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Is a reaction moment/force created in off-center constrained rotation?
Assume that the arbitrary-shape object shown has a torque applied at the black X with a circle, and is free to rotate about the X axis. Assume that the object is also constrained by a pin at this...
View ArticleDoes a pyroshock force distribute in a system?
Does a shock wave have a finite value that can be shared within a system? For example, if I explode a some dynamite (~10000 G) under a car as a shock test, does the force of the shock wave enter the...
View ArticleUsing Radio Antennae to Dump Stored Energy
So, let's say a spacecraft at a large distance from any star needs to dump a tremendous amount of stored electrical energy overboard in a limited timeframe. Normally, spacecraft dump excess/waste...
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Pressure differential and air flow
I'm having a hard time understanding air flow caused by pressure differentials. Given the following contextual image, crafted by myself: Bare with me here, these are two interconnected boxes open to...
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Michelson interferometer
Since 2 splitted beams meet at ONE spot later on, we have just one beam which flows to the detector, therefore I expect to see just one light spot, where the BRIGHTNESS is changing depending on at...
View ArticleAre current-carrying wires made of dielectric material?
Here is an excerpt from my textbook: "Ordinarily, this charge would simultaneously generate so large an electric force as to swamp the magnetic one. But if we arrange to keep the wire neutral, by...
View Articlegraphs of electric field due to binary charge configuration
sir in the graphs of electric field due to binary charge configuration why some curves are below x axis and some are above x axis
View ArticleThree models of light
Hello experts! I was taking class of optical fiber and communication. My teacher was teaching the class via projector and slides (transparencies). He taught us light models and he just changed his...
View ArticleWhy do we consider induction a way of charging?
I get that by getting a charged object near an uncharged one, charges of the opposite sign are induced on the surface, but, since the total charge of the whole object is still zero (because electrons...
View ArticleRadius of curvature of planetary motion
Suppose we have a planet of mass m orbiting a larger one of mass M along an elliptical path. If we use polar coordinates with the origin placed on the planet of mass M (focus of the ellipse) then at...
View Articleinfluence of magnetic fluid in magnetic force
Looking for a way to increase magnetic forces in electrical devices, an option is reduce the air gap, but some times it is not a practicable solution. The question is what happend if we put a...
View ArticleGroup velocity dispersion and normal, anomalous dispersion?
From my understanding, normal and anomalous dispersion are because the phase velocity is a function of k so it is different for different components of a group so the group will spread out over time....
View ArticleThermophysics: Independent variables, state functions, constraints
Hi. Btw: I haven't studied statistical physics yet, but I have studied the introductory course on thermodynamics. I've recently been reading Howard Reiss's book on thermodynamics (it's from the 60s) in...
View ArticleAccelerating a micron size particle in an air stream
Hi, I have a 1m long, 10mm ID vertical tube attached to a vacuum system. I have a known flow rate of the air down the tube which is used to calculate the air velocity. My question is if I then add...
View ArticleInfinitesimal transformations and the Hamiltonian as generator
Helloo, I don't understand how one arrives at the conclusion that the hamiltonian is a generating function. When you have an infinitesimal canonical transformation like: [itex]Q_{i}=q_{i}+ \delta...
View Articlean expression about kinetic energy
Hi, all. Here is an expression about kinetic energy from analytical dynamics of Haim Baruh which confuses me. "Consider a particle and the case which the kinetic energy is only quadratic in terms of...
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work-energy principle and conservative forces
Hi, all there are equation in the pic but I cant understand them. I know work-energy principle which is W= F * X (work equals force times way) but I think they are special forms. What concepts and...
View ArticleLiouvillian operator
Hello, who can suggest me a book, or a PDF where i can find an introduction to Liouvillian operator in statistical mechanics? I understand that it's correlated to time evolution of density of an...
View ArticleWhat is the Torque at the rear wheel in this gear setup ?
Dear Experts A bicycle has the following gear setup. I like to get your advice what is the effective gearing and torque at the rear wheel that is being turned by a electric motor that is turning the...
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