Simple Thermodynamic extremum problem
Suppose I have a cylinder with a movable partition inside, separating it into two subsystems. The partition is movable, but will not transmit heat or matter. The same type of gas is contained in each...
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entropy change during wet compression
I have a quick question. Consider the process S2 to S1 in the figure below Since this represents wet (isentropic) compression, mathematically we have ΔS=0 (assuming adiabatic compression). But if we...
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Wave equation for a standing wave - clarification needed
Attachment 58158 Both of the highlighted equations deal with a standing wave. However, they are slightly different in the sense that the latter has a phase shift in it. Why ? Also, how does one go from...
View Articlea question about optics
I read in a book!If the electrons emit a light wave which is 90° out of phase with the light wave shaking them, it will cause the total light wave to travel more slowly. BUT I don't know why???anybody...
View ArticleCoulomb's Third Law of Friction
According to Coulomb's third law of friction, the sliding friction if independent of the sliding speed. But if the sliding speed is very slow, wouldn't the sliding friction be more? The object's...
View ArticleAcoustic communication impossible in even-D
Arnold, an in interview with Lui in Notices of the AMS, Volume 44, no 4, p432 says: "It is a far-reaching generalization of the well-known fact of the impossibility of acoustic communication in the...
View ArticleSurface impedance - Boundary condition
Hello!! Let a plane wave propagate towards the -y direction. It is normally incident upon the plane [itex](x,z)[/itex] (whose normal unit vector is the y-direction unit vector,...
View ArticleHaving trouble with Rocket concepts
Hello, I am trying to investigate single-stage rockets and I've come across a particular situation I don't know how to handle. The situation I have is that the rocket in question is burning it's fuel...
View ArticleAbout electrification
Hi, coleagues. I'd like to hear others' opinions regarding these: a. why we don't get electrified when just touching an exposed conducting wire, despite the fact that current does flow thru us ? (while...
View ArticleElectromagnetism coupled with continuum mechanics
Are there any textbooks on something like this, a self consistent treatment of classical electromagnetism (relavistic is fine too) where the field equations are solved alongside with the matter fields.
View ArticleTransmittance/reflectance curve for transparent polymer
Dear all, Would you suggest me where I can get the above-mentioned curves for material like Polycarbonate and Acrylic or any other polymer material? Am looking at 0.8 to 3.0GHz Look forward to hearing...
View Articlepoisson brackets
l know you can define poisson brackets between two analytic function in several variables f(q1,q2,q3,..,p1,p2,p3,..) and g (q1,q2,q3,..,p1,p2,p3,..) only by foundamental poisson brackets and their...
View Articlemove A-->B ...What about entropy change?
Hi, I have a physical question regarding entropy, temperature, internal energy and mechanical energy. The situation is following: Two objects are located inside a one dimensional frictionless and...
View ArticleQuestion about Classical mechanics John R. Taylor
In Taylor's advanced text on classical mechanics, he gives an example of a non-holonomic system, I find this part very strange. He gives the example of a hard rubber ball being rolled in a triangle on...
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Torque transfer via bar - Mechanics
A friend of mine asked about this problem and I'm wondering if anyone has any advice or tips how to solve it. 1. The problem statement. (picture attached) Two bars L1 and L3, connected to two walls,...
View Articleside-by-side quarter wave plates
Can anyone help out with the following question? Suppose we have an incident linearly polarized plane wave, polarized in the z-direction and propagating in the x-direction, and it passes through two...
View ArticleBuilding an electro magnet
Hey guys.. I trying to build an magnet which can pull an object with 5N.. I am using S37 as my the iron for my horseshoe magnet, And been using this formula to convert Newtonian Force to magnetic force...
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Using Mathematica to Model a Source and Vortex
Hey guys, I'm not sure if this is the right place, but I'm trying to use mathematica to model a vortex. I think I have the math right. I did a summation of stream functions, but as you can see,...
View ArticleIs there a certain limit of force to a magnetic field?
Heyo! Okay, I always assumed when two "magnetic" objects attract/repel there is always a limit to how much force! Each magnetic object applies. Say you have a ceramic magnet and a electromagnet. You...
View ArticleDetermining resistance of oscilloscope.
Hi, I'd appreciate some help in determining the internal resistance of the oscilloscope Agilent DSO1002A. Based on the user's guide the input impedance is: 1 Mohm ± 1% || 18 ±3 pF, but another...
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