Classical Physics

L’aberration Stellaire au XVIIIème Siècle (Stellar Aberration in the 18th Century)

Authors: Jean-jacques Sainthuille
Comments: 5 Pages. In French

L’article remet en question le raisonnement de James Bradley justifiant l’inclinaison d’un télescope pendant l’observation d’une étoile fixe à une époque où le temps et l’espace étaient absolus. Nous plaçant dans le contexte révolu, la courte démonstration repose essentiellement sur quelques dessins explicites.

The article challenges James Bradley's reasoning for tilting a telescope while observing a fixed star at a time when time and space were absolute. Placing us in the bygone context, the short demonstration is essentially based on a few explicit drawings.
Category: Classical Physics

Photon, Mass and Gravity-Chapter About the Gravitational Force

Authors: Oliver R Jovanovic
Comments: 2 Pages.

One of the major consequences of the rest mass reduction in the gravitational field are new equations for the gravitational force and acceleration.
Category: Classical Physics

Antena Esférica Con Bobina Espiral (Spherical Antenna with Spiral Coil)

Authors: Carlos Alejandro Chiappini
Comments: 8 Pages. Contacto: carloschiappini@gmail.com

Esta antena tiene irradiante de 613 mm y geometría esférica. El diseño ha evolucionado desde la primera versión, que solamente tenía 4 meridianos, hasta la versión de este documento, con 4 meridianos, ecuador y bobina espiral. Aunque es parte de un experimento, realmente sirve para operar en VHF. El diámetro de la esfera es 52 mm.

This antenna has a 613 mm radiant and spherical geometry. The design has evolved from the first version, which only had 4 meridians, to the version in this document, with 4 meridians, equator and spiral coil. Although it is part of an experiment, it really serves to operate on VHF. The diameter of the sphere is 52 mm. Whoever wishes to achieve SWR=1 on the entire band can add a 104 mm diameter sheet metal circle, which advantageously replaces the radfials. In my case, the circle has a 15 mm hole in the center, to be able to clamp it between the male PL259 connector and the female PL259 of the downstream coaxial, when I use the fixed antenna at home. The circle is well trapped between both connectors and well connected to ground.
Category: Classical Physics

Intrinsic Angular Momentum of Classical Electromagnetic Field

Authors: Jouni Puuronen
Comments: 12 Pages.

We study the question that does classical electromagnetic field have intrinsic angular momentum, and we find a surprising result that it is not possible to answer this question. We also go through how the quantity "epsilon0 E cross product A" can be used as the intrinsic angular momentum density of classical electromagnetic field.
Category: Classical Physics

The Actuality of Acousto-Mechanical Resonances for Noise Control

Authors: Roman Vinokur
Comments: 7 Pages.

A clarifying analytical study was done for the 2-DOF acousto-mechanical system modeled as the Helmholtz resonator with elastic vibrating bottom. Generally, such a system has two resonances that can generate and radiate an annoying tonal noise. As shown, the two resonance frequencies may get very close with mutual amplification and even merge together into one powerful resonance (a close-form equation describing this transition was derived). Such an effect can happen because the mass of air in the neck and the rigid mass may differ in several orders of magnitude. This is less possible in 2-DOF mechanical systems where the masses of both vibrating rigid bodies are commonly within one order of magnitude. The results may be helpful in particular for noise identification and reduction in blowers and other air moving devices. Here, the role of a vibrating bottom is played by the impeller in combination with the rotor and suspension system, and the air inlet (or outlet) serves as the Helmholtz resonator neck. Low-frequency acousto-mechanical resonances can also occur in rooms with open windows or doors.
Category: Classical Physics

The Informational Model — Gravity and Electric Forces

Authors: Sergey V. Shevchenko, Vladimir V. Tokarevsky
Comments: English: pages 1-25, Russian 26-53

In the 2007 "The Information as Absolute" concept it was rigorously proven that Matter in our Universe — and Universe as a whole - are some informational systems (structures), which exist as uninterruptedly transforming [practically] infinitesimal sub-sets of the absolutely infinite and fundamental "Information" Set. The conception has enabled to suggest a reasonable physical ("informational") model that is based also on outstanding von Weizsäcker’s 1953-54 year "Ur-hypothesis" and Fredkin-Toffoli 1960-th year finding, where so the ultimately basic binary reversible fundamental logical elements (FLE) that constitute the ultimate base of Matter — the [5]4D dense FLE-lattice, where material structures (e.g., particles) and fundamental forces’ mediators exist and act, are postulated. The model yet now solves and makes clearer more 30 fundamental problems in physics; including, enabled to put forward rather reasonable 2007 initial models of the Gravity and Electric Forces in statics, where the Forces’ mediators are real — i.e. by no means virtual - disturbances in the Matter’s ether, as that particles also are. In this paper the recent versions of the models, including description of free fall motion of gravitational test mass in Gravity field and of motion of electric charges, is presented, where it is shown that in any field no singularities are created, and so rather probably it is possible to obtain at least zero approximation description of motion of masses in extreme gravity fields, including below event horizon in SMBH, etc. As well as it is rigorously shown that both — Gravity and Electric Forces fields have no energy and energy density, don’t interact specifically independently on charges with anything in Matter, so there is no "electromagnetic" masses, etc.; besides the models explain why the inertial and gravitational masses are equivalent, the fundamental puzzle why αћc~e2/4π, why magnetic monopole doesn’t exist, etc.
Category: Classical Physics

The Classical Theory of Dark Matter and Dark Energy

Authors: Yuri Mahotin
Comments: 4 Pages.

Using the principle of least action, we have obtained the four dimensional tensor of mass. Diagonal elements of mass tensor represent the usual mass, time components of that tensor represent components of dark matter, and space components are components of dark energy. According to the new theory, photons make a contribution to dark matterand dark energy.
Category: Classical Physics

Absolute Rotation of the Foucault Pendulum

Authors: Russell p. Patera
Comments: 14 Pages.

The absolute rotations of the Foucault Pendulum and its mounting fixture were derived for any latitude and Earth rotation angle. A theorem in attitude kinematics was used to obtain analytical solutions for both rotation angles and rotation angle rates. Both pendulum and mounting fixture were found to have absolute rotation rates in the counterclockwise direction in the Northern Hemisphere. The difference in rotation rates is in agreement with the observed relative clockwise precession rate of the pendulum with respect to its mounting fixture in the local Earth reference frame. The results were validated with an alternative kinematic method.
Category: Classical Physics

The Maxwell’s Equations in Geometric Algebra Cl (3,0)

Authors: Jesús Sánchez
Comments: 17 Pages.

In this paper, we will obtain the Maxwell’s equations using Geometric Algebra Cl3,0 (three space dimensions and the time as the trivector of the Algebra). We will obtain the equations with all the possible elements that exist in this Algebra. We will get as new elements the Electromagnetic Bivector Bxyz and the ones related to the angular momentum of the charge (in relation to its rotation or helicoidal trajectory).Considering these new elements zero or oscillatory with a zero average, we get the standard Maxwell’s Equations (both in its covariant formulism and in standard vector algebra.)
Category: Classical Physics