2013-2014 SAT2 物理真题

TEST1YourresponsestothePhysicsSubjectTestquestionsshouldbefilledinonTest1ofyouranswersheet(atthebackofthebook).SATPHYSICSSUBJECTTEST1426|CrackingtheSATPhysicsSubjectTestQuestions1-4Foranobjecttravelinginastraightline,itsvelocity(v,inm/s)asafunctionoftime(t,ins)isgivenbythefollowinggraph.vtQuestions1-4relatetothefollowinggraphs.(A)t(D)tt(B)(E)tt(C)1.Whichgraphbestdepictstheobject’smomentum?2.Whichgraphbestillustratestheobject’sacceleration?3.Whichgraphbestdepictstheobject’skineticenergy?4.Whichgraphbestillustratestheobject’sdistancefromitsstartingpoint?Questions5-8(A)Displacement(B)Velocity(C)Acceleration(D)Linearmomentum(E)Kineticenergy5.WhichoneisNOTavector?6.Ifanobject’smassandthenetforceitfeelsarebothknown,thenNewton’ssecondlawcouldbeusedtodirectlycalculatewhichquantity?7.Whichquantitycanbeexpressedinthesameunitsasimpulse?8.Ifanobject’sspeedischanging,whichofthequantitiescouldremainconstant?PartADirections:Eachsetofletteredchoicesbelowreferstothenumberedquestionsimmediatelyfollowingit.Selecttheoneletterchoicethatbestanswerseachquestionorbestfitseachstatement,andthenfillinthecorrespondingovalontheanswersheet.Achoicemaybeusedonce,morethanonce,ornotatallineachset.PHYSICSSUBJECTTEST175Questions•Timelimit=1hour•YoumayNOTuseacalculator.GOONTOTHENEXTPAGEPHYSICSSUBJECTTEST1—ContinuedThePrincetonReviewPracticeSATPhysicsSubjectTest1|427GOONTOTHENEXTPAGEQuestions9-10(A)Newton’slawofuniversalgravitation(B)Redshiftoflightfromothergalaxies(C)Thefactthateveryelementofatomicnumbergreaterthan83isradioactive(D)Thezerothlawofthermodynamics(E)Mass–energyequivalence9.Whichprovidesthebasisfortheobservationthattheuniverseisexpanding?10.Whichprinciplecouldbeusedtohelpcalculatetheamountofradiationemittedbyastar?Questions11-12(A)Reflection(B)Refraction(C)Polarization(D)Diffraction(E)Interference11.Whichisduetothechangeinwavespeedwhenawavestrikestheboundarytoanothermedium?12.WhichphenomenonisNOTexperiencedbysoundwaves?PHYSICSSUBJECTTEST1—Continued428|CrackingtheSATPhysicsSubjectTestGOONTOTHENEXTPAGEPartBDirections:Eachofthequestionsorincompletestatementsbelowisfollowedbyfivesuggestedanswersorcompletions.Selecttheonethatisbestineachcaseandthenfillinthecorrespondingovalontheanswersheet.13.Anastronautstandingonthesurfaceofthemoon(mass=M,radius=R)holdsafeather(mass=m)inonehandandahammer(mass=100m)intheotherhand,bothatthesameheightabovethesurface.Ifhereleasesthemsimultaneously,whatistheaccelerationofthehammer?(A)mvr2(B)GMR2(C)GMmR2(D)100GMR2(E)100GMmR2Satellite#2Satellite#1E2rr14.Twosatellitesorbittheearth.Theirorbitsarecircular,andeachsatellitetravelsataconstantspeed.IfthemassofSatellite#2istwicethemassofSatellite#1,whichsatellite’sspeedisgreater?(A)Satellite#1,byafactorof2(B)Satellite#1,byafactorof2(C)Satellite#2,byafactorof2(D)Satellite#2,byafactorof2(E)Neither;thesatellites’speedsarethesame.Questions15-17refertothecollisionoftwoblocksonafrictionlesstable.Beforethecollision,theblockofmassmisatrest.4kgmjustbeforecollisionjustaftercollision4kgm8m/sv6m/s15.WhatisthetotalmomentumoftheblocksjustAFTERthecollision?(A)12kg-m/s(B)16kg-m/s(C)18kg-m/s(D)24kg-m/s(E)32kg-m/s16.Ifthecollisionwereelastic,whatisthetotalkineticenergyoftheblocksjustAFTERthecollision?(A)16J(B)32J(C)64J(D)128J(E)256J17.Iftheblockshadinsteadstucktogetherafterthecollision,withwhatspeedwouldtheymoveifm=12kg?(A)2.0m/s(B)2.7m/s(C)3.2m/s(D)4.0m/s(E)4.6m/sPHYSICSSUBJECTTEST1—ContinuedThePrincetonReviewPracticeSATPhysicsSubjectTest1|429GOONTOTHENEXTPAGE+Q+qfixedinposition18.Thefigureaboveshowstwopositivelychargedparticles.The+Qchargeisfixedinposition,andthe+qchargeisbroughtcloseto+Qandreleasedfromrest.Whichofthefollowinggraphsbestdepictstheacceleration(a)ofthe+qchargeasafunctionofitsdistance(r)from+Q?ar(A)ar(D)ar(B)ar(E)ar(C)19.Twoparticleshaveunequalcharges;oneis+qandtheotheris–2q.ThestrengthoftheelectrostaticforcebetweenthesetwostationaryparticlesisequaltoF.WhathappenstoFifthedistancebetweentheparticlesishalved?(A)Itdecreasesbyafactorof4.(B)Itdecreasesbyafactorof2.(C)Itremainsthesame.(D)Itincreasesbyafactorof2.(E)Itincreasesbyafactorof4.20.Asimpleharmonicoscillatorhasafrequencyof2.5Hzandanamplitudeof0.05m.Whatistheperiodoftheoscillations?(A)0.4sec(B)0.2sec(C)8sec(D)20sec(E)50sec21.Alightwave,travelingat3×108m/shasafrequencyof6×1015Hz.Whatisitswavelength?(A)5×10–8m(B)2×10–7m(C)5×10–7m(D)5×10–6m(E)2×107m22.Abeamofmonochromaticlightenteringaglasswindowpanefromtheairwillexperienceachangein(A)frequencyandwavelength(B)frequencyandspeed(C)speedandwavelength(D)speedonly(E)wavelengthonlyPHYSICSSUBJECTTEST1—Continued430|CrackingtheSATPhysicsSubjectTestGOONTOTHENEXTPAGEattimet=0Hm12θm12v0v0Questions23-25Twocannonsshootcannonballssimultaneously.Thecannonembeddedinthegroundshootsacannonballwhosemassishalfthatofthecannonballshotbytheelevatedcannon.Also,theinitialspeedofthecannonballprojectedfromgroundlevelishalftheinitialspeedofthecannonballshothorizontallyfromtheelevatedposition.Airresistanceisnegligibleandcanbeignored.Eachcannonballisinmotionformorethan2secondsbeforestrikingthelevelground.23.Leta1denotetheaccelerationofthecannonballofmassmonesecondafterlaunch,andleta2denotetheaccelerationofthecannonballofmassm/2onesecondafterlaunch.Whichofthefollowingstatementsistrue?(A)a1=4a2(B)a1=2a2(C)a1=a2(D)a2=2a1(E)a2=4a124.IfthecannonballprojectedfromgroundlevelisinflightforatotaltimeofT,whathorizontaldistancedoesittravel?(A)12v0T(B)v0T(C)12v0Tsinθ0(D)12v0Tcosθ0(E)v0Tcosθ025.Forthecannonballofmassm,whichofthefollowingquantitiesdecreasesasthecannonballfallstotheground?(A)Kineticenergy(B)Potentialenergy(C)Momentum(D)Speed(E)Mass26.Whichofthefollowingstatementsistrueconcerningphasechanges?(A)Whenaliquidfreezes,itreleasesthermalenergyintoitsimmediateenvironment.(B)Whenasolidmelts,itreleasesthermalenergyintoitsimmediateenvironment.(C)Formostsubstances,thelatentheatoffusionisgreaterthanthelatentheatofvaporization.(D)Asasolidmelts,itstemperatureincreases.(E)Asaliquidfreezes,itstemperaturedecreases.PHYSICSSUBJECTTEST1—ContinuedThePrincetonReviewPracticeSATPhysicsSubjectTest1|431GOONTOTHENEXTPAGE27.FourpointchargesarelabeledCharge1,Charge2,Charge3,andCharge4.ItisknownthatCharge1attractsCharge2,Charge2repelsCharge3,andCharge3attractsCharge4.Whichofthefollowingmustbetrue?(A)Charge1attractsCharge4.(B)Charge2attractsCharge3.(C)Charge1repelsCharge3.(D)Charge2repelsCharge4.(E)Charge1repelsCharge4.Questions28-30abcdefVAllsixresistorsinthecircuithavethesameresistance,R,andthebatteryisasourceofconstantvoltage,V.28.HowdoesthecurrentthroughResistoracomparewiththecurrentthroughResistorb?(A)ThecurrentthroughResistorais9timesthecurrentthroughResistorb.(B)ThecurrentthroughResistorais3timesthecurrentthroughResistorb.(C)ThecurrentthroughResistoraisthesameasthecurrentthroughResistorb.(D)ThecurrentthroughResistorbis3timesthecurrentthroughResistora.(E)ThecurrentthroughResistorbis9timesthecurrentthroughResistora.29.Ifthetotalresistanceinthecircuitis103R,theamountofcurrentthatpassesthroughresistoraiswhatconstanttimesVR?(A)120(B)110(C)310(D)109(E)10330.IfthepowerdissipatedbyresistoreisP,howmuchpowerisdissipatedbyresistorf?(A)P6(B)P3(C)P2(D)P(E)2P31.Anobjectofmass5kgisacteduponbyexactlyfourforces,eachofmagnitude10N.WhichofthefollowingcouldNOTbetheresultingaccelerationoftheobject?(A)0m/s2(B)2m/s2(C)4m/s2(D)8m/s2(E)10m/s2PHYSICSSUBJECTTEST1—Continued432|CrackingtheSATPhysicsSubjectTestGOONTOTHENEXTPAGE32.Thetotalforceactingonanobjectasafunctionoftimeisgiveninthegraphabove.Whatisthemagnitudeofthechangeinmomentumoftheobjectbetweent=0andt=0.4sec?(A)2kg-m/sec(B)5kg-m/sec(C)10kg-m/sec(D)12kg-m/sec(E)15kg-m/sec33.Anobjectisplaced20cmfromadiverginglens.Ifthedistancebetweenthelensandtheimageis8cm,whatisthemagnification?(A)115(B)25(C)12(D)2(E)5234.Aropestretchedbetweentwofixedpointscansupporttransversestandingwaves.Whatistheratioofthesixthharmonicfrequencytothethirdharmonicfrequency?(A)12(B)12(C)2(D)22(E)435.InwhichofthefollowingsituationsinvolvingasourceofsoundandadetectorofthesoundisitpossiblethatthereisNOperceivedDopplershift?(A)Thesourcetravelstowardthestationarydetector.(B)Thedetectortravelstowardthestationarysource.(C)Boththesourceandthedetectortravelinthesamedirection.(D)Boththesourceanddetectortravelinoppositedirections,withthesourceanddetectormovingawayfromeachother.(E)Boththesourceanddetectortravelinoppositedirections,withthesourceanddetectormovingtowardeachother.PHYSICSSUBJECTTEST1—ContinuedThePrincetonReviewPracticeSATPhysicsSubjectTest1|433GOONTOTHENEXTPAGE36.Soundwavestravelat350m/sthroughwarmairandat3,500m/sthroughbrass.Whathappenstothewavelengthofa700Hzacousticwaveasitentersbrassfromwarmair?(A)Itdecreasesbyafactorof20.(B)Itdecreasesbyafactorof10.(C)Itincreasesbyafactorof10.(D)Itincreasesbyafactorof20.(E)Thewavelengthremainsunchangedwhenawavepassesintoanewmedium.37.Whichofthefollowingtypesofelectromagneticradiationhasthelongestwavelength?(A)Gammarays(B)Ultraviolet(C)Bluelight(D)X-rays(E)Orangelight38.Thecircularmetalplatehasaconcentriccircularhole.Iftheplateisheateduniformly,sothattheoutercircumferenceoftheplateincreasesby4percent,thenthecircumferenceoftheholewill(A)decreaseby16percent(B)decreaseby8percent(C)decreaseby4percent(D)increaseby4percent(E)increaseby8percent39.Aboxofmass40kgispushedinastraightlineacrossahorizontalfloorbyan80Nforce.Iftheforceofkineticfrictionactingontheboxhasamagnitudeof60N,whatistheaccelerationofthebox?(A)0.25m/s2(B)0.5m/s2(C)1.0m/s2(D)2.0m/s2(E)3.5m/s2mass(inkg)speed(inm/s)Trial1:0.54Trial2:13Trial3:22Trial4:3140.Thetablerecordsthemassandspeedofanobjecttravelingatconstantvelocityonafrictionlesstrack,asperformedbyastudentconductingaphysicslabexercise.Inheranalysis,thestudenthadtostatethetrialinwhichtheobjecthadthegreatestmomentumandthetrialinwhichithadthegreatestkineticenergy.Whichofthefollowinggivesthecorrectanswer?GreatestGreatestMomentumKineticEnergy(A)Trial1Trial3(B)Trial2Trial2(C)Trial3Trial2(D)Trial3Trial3(E)Trial4Trial4PHYSICSSUBJECTTEST1—Continued434|CrackingtheSATPhysicsSubjectTestGOONTOTHENEXTPAGE41.WhatdidRutherford’sexperimentsonalphaparticlescatteringindicateaboutthestructureoftheatom?(A)Atomsareroughlysphericalwitharadiusofabout10–10m.(B)Theelectronsoccupyquantizedenergylevels,absorbingoremittingenergyonlywhentheymakeaquantumjumpbetweentheselevels.(C)Thedensityofpositivechargewithinanatomisnotuniformthroughouttheatom’svolume.(D)Allowedelectronorbitsmusthaveacircumferenceequaltoawholenumbertimestheelectron’sdeBrogliewavelength.(E)Alphaparticlesarepositivelycharged.42.Whathappenstothepressure,P,ofanidealgasifthetemperatureisincreasedbyafactorof2andthevolumeisincreasedbyafactorof8?(A)Pdecreasesbyafactorof16.(B)Pdecreasesbyafactorof4.(C)Pdecreasesbyafactorof2.(D)Pincreasesbyafactorof4.(E)Pincreasesbyafactorof16.43.Howmuchcurrentdoesa60-wattlightbulbdrawifitoperatesatavoltageof120volts?(A)0.25amp(B)0.5amp(C)2amps(D)4amps(E)30amps1212H+HHe+X→2344.IdentifytheparticleXresultingfromthenuclearreactionshownabove.(A)Positron(B)Electron(C)Proton(D)Neutron(E)Alphaparticle45.Ifa50gblockofsolidmarble(specificheat=0.9kJ/kg·°C),originallyat20°C,absorbs100Jofheat,whichoneofthefollowingbestapproximatesthetemperatureincreaseofthemarbleblock?(A)1°C(B)2°C(C)4°C(D)10°C(E)20°C46.Asampleofanidealgasisheated,doublingitsabsolutetemperature.Whichofthefollowingstatementsbestdescribestheresultofheatingthegas?(A)Theroot-mean-squarespeedofthegasmoleculesdoubles.(B)Theaveragekineticenergyofthegasmoleculesincreasesbyafactorof2.(C)Theaveragekineticenergyofthegasmoleculesincreasesbyafactorof4.(D)Thespeedsofthegasmoleculescoverawiderange,buttheroot-mean-squarespeedincreasesbyafactorof2.(E)Thespeedsofthegasmoleculescoverawiderange,buttheroot-mean-squarespeedincreasesbyafactorof2.PHYSICSSUBJECTTEST1—ContinuedThePrincetonReviewPracticeSATPhysicsSubjectTest1|435GOONTOTHENEXTPAGE47.Ablockofice,initiallyat–20°C,isheatedatasteadyrateuntilthetemperatureofthesamplereaches120°C.Whichofthefollowinggraphsbestillustratesthetemperatureofthesampleasafunctionoftime?120100020–Temp(ºC)(A)Time12020�Temp(ÀC)(B)Time12010020–Temp(ºC)(C)Time1200–20TimeTemp(ºC)(D)(E)1201000–20Temp(ºC)Time48.Whichofthefollowingchangestoadouble-slitinterferenceexperimentwithlightwouldincreasethewidthsofthefringesinthediffractionpatternthatappearsonthescreen?(A)Uselightofashorterwavelength(B)Movethescreenclosertotheslits(C)Movetheslitsclosertogether(D)Uselightwithalowerwavespeed(E)Increasetheintensityofthelight49.Inanexperimentdesignedtostudythephotoelectriceffect,itisobservedthatlow-intensityvisiblelightofwavelength550nmproducednophotoelectrons.Whichofthefollowingbestdescribeswhatwouldoccuriftheintensityofthislightwereincreaseddramatically?(A)Almostimmediately,photoelectronswouldbeproducedwithakineticenergyequaltotheenergyoftheincidentphotons.(B)Almostimmediately,photoelectronswouldbeproducedwithakineticenergyequaltotheenergyoftheincidentphotonsminustheworkfunctionofthemetal.(C)Afterseveralseconds,necessaryfortheelectronstoabsorbsufficientenergyfromtheincidentenergy,photoelectronswouldbeproducedwithakineticenergyequaltotheenergyoftheincidentphotons.(D)Afterseveralseconds,necessaryfortheelectronstoabsorbsufficientenergyfromtheincidentenergy,photoelectronswouldbeproducedwithakineticenergyequaltotheenergyoftheincidentphotonsminustheworkfunctionofthemetal.(E)Nothingwouldhappen.PHYSICSSUBJECTTEST1—Continued436|CrackingtheSATPhysicsSubjectTestGOONTOTHENEXTPAGE–21eV–38eV–85eV–340eVEgroundstate50.Thediagram(notdrawntoscale)givesthefirstfewelectronenergylevelswithinasingle-electronatom.WhichofthefollowinggivestheenergyofaphotonthatcouldNOTbeemittedbythisatomduringanelectrontransition?(A)17eV(B)42eV(C)64eV(D)255eV(E)302eVaaaaaaaaa•••232I4•1I51.Thefigureaboveshowsapairoflong,straightcurrent-carryingwiresandfourmarkedpoints.Atwhichofthesepointsisthenetmagneticfieldzero?(A)Point1only(B)Points1and2only(C)Point2only(D)Points3and4only(E)Point3only52.Anonconductingsphereisgivenanonzeronetelectriccharge,+Q,andthenbroughtclosetoaneutralconductingsphereofthesameradius.Whichofthefollowingwillbetrue?(A)Anelectricfieldwillbeinducedwithintheconductingsphere.(B)Theconductingspherewilldevelopanetelectricchargeof–Q.(C)Thesphereswillexperienceanelectrostaticattraction.(D)Thesphereswillexperienceanelectrostaticrepulsion.(E)Thesphereswillexperiencenoelectrostaticinteraction.53.Whichofthefollowingwouldincreasethecapacitanceofaparallel-platecapacitor?(A)Usingsmallerplates(B)Replacingthedielectricmaterialbetweentheplateswithonethathasasmallerdielectricconstant(C)Decreasingthevoltagebetweentheplates(D)Increasingthevoltagebetweentheplates(E)MovingtheplatesclosertogetherABCD54.Thefourwiresareeachmadeofaluminum.Whichwirewillhavethegreatestresistance?(A)WireA(B)WireB(C)WireC(D)WireD(E)Allthewireshavethesameresistancebecausethey’reallcomposedofthesamematerial.PHYSICSSUBJECTTEST1—ContinuedThePrincetonReviewPracticeSATPhysicsSubjectTest1|437GOONTOTHENEXTPAGEQuestions55-57ODisplacement0.16m0.60mDistance55.Whatistheamplitudeofthewave?(A)0.08m(B)0.16m(C)0.32m(D)0.48m(E)0.60m56.Whatisthewavelengthofthewave?(A)0.08m(B)0.16m(C)0.20m(D)0.40m(E)0.60m57.Thedrawingshowsthedisplacementofatravelingwaveattimet=0.Ifthewavespeedis0.5m/sec,andthewavelengthisλm,whatistheperiodofthewave(inseconds)?(A)14λ(B)12λ(C)1λ(D)2λ(E)4λ58.Lead-199hasahalf-lifeof1.5hours.Ifaresearcherbeginswith2gramsoflead-199,howmuchwillremainafter6hours?(A)0.125grams(B)0.25grams(C)0.375grams(D)0.5grams(E)0.625gramsPHYSICSSUBJECTTEST1—Continued438|CrackingtheSATPhysicsSubjectTestGOONTOTHENEXTPAGE59.Thesquareshownisthesamesizeineachofthefollowingdiagrams.Inwhichdiagramistheelectricalpotentialenergyofthepairofchargesthegreatest?60.Fourpointcharges,twopositiveandtwonegative,arefixedinpositionatthecornersofasquare,asshownbelow.Whichoneofthefollowingarrowsbestillustratesthetotalelectrostaticforceonthechargeinthelowerright-handcornerofthesquare?(A)(B)(C)(D)(E)Theelectricforceonthischargeis0.PHYSICSSUBJECTTEST1—ContinuedThePrincetonReviewPracticeSATPhysicsSubjectTest1|439GOONTOTHENEXTPAGEtablefloor50cmmO61.Oneendofarigid,masslessrodoflength50cmisattachedtotheedgeofthetableatpointO;attheotherendoftherodisaballofclayofmassm=0.2kg.Therodextendshorizontallyfromtheendofthetable.WhatisthetorqueofthegravitationalforceontheclayballrelativetopointO?(A)0.01N-m(B)0.1N-m(C)1N-m(D)10N-m(E)100N-m62.Tworocksaredroppedsimultaneouslyfromthetopofatallbuilding.Rock1hasmassM1,androck2hasmassM2.Ifairresistanceisnegligible,whatistheratioofrock1’smomentumtorock2’smomentumjustbeforetheyhittheground?(A)MM12(B)MM12(C)(MM12)2(D)1(E)Noneoftheabove63.ThefourforcesactontheblockasitmovesthedistanceL.Whatisthetotalworkperformedontheblockbytheseforces?(A)(F+f)L(B)(F−f)L(C)(N−w)L(D)(N+w)L(E)(F−N+f−w)LPHYSICSSUBJECTTEST1—Continued440|CrackingtheSATPhysicsSubjectTestGOONTOTHENEXTPAGElightbulbvariableresistorinsulatinghandle64.Aloopofmetalwirecontainingatinylightbulbisattachedtoaninsulatinghandleandplacedoveracoilofwireinwhichacurrentcanbeestablishedbyasourceofemfandcontrolledbyavariableresistor.Theplaneofthetoploopisparalleltotheplaneofthebottomcoil.WhichofthefollowingcouldNOTcausethebulbtolight?(A)Rotatingthehandle90°whilekeepingtheplaneofthetoploopparalleltotheplaneofthebottomcoil(B)Raisingthehandleupandawayfromthecoil(C)Loweringthehandledowntowardthecoil(D)Decreasingtheresistanceofthecoil(E)Increasingtheresistanceofthecoil65.Duringeachcycle,aheatenginewithanefficiencyof25%takesin800Jofenergy.Howmuchwasteheatisexpelledduringeachcycle?(A)100J(B)200J(C)300J(D)400J(E)600JRR+Q+Q–Q66.Threepointchargesarearrangedalongastraightline.IfkdenotesCoulomb’sconstant,whatisthestrengthoftheelectrostaticforcefeltbythepositivechargeattheleftendoftheline?(A)kQR222(B)kQR22(C)3422kQR(D)5422kQR(E)3222kQR67.Considertwoadjacenttransparentmedia.ThespeedoflightinMedium1isv1,andthespeedoflightinMedium2isv2.Ifv1<v2,thentotalinternalreflectionwilloccurattheinterfacebetweenthesemediaifabeamoflightis(A)incidentinMedium1andstrikestheinterfaceatanangleofincidencegreaterthansin–1(v1/v2).(B)incidentinMedium1andstrikestheinterfaceatanangleofincidencegreaterthansin–1(v2/v1).(C)incidentinMedium2andstrikestheinterfaceatanangleofincidencegreaterthansin–1(v1/v2).(D)incidentinMedium2andstrikestheinterfaceatanangleofincidencegreaterthansin–1(v2/v1).(E)Totalinternalreflectionisimpossibleinthesituationdescribed.PHYSICSSUBJECTTEST1—ContinuedThePrincetonReviewPracticeSATPhysicsSubjectTest1|441GOONTOTHENEXTPAGEQuestions68-69kXOYmAblockisattachedtotheendofalinearspring,theotherendofwhichisanchoredtoawall.TheblockisoscillatingbetweenextremepositionsXandYonafrictionlesstable,andwhentheblockisatPointO,thespringisatitsnaturallength.Thevalueofthespring’sforceconstant,k,isknown,butthemassoftheblock,m,isunknown.68.Knowingwhichoneofthefollowingwouldpermityoutocalculatethevalueofm?(A)TheaccelerationoftheblockatPointO(B)TheaccelerationoftheblockatPointY(C)ThespeedoftheblockasitpassesthroughO(D)ThedistancebetweenXandY(E)ThetimerequiredfortheblocktotravelfromXtoY69.Ifω=km,andthedistancebetweenOandYisd,whatisthespeedoftheblockatpointO?(A)dω2(B)dω(C)2dω(D)d2ω(E)dω270.Aparticletravelsinacircularpathofradius0.2mwithaconstantkineticenergyof4J.Whatisthenetforceonthisparticle?(A)4N(B)16N(C)20N(D)40N(E)CannotbedeterminedfromtheinformationgivenQuestions71-724cm3cmYZ3cmX+Q71.Howmuchworkisdonebytheelectricfieldcreatedbythestationarycharge+Q=+2.0Ctomoveachargeof+1.0×10–9CfrompositionXtopositionZ?(Note:ThevalueofCoulomb’sconstant,k,is9×109N-m2/C2.)(A)0J(B)150J(C)300J(D)560J(E)1,000JPHYSICSSUBJECTTEST1—Continued442|CrackingtheSATPhysicsSubjec