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1、SINGAPOREJUNIORPHYSICSOLYMPIAD2011GENERALROUND3August,20112:30pm–4:00pmTimeAllowed:ONEhourTHIRTYminutesINSTRUCTIONS1.Thispapercontains50multiplechoicequestionsand21printedpages.2.Eachofthequestionsorincompletestatementsisfollowedbyfivesuggestedan-swersorcompletions.
2、Selecttheonethatisbestineachcaseandthenshadethecorrespondingbubbleontheanswersheet.3.Onlytheanswersheetwillbecollectedattheendofthetest.Answerswrittenanywhereelsewillnotbemarked.4.Use2Bpencilonly.Usinganyothertypeofpencilorpenmayresultinanswersunrecognizablebythema
3、chine.5.Answerallquestions.MarkswillNOTbedeductedforwronganswers.6.Scientificcalculatorsareallowedinthistest.7.Atableofinformationisgiveninpage2.TABLEOFINFORMATION2AccelerationduetogravityatEarthsurface,g=9.80m/sUniversalgasconstant,R=8.31J/(mol·K)−1222Vacuumpermitt
4、ivity,0=8.85×10C/(N·m)−7Vacuumpermeability,μ0=4π×10T·m/A−27Atomicmassunit,u=1.66×10kg8Speedoflightinvacuum,c=3.00×10m/s−19Chargeofelectron,e=1.60×10C−34Planck’sconstant,h=6.63×10J·s−31Massofelectron,me=9.11×10kg−27Massofproton,mp=1.67×10kg−23Boltzmannconstant,k=1.
5、38×10J/K23−1Avogadro’snumber,NA=6.02×10mol5Standardatmospherepressure,P0=1.01×10Pa3Densityofwater,ρw=1000kg/mx−utLorentzTransformation:x=1−u2/c2y=yz=zt−ux/c2t=1−u2/c221.Acaracceleratesfrom4.0m/sto24m/satarateof3.0m/s2.Howfardoesittravelwhileaccelerating?(A)56
6、m(B)93m(C)158m(D)195m(E)279m2.Amarathonrunnerrunsatasteadyspeedof15km/hr.Whentherunneris7.5kmfromthefinish,abirdbeginsflyingfromtherunnertothefinishat30km/hr.Whenthebirdreachesthefinishline,itturnsaroundandfliesbacktotherunner,andthenturnsaroundagain,repeatingtheback-an
7、d-forthtripsuntiltherunnerreachesthefinishline.Howmanykilometersdoesthebirdtravel?(A)10km(B)15km(C)20km(D)30km(E)45km3.A2kgmassanda4kgmassonahorizontalfrictionlesssurfaceareconnectedbyamasslessstringA.TheyarepulledhorizontallyacrossthesurfacebyasecondstringBwithacon
8、stantaccelerationof12m/s2.Whatisthemagnitudeofthenetforceonthe2kgmass?(A)72N(B)48N(C)24N(D)6N(E)3N34.Supermanstandsontheroofgardenofaverytallbuil
