Mathematical interpretation of work done by a gas
Hello everybody! First of all, I would like to say that this is my first post in this forum, even though I've occasionally read some posts before. I'm a ChemE major from Mexico! I am currently taking...
View ArticleGibbs thompson effect
For a droplet of radius r in a vapour phase the Gibbs thompson effect applies: Δμ = μvapour-μdroplet = 2σM/r, where M is the molar volume of the molecules in the droplet and σ is the surface energy....
View ArticleSelf Energy of a thin insulating cylinder
Any idea how to approach finding the self energy of an infinitely long, thin insulating cylinder. It's got linear charge density so I can probably express the self energy as energy/length. I just don't...
View ArticleDifference Between "Thin" and "Conductive" charge configurations
Is there any difference computationally between say a thin spherical insulating shell and a thin conductive shell ? Can you create a capacitor with two thin insulating shells, one smaller than the...
View ArticleInternal Forces In a System
My high school teacher told me that internal forces of a system do not change the Centre of Gravity of a system. I have doubt regarding this. If internal force is applied to the wall of a system, the...
View ArticleGravitational Energy
In nature, all forces have a limited value, i.e, their effect is reduced if many objects are influenced by that force. Example, the magnetic force experienced by a single iron nail (in a magnetic...
View ArticleDoes Combustion Create a Vacuum?
I've heard that fire creates a vacuum due to the consumption of oxygen. Obviously, combustion results in other gases being released (CO2 and H2O vapor). Some have said that there is no vacuum; others...
View ArticleSingle-Wire 'Circuit' using Displacement Current as a Return Path
So, consider an average shorted capacitor connected to an alternating current power source. This capacitor has a certain capacitance, voltage, displacement current, etc. associated with it. Assume the...
View ArticleHamiltons equations of motion in terms of poisson bracket
In Hamiltonian formulation there is an expression df / dt = { f , H } + ∂f / ∂t where f is function of q, p and t. While expressing Hamiltons equations of motion in terms of Poisson Bracket, i.e if the...
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What is the condition for canonicity?
The question is in the attachment. Thank you, guys! :tongue: Attached Images questions.jpg (50.3 KB)
View Articleelectromagnetic induction
What cause potential difference in the conductor? I mean why the changing magnetic flux induce EMF? I understand the basics but I can't understand it. What I know: there is free electrons on the...
View Articleorders of diffraction
Can diffraction be explained for tilted light arrays or only normal incident lights can have diffraction orders?
View ArticleHarvesting piezoelements
Hello, I am looking for harvesting piezo elements with the greatest possible power output. Can someone give me some links to manufacturers and/or articles and books, please? Thanks in advance.
View ArticleI need some information about hydrodynamics
Hello, I need data (articles and books) about what connection there is between the speed (or the power) of a turbulent flow and the range of vibration frequencies that it can create on the body...
View Articleheat in the molecular/atomic scale
what is the physical meaning -and nature- of heat in the molecular scale? how can molecules emit heat in forms other than EM radiation? i used to think of thermal energy of matter as the vibrational...
View ArticleVelocity dependent potentials in the Lagrangian(Goldstein)
Hi, I'm studying classical mechanics via Goldstein's book, but I don't get the chapter about velocity dependent potentials. He writes: 'Lagrange's equations can be put in the form [itex]...
View ArticleOptics: white object reflection properties
If a red light drops on a red object, we know that all of the red light is reflected, and none is absorbed. But what happens if a red light drops on a white surface, is all of the red light reflected,...
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the magnet mill
Attachment 67676 Why aren't we using this method? :surprised Attached Images 1069356_268930836608537_1331625466_n.jpg (31.4 KB)
View Articleabout a spacecraft trip to the asteroids
This was something I was kicking around and wanted some advice on. Let's assume you had a big spaceship -- the kind you'd use t set off on a trip to the Asteroids, and were willing to take some time...
View ArticleBatteries in a Current
Just doing a couple circuit diagrams, and my brain seems to have shorted: If you have two batteries, but they're oriented where their negative terminals are facing each other (+ -) (- +) and there's a...
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