understand that there's a definite relationship between the size of an eye and the wavelengths it can receive. This being so, just how small can an eye be, while still able to receive light in the visual spectrum? NB. Here, I'm referring to what might be described as 'camera' (or animal) eyes, rather than the compound eyes of insects. Many thanks.

I've recently been considering buying a material titled "sorbothane", a very soft and energy-absorbent derivative of polyurethane. The product list can be found here: http://www.sorbothane.com/blog/wp-content/uploads/2012/12/11-26-12-Sorbothane_SPG_11.2012_v4.pdf My question is, when one examines the 4"-by-4"-by-1/2" square pad of durometer 70(product 0204025-70-10), it claims to be able to withstand a load of up to 7400 pounds, or about 33 kN. Now, this already seems kind of ridiculous, but maybe that's just how good it is. Maybe. But how does that translate to impact force? I've been trying to calculate, as a rough example, how much force a person would experience if …

We usually associate centrifugal force with Newtonian dynamics. Does this applied at the micro level manifest itself at the atomic scale. if so how ? Please explain.

This docent make sense to me. Lets say that you had a tub of salt water it the middle of the tub there's a divider. On one side of the tub theirs more salt than the other. If you remove the divider the salt would move around until there's the same amount of salt everywhere. Why is this. Why dose hot air rises i know its less dense because heat expands but how dose that have anything to do with it rising. Dose it weigh less because its less dense than cold air.

Hi everyone, just as a quick introduction I am an I.T. graduate and only did physics in high school. I wrote the following 4 years into my I.T. studies and I am posting it up because I want to get an honest rating from 'science people'. So please give it a look and a rating. THE FOLLOWING ARE MY OBSERVATIONS WHEN DROPPING THE CLICK PART OF A CLICK PEN ONTO A BOOK. THE CLICK END PRESSED IN THE HIGHER THE PEN WAS DROPPED ONTO THE BOOK. NOTHING HAPPENED TO THE BOOK The velocity of an object with constant mass freefalling does not change because of gravity accelerating at a constant speed(9.8m/s). It seems as though the height from which that object falls determines the…

on the subject of gravity in general, supposedly mass warps space and the action of gravitation stems from this behaviour. If so, then why does mass affect space? If space consists of a flux of virtual particles within it, is the distortion of the flux orbits the cause of "bent space", perhaps by perturbing the normal circular particle orbits into an ovoid? The strong example of this would be hawking radiation, from distortions of the orbits to the point of separation of the particles...If a particle orbit is lengthened by the change of orbit shape, perhaps the delay in the annialation of a particular particle once it appears in space is part of the underlying mechanism …

I've been reading up on the concept of an electrostatic field. They say that if the mathematics of the field results in the curl=0. From what I gather this means that the field cannot be rotated. Does the curl=0 also indicate that it's conservative? If so how?

I have a new theory My theory is that I will never reach the intellectual heights of people like Newton or Einstein so all I can do is ask questions to try and understand as best I can the theories that these people intellectually superior to me come up with. So I was just wondering if there is an upper and lower limit to how much energy a photon can have. I was thinking... if you travel away from a source of light, the faster you move away the more the light appears red shifted, it has a lower frequency and a longer wave length and so less energy. It still travells at the speed of light relative to you though. So if you were to travel ever faster you would …

Hi everyone From my physics course in medicine: [math]U=\int_{0}^{\Delta l}{Fdl}=\int_0^{\epsilon}{\sigma Old\varepsilon}=\cdots[/math] With [math]F[/math] force applied on a beam, [math]l[/math] the length of the beam, [math]\Delta l[/math] the difference in length after appliance of the pulling force [math]F[/math] on the beam, [math]O[/math] the surface of the beam, [math]\sigma[/math] the stress [math]\frac{F}{O}[/math] on the beam and [math]\varepsilon[/math] the strain on the beam ([math]\frac{\Delta l}{l}[/math]) Can't seem to figure out why this is... Can someone help me? Thanks. F.

I need your help to solve the following problem: Let's suppose we have a pipeline as in the drawing attached and inside it circulates a fluid whose trajectory is changed. From this change of trajectory of the fluid, results a reaction force which is equal with the force exerted by the pipe walls on the forward path of the fluid, in opposite direction, while the velocity vector is changing. When a fluid speeds up or slows down, inertial forces come into play. Such forces may be produced by either a change in the magnitude or the direction of the velocity since either change in this vector quantity produces acceleration. The change in momentum of a mass is equal to th…

I read some articles about Doppler effect today and found them very helpful.But, except for just recognizing if the object is moving away or toward us, can we identify the direction (as vector) of the moving object

The Energy Conservation Law states that energy cannot be created or destroyed, but may be transformed. A hydroelectric plant generates electrical energy, where does it come from? The weight of water (due to gravity) turns the turbines that turn the generators, so it seems the "force" of gravity is the driving force that produces the electrical energy. But, then from where does this force come? Can a force that does mechanical work come endlessly out of nowhere? Is the apparently endless energy created out of nowhere, in violation of the Energy Conservation Law, or is the electrical energy actually being transformed out of something else, and if so what? Wha…

How do you combine an electric field and a magnetic field around a charge/object/matter?

in other words do electrons flow through electric field lines, (I know stupid question but need reassurance about something)

Charge transfer = electrons flowing from positive to negative Electromagnetic radiation = electric + magnetic field

how do you combine field around charges and a magnetic field around dipoles

Please confirm & answer the following: An atom exposed to an external B-field will experience both a torque on its orbitals (paramagnetism), and a change in orbital velocities and thereby a change in the magnetic momenta of the orbits (diamagnetism). When the atom has all paired electrons, the net torque is zero so the phenomenon resulting from the change in orbital velocity dominates. But, when the atom has an unpaired electron, the net torque on that orbital is non-zero. Question: So do these orbitals physically re-orient themselves to align with the Bexternal? but the diamagnetic effect/influence is still present. Question: For atoms with unpaired elec…

the basic relation between potential energy and work energy is given below dU=-w Uis potential energy and w is work . Suppose the particle is moving away from mean position. work w can be calculated by applying dot product of force and distance. if x is the displacement w=modulus of force x modulus of distance x cos (angle between direction of force and distance) when the particle is moving away from mean position angle is 180 .therefore dU=kx .dx kx is the value of force and xis displacement because cos180=-1. On integrating the above relation U=1/2 k x^2 which shows that value of potential energy is positive. if the particle is moving away from mean position …

Anyone have any recommendations for a decent 3D E-field simulator?

We know the general solutions (wave equations) for a variety of waves. Why is it preferable to express them as second differentials?

Why random motion of molecules, assumed for kinetic theory of gas, is currently accepted as real displacements and thus pave for equating energy with motion? Nainan

This isn't homework. I'm reviewing physics after many years of neglect. Since a simple harmonic oscillator is a conservative system with no energy losses, then a driven undamped harmonic oscillator, once the transient solution has died out, can't be receiving any energy from the driving mechanism, else the system's M.E. would increase without bound. But when a simple harmonic oscillator is driven at the system's natural frequency, the amplitude of the position, and therefore the system's M.E. increases without bound, which can't happen unless the system is receiving energy from the driving mechanism. Specifically: Let [latex]\omega_{\circ} = \sqrt{k/m}…