2021
DOI: 10.1250/ast.42.193
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The Euler disk and its dynamic finite time singularity: Investigating a fascinating acoustical and mechanical phenomenon with simple means

Abstract: Many have spun a coin or other disk on a table, observing -and listening! -thatwhile its motion comes to rest, the angular velocity of the contact point and the frequency of the emitted sound raise in a striking way. This dynamical system is known as the ''Euler disk,'' and its physics is theoretically understood as a ''finite time singularity'' in form of an inverse power law. Various dissipation mechanisms lead to different exponents in the power law. The present investigation is about different configuratio… Show more

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