SAT2物理考試介紹及模擬題

SAT2物理考試內(nèi)容與考點(diǎn)介紹Mathandphysicsgohandinhand,right?Youmightbesurprised,then,tolearnthatyouaren'tallowedtouseacalculatoronSATIIPhysics.Themathrequiredofyounevergoesbeyondsimplearithmeticandmanipulationofequations.Youhave,onaverage,48secondstoanswereachquestion,andthepeopleatETSrealizethatisn,tenoughtimetodelveintoproblemsinvolvingsimultaneousequationsorcomplextrigonometry.They,remoreinterestedintestingyourgraspofthebasicconceptsofphysics.Ifyou,vegraspedtheseconcepts,yourweaknessinmathisn,tgoingtohurtyou.PercentageoftheTest34-38%PercentageoftheTest34-38%22-26%15-19%8-12%8-12%2-4%TopicMechanicsElectricityandMagnetismWavesHeat,KineticTheory,andThermodynamicsModernPhysicsMiscellaneousWhilethesecategoriesarehelpful,theyarealsoverybroad.Youmaybeawhizwithwavesbutaloserwithlenses,andwanttoknowhowmuchofthewavesportionofthetestwillbedevotedtooptics.Tohelpyouout,we,vebrokenthetestdownevenfurthersothatyou,llknowexactlywheretoexpecttofeelthesqueeze.(Thesefiguresareonlyapproximations,andmayvaryfromtesttotest.)Topic%oftheTestNumberofQuestionsMechanics34-38%25-29Vectors2%1-2Kinematics6%4-5Dynamics10%7-8Work,Energy,andPower6%4-5SpecialProblemsinMechanics5%3-4LinearMomentum2%1-2RotationalMotion1%0-1CircularMotionandGravitation4%2-4

ThermalPhysics8-12%6-10HeatandTemperature4%2-4KineticTheoryandIdealGasLaws2-3%1-2LawsofThermodynamics1%0-2HeatEngines2-3%1-2Electricity&Magnetism22-26%16-20ElectricFields,Forces,Potential10%7-8MagneticFieldsandForces6%4-5ElectromagneticInduction1%1CircuitsandCircuitElements6%4-5Waves15-19%11-15Waves10%7-8Optics7%5-6ModernPhysics8-12%6-9SpecialRelativity1-2%1-2AtomicModels3%2-3QuantumPhysics2%1-2NuclearPhysics3%2-3Miscellaneous2-4%1-3GraphAnalysis1-2%0-2EquationManipulation0.5-1%0-1SignificantDigitsandLabSkills0.5-1%0-1Thechaptersofthisbookareorganizedaccordingtothesecategories.Ifaphysicstopicisnotinthisbook,youdon'tneedtoknowit.Here'ssomeotherhelpfulinformation:Youneedtoknow:theformulasexpressingphysicalrelationships(suchasF=ma),howtomanipulateequations,howtoreadagraphYoudon'tneedtoknow:trigidentities,calculus,three-dimensionalvectorsandgraphs,工physicalconstants(suchasG=6.67 10-11N-m2/kg2)SAT物理練習(xí)題1SAT物理練習(xí)題一SATPhysicsPracticeTestOneQuestion1:Anobjectofmassmmovingwithavelocityvcollideswithanotherobjectofmass2m.Thetwoobjectssticktogetherandtheycollidewithathirdobjectofmass3m.Afterthesecondcollisionthethreeobjectsmovetogetheratthesamespeed.Whatisthevelocityofthethreeobjectsafterthesecondcollision?v/12v/6v/3v/2vQuestion2:Anelectricmotoracceleratesitsrotationwithaconstantangularaccelerationof2rad/§untilitreachesafrequencyoff=10冊(cè)Hz.Ifthemotorstartsfromrest,howlongdoesittaketoreachfrequencyf?6s10s第12s15sQuestion3:Twosatellitesorbittheearthatradiir1andr『Whatistheratioofthevelocitiesofthetwosatellites?

V2八Question4:250Jofheatareaddedtoagasinacylindricalcontainerandthenthegasdoes120Jofworkonthetopandbottomwallsofthecylinder.Whatisthechangeininternalenergyforthegas?0J120J130J250J-120JQuestion5:Threepointchargesofcharge+Qareplacedasshownabove.Atwhatpointwillanegativechargeexperienceaforcetowardthebottomofthepage?ABCDEQuestion6:ResistorR1=5QandresistorR2=10QareconnectedinseriestoavoltagesourceE=60V.WhatistheratiobetweenthepowerdissipationinR2andthepowerdissipationinR1?12345Question7:ResistorR1=4QandresistorR2=6Qareconnectedinseries.IfthetoleranceofR1is1%andthetoleranceofR2is2%,whatisthetoleranceoftheequivalentresistorR?.8%1%1.6%2%3%Question1solution:Accordingtothelawofconservationofmomentum,mv=(m+2m)v1and,(m+2m)v1=(m+2m+3m)v2,wherev1andv2arethespeedafterthefirstandafterthesecondcollision.Inconclusion,mv=6mv2andv2=v/6.Question2solution:t=3/s=2nf/swhere3istheangularspeedandsistheangularacceleration.t=2n(10/n)/2t=10s.Question3solution:Weequatetheformulasforgravitationalforceandcentripetalforce:mv2/r=GmM/r2r=radiusoftheorbit;m=massofsatellite;M=massofplanet;v=speedofsatellite;v12=GM/r1v/=GM/r2Question4solution:AccordingtotheFirstLawofThermodynamics,thechangeininternalenergyisequaltothechangeinheatplustheworkdoneonthesystem.AU=AQ+AW=250J-120J=130J.Question5solution:AAandDaretheonlypointsthathavethehorizontalcomponentoftheforceequaltozero.AnegativechargeexperiencesaforcetowardthebottomofthepageinpointAandtowardsthetopofthepageinpointB.(a)isthecorrectanswer.? Question6solution:P2=R2I2P1=R1I2Wedividethe2equationsand,P2/P1=R2/R1P2/P1=100/50P2/P產(chǎn)2? Question7solution:R1(1+t1)+R2(1+t2)=R(1+t),WealsoknowthatR1+R2=R.Wesubstractthesecondequationfromthefirstequation:R1t1+R2t2=Rt,t=(R1t1+R2t2)/Rt=(4-1%+6.2%)/10t=1.6%isthetoleranceoftheseriesresistorcombination.SAT物理練習(xí)題2SAT物理練習(xí)題二SATPhysicsPracticeTestTwo

Question1:Question1:Fiveparticleschargedwiththesamecharge+qmovewiththesamespeedvinamagneticfieldB,asshownabove.Whichparticleexperiencesthehighestmagneticforce?ABCDEQuestion2:Twowiresofcircularcross-sectionalareashaveresistancesR1andR2.Ifp1Ifp1=2P2,l]=2l2andr1=2r2,whatistheratioR1/R2p1,p2aretheresistivitiesofthetwowires,lpl2arethelengthsofthetwowires,q,r2aretheradiiofthetwowires.11/21/42

Question3:TwowirescarryidenticalcurrentsI,asshownabove.Atwhichpointisthemagneticfieldthestrongest?ABCDEQuestion4:Twometallicbarsslidealongmetallicrailsatspeedsv1=.1m/sandv2=.2m/sasshownabove.Thebarandtherailsaresituatedinamagneticfieldof4T.Whatistheinducedvoltageinthebarandrails?20mV30mV40mV120mV150mVQuestion5:Apolicecarwithitssirenontravelsataspeedv1towardaperson.Thefrequencyofthesirenis§andthepersonhearsthesoundatafrequencyf2.Ifvsisthespeedofsound,v1=Vsf2/f1vj-f2/f1)vs(f1/f2-Dvj-f1/f2)vs(f2/f1-1)Question6:Violetlighthasawavelengthof400nm.Whatisitsfrequency,ifthespeedoflightis3108?5-10147.5-101410152-10155-1015Question7:Theactivityofaradioactivesampleattimet=0sisAandtheactivityofthesameradioactivesampleattimet1isA1.Whatisthedecayconstantofthesample?[ln(A1/A0)]/t1[ln(A0/A1)]/t1[ln(A1-A2)]/t1[ln(A1/A0)]t1elA/Ayt

SAT2物理練習(xí)題參考答案與解析參見(jiàn)下一頁(yè)Question1:Fiveparticleschargedwiththesamecharge+qmovewiththesamespeedvinamagneticfieldB,asshownabove.Whichparticleexperiencesthehighestmagneticforce?Solution:ThemagneticforceexperiencedbyamovingparticleisgivenbytheformulaF=q(vxB).WecanmaximizeFbyensuringthatthespeedandthemagneticfieldareperpendiculartooneanother.ParticuleAisthecorrectanswer.

Question3:TwowirescarryidenticalcurrentsI,asshownabove.Atwhichpointisthemagneticfieldthestrongest?Solution:PointsDandBaresituatedatequaldistancefromthetwowiresandthemagneticfieldis0atthesepoints.AsthemagneticfieldscreatedbythetwocurrentshaveoppositedirectionsatpointsA,CandE,thestrongestmagneticfieldwillbeatpointA,becausethecomponentgeneratedbythe"horizontal"currentismuchlowerthantheonecreatedbythe"vertical"one.Question4:Twometallicbarsslidealongmetallicrailsatspeedsv1=.1m/sandv2=.2m/sasshownabove.Thebarandtherailsaresituatedinamagneticfieldof4T.Whatistheinducedvoltageinthebarandrails?Solution:e=-d①/dt-B-dA/dtdA/dt=l(dx/dt)=l(vi+v2)TheinducedvoltageinthebarisB-l-(vi+v2)=120mV.hearsthesoundatafrequencyf2.Ifvsisthespeedofsound,v1Solution:Thefrequencyheardbythepersonisgivenbytheformula:f2=[vs/(vs-%明f2vs-f2V1=f1vsv1=vs(f1/f2-1)Question6:Violetlighthasawavelengthof400nm.Whatisitsfrequency,ifthespeedoflightis3-108?Solution:f=c/X=3-108/400-10-9=7.514Hz.Question7:Theactivityofaradioactivesampleattimet=0sisA。andtheactivityofthesameradioactivesampleattimet1isArWhatisthedecayconstantofthesample?Solution:A1=A0%A1/A0=eXt1入=[ln(A1/A0)]/t1?SAT物理練習(xí)題3SAT物理練習(xí)題三SATPhysicsPracticeTestThreeQuestion1:

Whatisthemagnitudeofthevector3A-Binthefigureabove?A.3B.4C.5D.2E.6Question2:Thegraphaboveshowstheaccelerationofaparticle.Att=0s,thespeedoftheparticleis1m/s.Whatisthespeedoftheparticleatt=4s?11m/s9m/s19m/s13m/s10m/sQuestion3:ForcesF1andF2inthefigureaboveactonablockofmassm=10kgthatmovesonafrictionlesssurface.Whatistheaccelerationoftheblock?1m/s1.5m/sm/s2.5m/sm/sQuestion4:Ablockofmassmismovingdownaninclinedplanewithadecreasingspeed.ThecoefficientoffrictionbetweentheblockandtheplaneismWhichofthefollowingstatementsistrue?sin(a)<gsin(a)>gcos(a)<gcos(a)>gtan(a)<gQuestion5:Whenacar'skineticenergyincreases9times,whathappenswithitsspeed?increases9timesincreases3timesdecreases9timesdecreases3timesremainsconstantQuestion6:Anobjectofmass4kgisattachedtoaspring.Theequilibriumpositionoftheobjectis.4mfromthepointwherethespringexertsnoforceontheobject.Whatisthespringconstant,k?10N/m80N/m100N/m150N/m200N/mQuestion7:Anobjectofmass10kgsittingonafrictionlesshorizontalplaneismovedfromastationarystatebytheforceshownabove.Whatisthevelocityoftheobjectattimet=5s?2.5m/s3m/s4m/s

5m/s6m/sSAT2物理練習(xí)題參考答案與解析參見(jiàn)下一頁(yè)Question1:Whatisthemagnitudeofthevector3A-Binthefigureabove?Solution:Themagnitudeofthevector3Ais3andthemagnitudeofvectorBis4.Theanglebetweenvectors3AandBis90QAccordingtothePythagoreantheorem,themagnitudeof3A-Bis5.Question2:

Thegraphaboveshowstheaccelerationofaparticle.Att=0s,thespeedoftheparticleis1m/s.Whatisthespeedoftheparticleatt=4s?Solution:Att=2s,thespeedoftheparticleisv2s=v0s+2m/s2-2s=5m/s.Att=4s,thespeedoftheparticleisv4s=v2s+3m/s2-2s=11m/s.Question3:ForcesF1andF2inthefigureaboveactonablockofmassm=10kgthatmovesonafrictionlesssurface.Whatistheaccelerationoftheblock?Solution:F1cos(60o)+F2cos(60o)=m-a20.1/2+30-1/2=10-a25=10.aa=2.5m/s2Question4:Ablockofmassmismovingdownaninclinedplanewithadecreasingspeed.Thecoefficientoffrictionbetweentheblockandtheplaneisg.Whichofthefollowingstatementsistrue?Solution:mgsin(a)-?mgcos(a)=aThespeedisdecreasingsoa<0,Thismeansthatmgsin(a)-?mgcos(a)<0mgsin(a)<?mgcos(a)tan(a)<?o Question5:Whenacar'skineticenergyincrea