Electric intensity
It is written in my book that the Electric intensity is the amount of electric charge which passes in one second. I think the definition is incomplete, I mean it didn't mention the sector that it...
View ArticleDropping an Object of Mass
I have always known that weight is the force of gravity. Yet I have always been confused about one thing. If you hold up an object of mass and drop it, wont the ground experience a force that is...
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Magnetic dipole-dipole interaction model
Hello, I'd like to calculate magnetic dipole-dipole interaction energy. Actually, I've tried to find models for the calculation, but most of them are just a simple point dipole-dipole interaction...
View ArticleDirac Delta source for vectorial equation
Hello! By manipulating Maxwell's equation, with the potential vector [itex]\mathbf{A}[/itex] and the Lorentz' gauge, one can obtain the following vector wave equation: [itex]∇^2 \mathbf{A}(\mathbf{r})...
View ArticleUniqueness of Maxwell's equations
Hi all, I'm trying to derive for myself the uniqueness proof for Maxwell's equations, but I'm a little stuck at the end. I've managed to prove the following: [tex]...
View ArticleGenerating Functions in Hamiltonian Mechanics
Hi I have been looking at canonical transformation using generating functions. I am using the Goldstein book and it gives the following example - F1=qQ ⇔ Q=p and P=-q F2=qP ⇔ Q=q and P=p F3=pQ ⇔ Q=-q...
View ArticleCoriolis effect and base forces
I wonder if anybody can point me to a good explication of the atmospheric Coriolis effect broken down into base forces. Most of the explanations I've seen are problematic, even flawed as far as I can...
View ArticleWork Forces
Hello all, I was wondering if it was possible to have energy without an associated force. More specifically, can there be an energy change in a system without a net force? From what I know, this SHOULD...
View ArticleSome questions about sound(sine) waves.
Hi all. I'm a music student and I've been trying to educate myself about acoustics lately. I'm exploring the correlations between two pure sound waves. This might be more of a mathemetical question...
View ArticleDoes the Drude model predict the emission of em waves?
The Drude model of electrical conduction has the charge carriers being accelerated by an electric field and then interacting with the lattice ions. The cycle is then repeated. An unbound charged...
View ArticleBeam profile abberrations
Hi there! I have a couple of questions for you guys about Spatial Light Modulators and laser beam profile aberrations. In the laboratory where I work we have a setup with which we can create a...
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Hollow Sphere Moment of Inertia
I need to find the moment of inertia of a sphere of radius ##r## and mass ##m## about an axis through it's centre. I've already done it and got the correct answer of ##\frac{2}{3}mr^2## however I have...
View ArticleHarmonic motion equations
I was hoping that someone could explain why these different equations can be found from different sources please. The time dependent position, x(t), of an underdamped harmonic oscillator is given by:...
View Articlethermodynamic variables
It seems to me that for some thermodynamic variables it makes sense to talk of systems in contact with different values of these variables. An example is temperature. We can the problem of two systems...
View Articlerotation relative to an inertial frame
Earth has a huge angular velocity regarding its rotation. Now let's imagine that the earth has the velocity of 400 km/s relative to some inertial frame. What will be the velocity of Earth when we take...
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Batteries connected in parallel
What will happen if two batteries were connected in parallel, and how could the total voltage and current be distributed among the resistors? Like in this attachment considering that the internal...
View ArticleF=ma with constant acceleration
I'm new to physics, so I'm sure the explanation is very simple, but I cannot wrap my head around Newton's 2nd law F=ma. It is very easy to understand until I plug 0 into a. Wouldn't this make the force...
View ArticleResonance feedback loop on guitar
Hey guys, I was messing around with my guitar (classical guitar) and my amp lately. I put the treble on lowest, bass highest, reverb highest, mid highest and mid frequency lowest. When I pluck a string...
View ArticleBasic question about energy conservation
Hello I just read this http://io9.com/scientists-just-creat...scl-1526957560 where they explain a new type of revolutionary artificial muscle. The principle of operation is very simple: when a material...
View ArticleGreen light from a uv laser
Ok, so I have a 405nm laser pointer (bluish purple/uv). Had a few miscellaneous glass objects and was shining it through them when I noted a light green line in the glass that it shone through. One of...
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