10th International Physicists' Tournament - Grand Finale

Grand Finale of the 10th International Physicists' Tournament The teams of France, Switzerland and Brazil are meeting each other in the Grand Finale of the Tournament. -Brazil discusses the realization of an acoustic black hole, out of which no sound can escape ("Sonic black hole", problem #6) -France talks about the strange sound produced by an hex nut in a balloon ("Screaming balloon", problem #9) -Switzerland explains how to construct a loudspeaker without any moving part ("Static speaker", problem #2). Exact problems: http://2018.iptnet.info/problems/ And of course, the Physics Fight begins by the traditional Captains Fight! Official website: http://2018.iptnet.info. Facebook: https://www.facebook.com/InternationalPhysicistsTournament/ Twitter: https://twitter.com/IPT_Official