Synchronized coupled harmonic oscillation
Given a general solution to the fixed-end two-mass coupled harmonic oscillator(http://teacher.pas.rochester.edu/PHY.../Chapter12.pdf), is there a set of initial conditions for position, velocity, the 3...
View ArticleWater in evaporative cooler reservoir looses heat?
A typical evaporative cooler works by pumping water from a reservoir in the bottom on the cooler onto fiber pads. A squirrel cage blower sucks outside air over the pads and delivers it into the house....
View ArticleWhy is it important to match frequency to timescale of events?
I understand that too long of a time scale won't resolve an event clearly, and too much has the risk of exciting whatever you're trying to measure. Is there some sort of resonant effect when you match,...
View ArticleQuestion on variable definitions in Paschens law? (breakdown voltage)
Hello all, In the equation V= apd/Ln(pd)+b as described by Paschens law regarding breakdown voltage, I was wondering what the "L" and the "n" stood for. Example of what I'm looking for: p stands for...
View ArticleOptical Gian vs Electrical Gain
Hi, I was wondering what the trade-offs were in having an optical gain (say with EDFA) compared to electrical gain (say with a PIN and transimpedance amplifier) of an optical signal. Thanks.
View ArticleDiffraction by small obstacle
Hi, I'm considering the case of diffraction by an object, with dimensions far smaller than the wavelenght of the light source. If I consider for example an sphere with radius 1nm, or a cube with edge...
View ArticleCar with a balloon
Hi everyone, I was just wondering about this... If I tie a balloon outside a car, using a moderately long string, and the car heads for a left turn on the road with constant speed, then while turning,...
View ArticleExistence of eigenfrequencies
in waves and oscillations i read that any bounded medium oscillates in a particular freuency...why is it so?i need a proper reason for this
View ArticleEntropy increase,coarse-grained vs. Landauer's principle justification
First off, just clarify that I have a very, very superficial knowledge of Physics, so my apologies if my question is based on an obvious misunderstanding of the basic principles underlying the second...
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Dual harmonic oscillators connected by shear spring
Hello everyone, looking around I have faith that the members of this forum will be able to point me in the right direction, and I apologize if it's more basic than I'm giving it credit for. I'm an...
View ArticleSlipping Sphere on Steep Incline
I'm trying to wrap my head around how a rolling and slipping sphere would be behave on an incline (with an angle of θ) that is too steep for pure rolling. I believe I understand the behaviour up to...
View ArticleSurface Temperature of Helmholtz Coil
I am designing a Helmholtz Coil with radius 0.5m with 20 gauge Copper wire having 1000 turns. The power generated by passing 1A current through the coil is around 130W. One coil weighs 15.4kg and the...
View ArticleEnergy requirements of sustaining plasma vs first ionizing it.
Hello all, I was wondering if it takes less energy to sustain an already ionized gas with an electric arc than it does when you are first trying to ionize the gas. I would think it would be, but im not...
View ArticleCode water thermodynamic properties (enthalpy)
Hi everyone, I would like to program water thermodynamic properties in C, C++ or Matlab in order to model a steam power plant. I'm particularly interested in getting the enthalpy of the fluid by...
View ArticleEquations of Motion
In Landau's Mechanics it states "If all co-ordinates and velocities are simultaneously specified, it is know from experience that the state of the system is completely determined and that its...
View ArticlePrerequisites for electrodynamics?
Hi, i've had electrodynamics on my learning to do list for quite some time, but every time i start i get frustrated because it assumes prerequisite knowledge that i dont have. Last time it was...
View Articlecalculating the coherence length of a laser
What is the best way to calculate the coherence length of a laser?
View Articlethe background measure in Boltzmann measure
Suppose a set [itex]X[/itex] describes the possible states of some system, and suppose a function [itex]x\mapsto E(x)[/itex] tells the energy level of each state. At temperature [itex]T[/itex] the...
View ArticleNavier-Stokes Equations
Hi, Stupid question: the Navier-Stokes equations, do they only consist of the equations for a statement of the conservation of momentum or do they also include the equations for conservation of mass...
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EM fields from an accelerated charge: something doesn't add up?
I have seen on several books that the expression for the E field generated by an accelerated charge, at enough distance and in the non-relativistic aproximation, is something like that (taken from...
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