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How to relate the radiation pressure to the internal energy?
How to relate the radiation pressure to the internal energy of an object?? How to get that formula P=u/3?? http://en.wikipedia.org/wiki/Stefan%...mic_derivation Thank you. Attached Images radiation.PNG...
View ArticleElectric field inside a conductor
Hello, I was curious, why is that for an electric field to be zero, the conductor must be in static equilibrium, but when charges are moving, the electric field is nonzero?
View ArticleMagnetic field at the edges of a current-carrying wire
At the edges of a very long current-carrying wire, the magnetic field is not the same as in the middle, right? And integrating biot-savart's law in the edge-region of the wire will make it possible to...
View ArticleAttempting to graph momentum help!
What I am trying to do right now is graph momentum as a linear slope on a graph. What I know is: p = mv Now, I've collected data giving me the velocity of the object, and I also have the mass. Now All...
View ArticleGyroscope speed change question
Hi, i tried to figure out and made some research but with no luck to my problem: Let us supouse that we do have gyroscope with no friction (of course theoretically). We can imagine something like...
View Articlefresnel transform
Hi, I hope everybody is doing fine. My question is how can I show fresnel transform written in terms of fourier transform? I really need your help. I m stuck. Help me. thanks is advance.
View Articleneed help, Series RLC resonance circuit, not getting high voltage!
Hi all. I am currently building a series RLC circuit as a magnetic field transmitter. Because I want to have a strong magnetic field, I need high voltage by making the circuit at resonance. Here are...
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Calculating torque of peristaltic pump
Please see the attached drawing. I am attempting to create a force diagram of a peristaltic pump with three rollers. I would like to be able to form an equation that will allow me to calculate the...
View ArticleIs "support force" a "true force"? it seems incompatibe with F=ma
For example if a box is sitting on a table, not moving, it is said that the table exerts a support force on the box. But the box and the table are both inertial right? so if F = ma (force = mass x...
View ArticleQuestion on heating curves
When i heat up an object, the kinetic energy increases. But since kinetic energy can be converted into positive or negative potential energy when it vibrates, during the heating process how can we say...
View ArticleMaximum possible current in a Conductor
If we are given a metallic conductor in a given Temperature(Room temperature here), Area of cross section A, is there an upper limit to the strength of the current through such a conductor due to the...
View ArticleHorizontal force on a pendelum - what drives it upwards?
Two questions: 1) If you have a horizontal force in the x direction on a pendelum supported by a wire, then it will go upwards and in the x-direction. What is the vertical component which drags it...
View ArticleEM field due to a long wire submitted to an AC current
Hello there, I am having a real stupid moment. In the space XYZ, a long wire is along the Y axis and is submitted to an alternating current [itex]I_{0}\sin \omega t[/itex]. I am trying to establish the...
View ArticleAn angle at each point in spacetime and A_μ?
Suppose we have a field that is represented at each point in space by an angle that is a function of time, θ(X,t). Can we make the following identification with the electromagnetic vector potential...
View ArticleLorentz condition for potential and gauge theory
Hello there, im new and don't have any background in field theory such as gauge theory etc.. i knew that in maxwell's eq, there are called Lorentz's condition... and when i want to probe it for more...
View Articleamount of scattering calculated from scattering cross section
I was reading Wikipedia article on Rayleigh scattering and came upon this: "...the major constituent of the atmosphere, nitrogen, has a Rayleigh cross section of 5.1×10^(−31) m^2 at a wavelength of 532...
View ArticleMagnetic permeability of air compared to ferrous materials
The answer I'm hoping to achieve from this discussion is how high a field applied to air has to be in order for it's magnetic flux to match the magnetic flux of a ferrous material. As you may know,...
View ArticleMotion of a ball along a groove on a rotating disk
Will a ball placed tightly (radius of ball=width of groove) in a groove(length of grove along radius) on a rotating disk have any motion along the groove. The frictional force is zero.
View ArticleOrbital Mechanics Question - Speculative
Hello, I am not a physicist or a physics student. I am an author, and I am trying to see if a Trinary star system I've dreamed up could work, and if so, what are the details as applies to my book. I...
View ArticleCenter of Gravity and Centrifugal Force
Hi, I have this problem that I'm trying to solve and it has been a few years since I've taken Physics. I want to know how you would approach and solve this problem, and what equations you would use....
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