Articoli rivista
Anno XXVIII - n.1 - gennaio/marzo 1995 L’analogia idrodinamica e lo sviluppo della teoria elettromagnetica di Maxwell
In 1855 Maxwell developed a formal analogy between the motion of an incompressible fluid, the electric current in a conductor, and the lines of force of a magnetic field. His analysis represents an example of interdisciplinary study of physical phenomena in the past, […]
Anno XLIII - n.2 - aprile/giugno 2010 L’analogo rotazionale
With an educational purpose, the analogy between rotational and translational quantities is explained by comparing the behaviours of a flywheel and of a trolley moving along a rail. The inertia of the two compared systems is measured in the same framework. […]
Anno XLVI - n.1 - gennaio/marzo 2013 L’anello saltatore e nuove storie
The Thomson ring experiment is revisited obtaining higher and higher jumps. The ring’s inductance and the phase lag between the primary magnetic flux and the current are determined using a new procedure. New configurations that produce an electromagnetic cannon that fires aluminium disks are presented. […]
Anno XXIII - n.3 - luglio/settembre 1990 L’astronomia: un’applicazione della fisica
Newtonian gravitational laws explain the motions of planets around the Sun and the motions of double stars around their center of mass. Small deviations from the predictions of these laws have given confirmation of the general relativity theory. Astrophysics, by means of the analysis of the electromagnetic radiation emitted by the celestial bodies permits us to derive the surface temperature of stars, […]
Anno XXX - n.3 - luglio/settembre 1997 L’attimo fuggente: ovvero come verificare la rotazione della Terra in meno di venti minuti
The rotation of the Earth produces an effect on the behaviour of a sufficiently long pendulum, as in Foucault’s experiment in 1851. This article illustrates an easy method to measure the Earth’s angular velocity with acceptable accuracy and in less than 20 minutes. […]
Anno XLIII - n.1 - gennaio/marzo 2010 L’eclisse del 1919 e la teoria della relatività – il ruolo dei pregiudizi
When interpreting experimental results, context is everything. The researchers who took and analyzed the most important eclipse data had good reasons for judging the experiment a victory for Albert Einstein. […]
Anno XLIII - n.1 - gennaio/marzo 2010 L’eclisse del 1919: un esperimento di grande delicatezza. L’accuratezza degli strumenti e le tecniche impiegate furono adeguati?
The debate on the correctness of the 1919 eclipse experiment is still in progress. This paper aims to contribute by analyzing the available data on the instruments, the achievable accuracy versus what would have been necessary and some experimental details not currently available in the relevant literature. […]