Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2018, Tutor: Josep Llosa Carrasco
The aim of this project is to find the \proper length" of the thread in both the tough and the mild variants of Bell's spaceship paradox. To do so, a method for measuring the proper length of an accelerated object needs to be proposed. It is developed and applied to both variants, and then, the results are compared.