150 citations
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physics.ed-ph2005★ 23 cited
The conceptualization of time and the constancy of the speed of light
Vasco Guerra, Rodrigo de Abreu
In this work we show that the null result of the Michelson-Morley experiment in vacuum is deeply connected with the notion of time. It can be deduced without any mathematics only f…
physics.ed-ph2005★ 2 cited
Images in Christmas Balls
Eef van Beveren, Frieder Kleefeld, George Rupp
We describe light-reflection properties of spherically curved mirrors, like balls in the Christmas tree. In particular, we study the position of the image which is formed somewhere…
physics.ed-ph2003★ 10 cited
Some Remarks about Variable Mass Systems
Mario J. Pinheiro
We comment about the general argument given to obtain the rocket equation as it is exposed in standard textbooks. In our opinion, it can induce students to a wrong answer when solv…