Risultati della ricerca
Anno XXXIV - n.2 - aprile/giugno 2001 Studio sperimentale della caduta di una sfera in aria, con le possibilità offerte dalle nuove tecnologie
In this article we describe on-line experiments involving spheres falling in air, using graphic calculators connected to CBL units and distance sensors, which permit a quick acquisition and analysis of the experimental data. Comparing the motion graphs of a billiard ball and a light polystyrene sphere, […]
Anno XXXIV - n.2 - aprile/giugno 2001 Un metodo dinamico per la determinazione della costante dielettrica di un liquido
In order to find the dielectric constant of an insulating fluid the authors measured the resonance frequency of a parallel plate capacitor that had the fluid as dielectric. The results show that the method is suitable but some improvements are needed to increase the experimental sensitivity. […]
Anno XXXIV - n.2 - aprile/giugno 2001 Argomentare su temi scientifici nella scuola
One of the declared aims of school science is to help the students gain some basic abilities for a fully aware citizenship. For example science can provide some tools for judging the acceptability of incoming information and for deciding and acting socially and as individuals. […]
Anno XXXIV - n.1 - gennaio/marzo 2001 Analisi del funzionamento di un orologio ad acqua
In this paper the author presents a discussion of the characteristics of a simple water clock built with a tin. Starting from experimental measurements, the emptying of the tin is theoretically described as a simple exercise. The theoretical result is tested on the experimental data and then used as model for the discussion. […]
Anno XXXIV - n.1 - gennaio/marzo 2001 Il moto dell’altalena: un gioco antico studiato con tecnica moderna
See-saw motion is investigated using an on-line data acquisition system made of TI89, CBL, and a motion sensor (sonar). Two cases are considered: the twin-edges pivot and the round pivot. We discuss the different behaviours that lead either to strongly anharmonic or to nearly harmonic motions. […]
Anno XXXIV - n.1 - gennaio/marzo 2001 La rifrazione della luce in un mezzo non omogeneo
This paper illustrates an experimental device in which light propagates in an unhomogeneous medium, that improves the understanding of looming and mirage phenomena. The experiment is easy to put into practice; the required materials are low-cost and readily available. […]
Anno XXXIV - n.1 - gennaio/marzo 2001 “Sperimentare” in un Istituto d’Arte: conduzione nei liquidi
Physics and chemistry are compulsory subjects in the last years of the Arts and Crafts studies but many students assign a much greater importance to the more professionally oriented subjects. This article shows how the collaborative teaching of chemistry and physics in the field of electrochemistry can motivate the students and improve their attitude towards science in general. […]
Anno XXXIV - n.1 - gennaio/marzo 2001 Le code delle comete: effetto delle forze di radiazione
The combined effects of the Sun’s gravitational attraction and of the pressure of radiation allow to calculate the maximum dimensions of electrically neutral dusts in one of the tails of a comet. […]
Anno XXXIII - n.4 - ottobre/dicembre 2000 Il teorema di Carnot e il rendimento delle macchine termiche
Carnot’s theorem, which plays a central role in thermodynamics, is usually exposed in textbooks in an unsatisfactory way, which does not stress adequately the unique status of Carnot’s cycle. Moreover, the core of this theorem, that is the concept of thermal efficiency, […]
Anno XXXIII - n.4 - ottobre/dicembre 2000 La bicicletta di Einstein
The physics of bicycle riding lends itself to simple discussions that might be useful for teaching. The article offers two examples on curving. The first example concerns the relationship between the radius of the curve, the angle the handle bar is turned and the length of the bike. […]