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Optical effect by kaleidoscope and LED
Hi all, A very simple experiment can make us relax with beautiful scene Using a kaleidoscope, and let a LED source to emit light with red color to the back side of the kaleidoscope. You will see many...
View ArticleD'alembert's Principle
/I'm having some doubt with D'alembert's Principle. The principle states that [itex] \sum_{i}(\vec {F}_i - \dot{\vec{p}}_i)\delta\vec{r}_i=0[/itex] but does that mean that each term of the summation...
View ArticleNormal Force and Atmospheric Pressure
1. Suppose a cube of mass m is lying at rest on a horizontal surface. The area of one face of the cube is A. For the equlibrium of cube no net force acts on it. If we consider the vertical direction...
View ArticleMagnetic Force and Work
Two long parallel wires carrying current I attract each other. Let's say we let them free to move then they will accelerate towards each other, thereby increasing the kinetic energy of the wires. But...
View ArticleRelation between wavefunction of the photon and the Four-potential
Hey! Maybe this is a "piece of cake" question, but here is the thing, i have the Maxwell equations in the Lorenz gauge are \begin{array}{c} \partial_{\mu}\partial^{\mu}A^{\nu}=\mu_{0}j^{\nu}...
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Magnetic Flux Density vs Magnet Geometry
Attachment 61559 Gentlemen, the the image shows 2 N48 neodymium magnets of the same volume 54 in2. On several website I can use magnetic flux density calculators to get the Br of the rectangular...
View ArticleDetermining the Action of the Electromagnetic Field - Examples
In Landau Volume 2 (page 71) an expression for determining the entire electromagnetic Lagrangian is given. What would be an explicit numerical examples of working this idea out along the lines Landau...
View ArticleElectric field due to current carrying wire
What is the electric field due to a current carrying wire? In a Griffiths EM problem, he treats the E field outside a current-carrying wire as if it were due to a static charge distribution. Is this a...
View ArticleTrampoline Physics
Hello, I want to write code for a 2D trampoline simulation and try to understand the physics behind it. After a lot of googling, I think I understand the whole stuff regarding potential/kinetic energy...
View ArticleCentripetal Acceleration of an Ellipse
The centripetal acceleration of a circle is: [tex]a_c = \frac{v^2}{r} * u_n.[/tex] The acceleration of an ellipse is different. It increases from from apoapsis to periapsis as the position changes from...
View ArticleRotational speed at axis of rotation?
Hello everyone! This is probably the stupidest question that I've come up with, and I'm a little embarrassed asking it, but here goes: Is it only the tangential speed that is zero of a point at the...
View Articlewhy can I see light from TEM00 laser in direction of propagation?
In my lab I have a TEM00 laser, so there is no electric or magnetic field in the direction of propagation (call it z direction). However, I know that the intensity of the laser is greatest when my eye...
View ArticleAmpere Circuital law proof
Where can I find a proof for the Ampere Circuital law? Wherever I look, I just find a proof for an infinitely long current carrying conductor.:confused:
View ArticleStatistical Physics
Please help me, what are micro and macrostates, what are accessible states?
View ArticleClassical Model Electrodynamics
Hi, I am trying to gain a better understanding of the classical model of electrodynamics, so what I mean by this is, using the idea of dipoles and electron movement to understand electrodynamics. More...
View ArticleProjectile motion with air resistance
Without air resistance, bodies travel in a parabola. What is the curve that is travelled when air resistance is included? I found that there are different air resistances, which curves would these...
View ArticleFlux Through a Sphere Containing a Dipole
So I am probably understanding something wrong but would gauss's law [itex]\frac{Qinside}{\epsilon0}[/itex] for a sphere surrounding an electric dipole, with a point charge just outside of the sphere....
View ArticleInverse matrix mass computation
Hi ! I've been thinking this problem a whole and I could not find an answer. I want to solve the following problem: suppose I have [itex]N[/itex] mass particles with absolute coordinates [itex]...
View ArticleTemperature of shipping container
How do I calculate the surface temperature of a shipping container's roof over 24 hours? All weather and sun parameters are known and I use an energy balance equation, but the contribution of the...
View ArticleDetermining heat loss and required insulation
Howdy everyone, I'm sorry if this is in the wrong forum, but since I believe it is mostly a thermodynamics problem I think this is the right arena. My questions stems from trying to insulate a bank of...
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