Faced with the need to teach physics to the visually impaired, in this paper we propose a way to demonstrate the dependence of distance and time in a pendulum experiment to blind students. The periodic oscillation of the pendulum is translated, by an Arduino and an ultrasonic sensor, in a periodic variation of frequency in a speaker. The main advantage of this proposal is the possibility that a blind student understands the movement without necessity of touching it.
O número π em geralé descrito como o valor obtido da razão perímetro por diâmetro de uma circunferência, mas esse número aparece em várias circunstâncias nas ciências em geral, principalmente quando um sistema possui periodicidade. Neste trabalho apresentaremos uma forma de se obter experimentalmente essa constante matemática através da medida da resistência equivalente em uma malha infinita quadrada de resistores. As medidas foram realizadas ao longo do processo de construção da malha usando resistores reais e simulando-os em um aplicativo online. As medidas mostram que quanto maior a quantidade de camadas da malha, mais próximo do valor de π se aproxima. Apresentaremos também, outras as formas alternativas de realizar o experimento. Palavras-chave: Medida de π, Malha infinita de resistores.The number π is generally described as the value obtained from the perimeter per diameter ratio of a circumference. But this number appears in various circumstances in the sciences in general, especially when a system has periodicity. In this work we present a way to obtain this mathematical constant experimentally by measuring the equivalent resistance in an resistors infinite square grid. Measurements were made throughout the fabrication process using real resistors and simulating them in an online application. The measurements show that the greater the number of layers of the mesh, the closer the value of π is reached. We will also present other alternative ways of performing such an experiment.
We present an Arduino approach to collect pressure and temperature data from electronic sensors. Using a constant volume-metal-vessel immersed in a water bath and changing its temperature, we measure the pressure as a function of the temperature inside the vessel. With this apparatus, it is possible to demonstrate Gay-Lussac's law. Based on measurements of pressure and temperature we can establish the absolute Kelvin temperature scale.
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