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中国的学生物理学术竞赛(CUPT)最新比赛评分标准IYPT2013inTaipei,TaiwanTheIYPT2013willtakeplaceinHYPERLINK"http://iypt.tw/"Taipei,Taiwan.Furtherinformationwillbeannouncedinduetime.CUPT2013将于2013年8月在兰州大学举行。1.InventyourselfItismoredifficulttobendapapersheet,ifitisfolded“accordionstyle”orrolledintoatube.UsingasingleA4sheetandasmallamountofglue,ifrequired,constructabridgespanningagapof280mm.Introduceparameterstodescribethestrengthofyourbridge,andoptimisesomeorallofthem.2.ElasticspaceThedynamicsandapparentinteractionsofmassiveballsrollingonastretchedhorizontalmembraneareoftenusedtoillustrategravitation.Investigatethesystemfurther.Isitpossibletodefineandmeasuretheapparent“gravitationalconstant”insucha“world”?3.BouncingballIfyouholdaPing-Pongballabovethegroundandreleaseit,itbounces.Thenatureofthecollisionchangesiftheballcontainsliquid.Investigatehowthenatureofthecollisiondependsontheamountofliquidinsidetheballandotherrelevantparameters.4.SolitonAchainofsimilarpendulaismountedequidistantlyalongahorizontalaxis,withadjacentpendulabeingconnectedwithlightstrings.Eachpendulumcanrotateabouttheaxisbutcannotmovesideways(seefigure).Investigatethepropagationofadeflectionalongsuchachain.Whatisthespeedforasolitarywave,wheneachpendulumundergoesanentire360ºrevolution?5.LevitationAlightball(e.g.aPing-Pongball)canbesupportedonanupwardairstream.Theairstreamcanbetiltedyetstillsupporttheball.Investigatetheeffectandoptimisethesystemtoproducethemaximumangleoftiltthatresultsinastableballposition.6.ColouredplasticInbrightlight,atransparentplasticobject(e.g.ablankCDcase)cansometimesshineinvariouscolours(seefigure).Studyandexplainthephenomenon.Ascertainifonealsoseesthecolourswhenvariouslightsourcesareused.7.HearinglightCoatonehalfoftheinsideofajarwithalayerofsootanddrillaholeinitscover(seefigure).WhenlightfromalightbulbconnectedtoAChitsthejar’sblackwall,adistinctsoundcanbeheard.Explainandinvestigatethephenomenon.8.JetandfilmAthinliquidjetimpactsonasoapfilm(seefigure).Dependingonrelevantpa