Risultati della ricerca
Anno XXIX - n.4 - ottobre/dicembre 1996 Massa inerziale e gravitazionale: aspetti storici e didattici
In the study of Mechanics, both at secondary school and university levels, the conceptual distinction between inertial and gravitational mass is often hurriedly discussed with the aim of unifying the two quantities as soon as possible. Fundamental contributions to the clarification of the distinction between the two quantities and to increasing the accuracy of the experiments to check their proportionality were given by great physicists as Newton and Einstein, […]
Anno XXIX - n.4 - ottobre/dicembre 1996 Determinazione della costante di Boltzmann attraverso misure dinamiche di moti browniani
A simple check of Einstein – Smolukowskij law was performed. The observation and measurement of brownian motion is possible through a video recorder- television set. […]
Anno XXIX - n.4 - ottobre/dicembre 1996 Magia con la luce
This note describes an alternative classroom demonstration of Newton’s classic method to mix, by means of a prism, rainbow colours to get white light again. […]
Anno XXIX - n.4 - ottobre/dicembre 1996 I problemi assegnati alle 28e Olimpiadi Russe di Fisica (1994)
In Russia there’s an old and consolidated tradition associated with Physics problems and exercises for students, as the very famous section “Zadaci po Matematike i Fizike” (“Mathematics and Physics problems”) of “Kvant” magazine shows. This article presents all the problems on various school levels that were assigned during the 28th Russian Olympiads for Physics (1994), […]
Anno XXIX - n.4 - ottobre/dicembre 1996 I problemi delle Olimpiadi di Fisica portoghesi
Lately the interest in International Olympiads for Physics has been greatly increasing throughout Portugal. As a matter of fact, the Portoguese Physics Society (SPF) signed a document concerning a formal agreement with Portugal central Government for the organization of Regional and National selection tests. […]
Anno XXIX - n.3 - luglio/settembre 1996 Entropia e informazione nell’opera di Léon Brillouin
After the second world war, the birth of cybernetics and information theory gave rise to new conceptual tools for exploring the meaning of entropy and understanding its relation with information. The key scientist who exploited in a systematic way the relation between entropy and information was Léon Brillouin. […]
Anno XXIX - n.3 - luglio/settembre 1996 La potenza della suggestione
About one hundred physics textbooks have been examined in this article to research the answer given to a simple question of hydrostatics shown in fig. 1. The number of wrong answers turned out to be surprisingly high. […]
Anno XXIX - n.3 - luglio/settembre 1996 Un esperimento sulla dissipazione in un sistema meccanico
A simple dissipative mechanical system is discussed in order to introduce, at high school level, the basic ideas on which are founded some typical experimental techniques concerning condensed matter. Some reflections are made concerning the passage from a macroscopic description to a microscopic one. […]
Anno XXIX - n.3 - luglio/settembre 1996 L’emissione di luce della lampadina da bicicletta
A series of three simple experimental activities with bycicle lamps allows a determination of the temperature of the filament, an evaluation of the light emission of the lamp. and an examination of the law for the dependence of the illumination on the distance from the source, […]