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Finding the air cavity resonance of a propane tank for a drum.
I am going to build a drum out of a propane tank. I think it will be handy to find the resonant frequency of the tank and choose the tuning accordingly so not to pick frequencies that are extremely...
View ArticleCreation of Rotational K.E.?
I was thinking about using a power drill to spin up a gyro. Let's say this gyro has two segments, a wide center and narrow ends. And its a perfectly rigid body. When the power drill is placed at the...
View ArticleWhat is going on inside my magnets?
Hi All, I'm currently trying to make a diamagnetic levitation system for manipulating microdroplets for my Ph.D. As I was carefully grinding down my magnets to an appropriate size I noticed that the...
View ArticleDielectric Sphere in Time Varying Field
Hi, I'm interested in how a dielectric sphere effects a (spatially) uniform time varying field. I'm sure I'm not the first to inquire about this very topic. Could anyone direct me to a resource? Thanks,
View ArticleImpossible electric fields examples?
I was trying to think of more impossible electric fields than my book has. I understand it is anything that breaks the rule that the path integral is zero. One example is a circular field. I was trying...
View ArticleSimple sinusoidal wave can't convey information?
Hello, Here http://www.mathpages.com/home/kmath210/kmath210.htm it is written that "...in order to actually convey information, a signal cannot be a simple periodic wave...". I've met this statement in...
View ArticleGolf ball backspin.
Golf balls are dimpled to give the ball some grip on the air. Backspin is usually highly desirable as it increases lift and hence further distance. But why? Could it be that the friction of the ball...
View Articlehow to transform 2vdc to 240vac
i have just recently discovered peltier devices which make electricity from the Seebeck effect. one video on you tube showing peltier device producing about 2 volts from a flame. i would like to know...
View Articleray tracing - how to numerically integrate the equation of the ray
In a continuous isotropic medium having refractive index n, (not constant) the ray path can be described by the following equation d/ds(n dr/ds)) = grad (n) with an obvious meaning of the symbols (for...
View ArticleHow do thermocouples work?
Hello there! I am planning to do an experiment on thermocouples but have a few questions. 1. What is the physics behind why the thermocouple works? 2. Why do two different metals need to be used for...
View ArticleHistory of measuring g
Hi, I have to write a report on measuring g using a simple pendulum and I wanted to get a bit of the background. I understand that a pendulum was the best way to measure g up until about a century ago...
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Skin effect of transmission line
I have to thinking about how the skin effect come into play in transmission lines with two conductors and dielectric in the middle. For normal skin effect, we consider a potential across a conductor as...
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Statically indeterminate beam (fixed ends) and the moments at the supports
I'm working through my professor's solution for this problem, and I don't understand how he comes up with the reaction force at B without taking into account the moment at B. Any help would be greatly...
View ArticleOptics functions in life
Hi, could you please introduce me anythings thats related to optics items function in life? books,magazins,movies anything... even good pictures for understanding...(I mean for example you tell me type...
View ArticleNormal force in circular motion
Hi, Suppose we have a fellow on a ferris wheel. Would the normal force be greater on the top or at the bottom of the ferris wheel? I'm thinking that it would be greater at the top, or am I wrong? Thanks,
View ArticleVelocity w/axis vs without
Hi, quick question I've just started to learn circular motion and i tried a basic force problem. Imagine there is a ball on a string with a string length 'r', and a ball mass 'm'. You apply a force 'F'...
View ArticleProving Rotational K.E. Formula?
The total kinetic energy (as viewed from one inertial frame) of a free, rigid body is the sum of all the infinitesimal kinetic energies of the components that comprise the body. How do we prove that...
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Electrostatics: Surface charge density-numerical solution
Hi, I'm very new here, 10min old, but the problem with my knowledge, or better, lack there of, at this time is very hard, so I need help. I am trying to numerically calculate a certain electrostatic...
View ArticleGauss's law for electrodynamics
Gauss's law can be proved qualitatively by proving that the field inside a charged closed surface is zero. However Maxwells' equations says that gauss's law holds true even for electrodynamics. how can...
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Measuring the Speed of Light (Foucault Method)
Abstract In this experiment, a beam of light from a laser was reflected off of a rotating mirror to a fixed mirror, and then reflected back to the rotating mirror. The returning light was focused to a...
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