Calcuating energy from Air Tank
Hi, I was working with my Air compressor today and was wondering if there is a way to calculate the amount of work or energy that is stored within a air tank? The air compressor is a 2.5hp, 112L/m...
View Articlea phenomena i cant fully understnad
when i rotate a screw at low speed he stop after sec. but when giving him high initial speed he rotate,stop,and rotate backwards and stop again. i think its because the drag force which got 2...
View ArticleEquation Of State
It is known that the combination of (p, v, t) gives Equation if State. Okay, what if we have the intervention of the internal as well, i.e, U=cte*PV for example. Can this be also considered as an...
View ArticleScattering of an unpolarized photon off an electron
Hi all! I have been told that if an unpolarized photon hits an electron in a Thomson scattering the outcoming photon will be polarized because of the electron's spin. I didn't understand what it means,...
View ArticleHow to calculate electric charge with a given electric potential?
Hi! An iron plate with a mass of 1 kg surrounded by vacuum has an electric potential of +20 kV. How do I calculate the charge, Q of the iron plate? I have all the information I need, right?
View ArticleSolving 2nd ODE for RLC circuit
This is really more of a mathematical question than physics. Given a RLC circuit, I will arrive at the following DE: [itex]\ddot{Q}+\frac{R}{L}\dot{Q}+\frac{1}{LC}Q-\frac{\epsilon}{L}=0[/itex] How do I...
View Articlediatomic ideal Gas
Hi, I try to understand a cycle process with an diatomic ideal Gas. Question: Is it possiblie to use the ideal gas law: [itex]pv=NkT[/itex] for the diatomic gas? I thought it is just for monoatomic....
View ArticleForce on a fixed object-- help settle a debate please!
I was hoping to settle a debate with a friend. He is planning to install a rope climb from the ceiling of his home. The engineers told him that the load rating of the beam that the rope would be...
View ArticleClik here to view.
Calculating the pressure force of a lever roller printing press
Hello Everyone. I need some advice in calculating the pressure of a roller printing machine. The machine is operated by a geared rotating lever which moves the impression roller across a print surface....
View ArticleMagnetosphere
Hi everyone! Do you have some recomendation books/journal about introduction to Magnetosphere? Thanks before
View ArticleCan Newton's Laws of Motion be simplified?
The three laws are already very simple and basic, any way to reduce them further?
View ArticleIs angular frequency absolute?
In classical mechanics, is the angular frequency of a rotating object, planetary system etc. the same as viewed from any inertial reference frame?
View ArticleMy Version of Laws of Thermodynamics
Hi everyone, Here is my version of laws of thermodynamics which I would like to share it with you and hear your feedback: Zeroth Law: More than being a law, it is a definition for temperature and it...
View ArticleMode of heat transfer between two cubes and to its surroundings
Hi all, I am trying to mathematically proof that one can neglect convection and radiation when two cubes (paraffin-based, 1x1x1cm) are in direct contact on one side whilst the other 5 sides are...
View ArticleWhich equation to use in a Simple Harmonic Motion
Im kind of confused on which acceleration equation to use. A = -(kx)/m or A = -(w^2)Acos[(angular freq)(time) + phase constant] as both of these contribute to SHM. Im guessing I can use the first...
View ArticleClik here to view.
solution of wave equation, 2nd partial derivatives of time/position
f(z,t)=\frac{A}{b(z-vt)^{2}+1}... \frac{\partial^{2} f(z,t)v^{2} }{\partial z^2}=\frac{-2Abv^{2}}{[b(z-vt)^{2}+1]^{2}}+\frac{8Ab^{2}v^{2}(z-vt)^{2}}{[b(z-vt)+1]^{3}}=\frac{\partial^2 f}{\partial t^2}...
View ArticleIs gravity strongest in center?
Is gravity, in sense of pressure, strongest in center of objects like planets, stars, BH, galaxies? If all atoms attract each other then center cannot be it, right? If you had a hole in center of Sun...
View Articleequation -- Wave Equation Derivation Question
Hello, my teacher says that if, on a wave equation [tex]f(x-ct)=f(e)[/tex] then [tex]\partial_{ee}= \partial_{tt}- c^2 \partial_{xx}[/tex] but i think that [tex]\partial_{t}=\frac{\partial }{\partial...
View ArticleHelp solving the vibrating pole mystery.
The online edition of an italian newspaper, reported the curious event of a street pole which seems to vibrate for prolonged times, hours, even an entire day and without any clear reason. Someone talks...
View ArticleADR for Middle School Science fair project (Magnetic Refrigeration)
Hi, I'm curious about doing a middle school science fair project showing how magnetism can be used to cool Gadolinium and thus demonstrate the basis of magnetic refrigeration (ADR). From what I've read...
View Article