MOOC College Physics I-Dalian University of Technology 中國大學(xué)慕課答案

MOOCCollegePhysicsI-DalianUniversityofTechnology中國大學(xué)慕課答案Pre-coursepreparation1、問題：Velocityinphysicsisthespeedofanobject.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】2、問題：Accelerationisdefinedasavectorquantitythatindicatestherateofchangeofvelocity.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】3、問題：Distanceanddisplacementaretwoquantitiesthatmayseemtomeanthesamethingyethavedifferentdefinitionsandmeanings.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】UnitTest11、問題：Whichofthefollowingisavectorquantity:選項(xiàng)：A、speedB、timeC、accelerationD、mass正確答案:【acceleration】2、問題：Inrighthandedcoordinatesystemwhichaxisisconsideredtobepositive?選項(xiàng)：A、Thethumbisz-axis,fingerscurledfromy-axistox-axisB、Thethumbisx-axis,fingerscurledfromz-axistoy-axisC、Thethumbisy-axis,fingerscurledfromx-axistoz-axisD、Thethumbisz-axis,fingerscurledfromx-axistoy-axis正確答案:【Thethumbisz-axis,fingerscurledfromx-axistoy-axis】3、問題：WhatisthemagnitudeoftheCartesianvectorhavingthex,yandzaxiscomponentstobeA,BandC?選項(xiàng)：A、SquarerootofthesquareseachA,BandCB、SquareofthesquareseachA,BandCC、CuberootofthesquareseachA,BandCD、CubeofthesquareseachA,BandC正確答案:【SquarerootofthesquareseachA,BandC】4、問題：Theradialcomponentofvelocityforaparticlemovinginacircularpathis______.選項(xiàng)：A、Anon-zeroconstantB、RadiusitselfC、VariableD、Zero正確答案:【Zero】5、問題：Whenaccelerationis_______,avelocityofaparticleisconstant.選項(xiàng)：A、ConstantbutnonzeroB、MaximumC、ZeroD、Noneofthechoicesarecorrect正確答案:【Zero】6、問題：Ablockslidingdownaninclinedplanehasacceleration_________accelerationduetogravity.選項(xiàng)：A、LessthanB、GreaterthanC、SameasD、Noneofthechoicesarecorrect正確答案:【Lessthan】7、問題：Aphysicsprofessorleavesherhouseandwalksalongthesidewalktowardcampus.After5minitstartstorainandshereturnshome.HerdistancefromherhouseasafunctionoftimeisshowninFig.AtPoint_________(fillinthelabeledpointsI/II/III/IV/V)ishervelocityzero.選項(xiàng)：A、IVB、IC、VD、II正確答案:【IV】8、問題：Aphysicsprofessorleavesherhouseandwalksalongthesidewalktowardcampus.After5minitstartstorainandshereturnshome.HerdistancefromherhouseasafunctionoftimeisshowninFig.AtPoint_________(fillinthelabeledpointsI/II/III/IV/V)ishervelocityincreasinginmagnitude.選項(xiàng)：A、IVB、IC、VD、II正確答案:【II】9、問題：Amodelofahelicopterrotorhasfourblades,each3.40mlongfromthecentralshafttothebladetip.Themodelisrotatedinawindtunnelat550rev/min.Thelinearspeedofthebladetipis________m/s.選項(xiàng)：A、19.6m/sB、196m/sC、208m/sD、20.8m/s正確答案:【196m/s】10、問題：AnastronauthaslefttheInternationalSpaceStationtotestanewspacescooter.Herpartnermeasuresthefollowingvelocitychanges,takingplaceina10sinterval.Atthebeginningsheismovingtowardtherightat15.0m/s,andattheendsheismovingtowardtheleftat15.0m/s.Themagnitudeofheraverageaccelerationis________m/s^2.選項(xiàng)：A、3B、8C、12D、7正確答案:【3】11、問題：Abodythat’smovingwithaconstantspeedtravelsoncearoundacircularpath.Whichofthefollowingis/aretrueconcerningthemotion?I.Thedisplacementiszero.II.Theaveragespeediszero.III.Theaccelerationiszero.選項(xiàng)：A、IonlyB、IandIIC、IandIIID、IIandIIIE、IIonlyF、IIIonly正確答案:【Ionly】12、問題：Arockisthrownoffa35mcliffata45°angleabovethehorizontal.Whichisthefollowingistrueregardingtheaccelerationoftherock?選項(xiàng)：A、Theaccelerationwillbeofmagnitudegandhavebothhorizontalandverticalcomponents.B、Atthepeakoftherock’spath,themagnitudeofaccelerationwillbehalfofwhatitwaswhentherockwasinitiallythrown.C、Theaccelerationwillbeofmagnitudegandinadownwarddirection.D、Theaccelerationwillbedownwardduringtherock’sascentandupwardduringtherock’sdescent.E、Theaccelerationwillincreasethroughouttherock’sflight.正確答案:【Theaccelerationwillbeofmagnitudegandinadownwarddirection.】13、問題：Asmallstoneisthrownhorizontallywithaninitialspeedof30m/sfromabridge.Findthestone’stotalspeedwhenitentersthewater4secondslater.(Ignoreairresistance.)選項(xiàng)：A、30m/sB、40m/sC、50m/sD、60m/sE、70m/sF、80m/s正確答案:【50m/s】14、問題：Whichoneofthefollowingstatementsistrueconcerningthemotionofanidealprojectilelaunchedatanangleof45°tothehorizontal?選項(xiàng)：A、Theaccelerationvectorpointsoppositetothevelocityvectoronthewayupandinthesamedirectionasthevelocityvectoronthewaydown.B、Thespeedatthetopofthetrajectoryiszero.C、Theobject'stotalspeedremainsconstantduringtheentireflight.D、Thehorizontalspeeddecreasesonthewayupandincreasesonthewaydown.E、Theverticalspeeddecreasesonthewayupandincreasesonthewaydown.正確答案:【Theverticalspeeddecreasesonthewayupandincreasesonthewaydown.】15、問題：Thepositionofanobjectmovinginastraightlineisgivenbytheequationx=(3t3+7t+5)m,wheretisinseconds.Whatistheobject’saccelerationattimet=5seconds?選項(xiàng)：A、415m/s2B、232m/s2C、115m/s2D、90m/s2E、35m/s2正確答案:【90m/s2】16、問題：Theearthhasaradiusof6380kmandturnsaroundonceonitsaxisin24h.Whatistheradialaccelerationofanobjectattheearth’sequator?_______m/s2選項(xiàng)：A、0.034B、0.0014C、1.2D、0.87E、0.095正確答案:【0.034】17、問題：Theearthhasaradiusof6380kmandturnsaroundonceonitsaxisin24h.Ifaradattheequatorisgreaterthang,objectswillflyofftheearth’ssurfaceandintospace.Whatwouldtheperiodoftheearth’srotationhavetobeforthistooccur?選項(xiàng)：A、5070SB、8060SC、3.4hD、6080SE、4.6hF、1.4h正確答案:【5070S#1.4h】18、問題：Aballisprojectedwithaninitialvelocityofmagnitudev0=40m/stowardaverticalwallasshowninthefigure.Howlongdoestheballtaketoreachthewall?______S選項(xiàng)：A、0.3B、0.4C、1.0D、2.0E、3.0F、4.0正確答案:【1.0】19、問題：Twoprojectilesarelaunchedat100m/s,theangleofelevationforthefirstbeing30°andforthesecond60°.Whichofthefollowingstatementsisfalse?選項(xiàng)：A、Bothprojectileshavethesameaccelerationwhileinflight.B、Thesecondprojectilehasthelowerspeedatmaximumaltitude.C、Bothprojectileshavethesamerange.D、Alloftheotherstatementsarefalse.正確答案:【Alloftheotherstatementsarefalse.】20、問題：PlaneAisflyingat400mphinthenortheastdirectionrelativetotheearth.PlaneBisflyingat500mphinthenorthdirectionrelativetotheearth.WhatisthespeedofPlaneBasobservedfromPlaneA?選項(xiàng)：A、900mphB、640mphC、357mphD、100mph正確答案:【357mph】Pre-coursepreparation1、問題：Equilibriumistheconditionofasystemwhenneitheritsstateofmotionnoritsinternalenergystatetendstochangewithtime.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】2、問題：Todescribeaforce,weonlyneedtodescribethemagnitudethatdescribehowhardtheforcepushesorpulls.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】3、問題：Inclassicalmechanicskinematicsgenerallyreferstothestudyofpropertiesofmotion--position,velocity,acceleration.Dynamicsisthestudyofthephysicsofmotionandhowitrelatestoappliedforces.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】UnitTest21、問題：Ifanobjectisinequilibrium,whichofthefollowingstatementsisnottrue?選項(xiàng)：A、Thespeedoftheobjectremainsconstant.B、Theaccelerationoftheobjectiszero.C、Thenetforceactingontheobjectiszero.D、Theobjectmustbeatrest.正確答案:【Theobjectmustbeatrest.】2、問題：Twoblocks,joinedbyastring,havemassesof6.0kgand9.0kg.Theyrestonafrictionlesshorizontalsurface.Asecondstring,attachedonlytothe9kgblock,hashorizontalforce=30Nappliedtoit.Bothblocksaccelerate.Findthetensioninthestringbetweentheblocks.選項(xiàng)：A、12NB、22NC、18ND、25N正確答案:【12N】3、問題：Ifanobjectofmassmmoveswithconstantvelocityv,thenetforceontheobjectis選項(xiàng)：A、mgB、mvC、mv/tD、0正確答案:【0】4、問題：Alargecrateofmassmisplacedonthebackofatruckbutnottieddown.Asthetruckacceleratesforwardwithanaccelerationa,thecrateremainsatrestrelativetothetruck.Whatforcecausesthecratetoaccelerateforward?選項(xiàng)：A、thenormalforceB、theforceofgravityC、theforceoffrictionbetweenthecrateandthefloorofthetruckD、noneofthechoicesarecorrect正確答案:【theforceoffrictionbetweenthecrateandthefloorofthetruck】5、問題：Ifduringagivenphysicalprocesstheonlyforceactingonanobjectisfriction,whichofthefollowingmustbeassumedinregardtotheobject'skineticenergy?選項(xiàng)：A、ItdecreasesB、ItincreasesC、ItremainsconstantD、Itcannotbedeterminedfromtheinformationgiven正確答案:【Itcannotbedeterminedfromtheinformationgiven】6、問題：Whichofthefollowingisthatformofenergyassociatedwithanobject'smotion?選項(xiàng)：A、PotentialB、ThermalC、Bio-chemicalD、Kinetic正確答案:【Kinetic】7、問題：Theworkdonebystaticfrictioncanbe:選項(xiàng)：A、PositiveB、NegativeC、ZeroD、Anyoftheothers正確答案:【Anyoftheothers】8、問題：Thequantityofworkequaltoonejouleisalsoequivalenttowhichofthefollowing?選項(xiàng)：A、WattB、Watt/sC、Watt?sD、Watt/s^2正確答案:【W(wǎng)att?s】9、問題：OnekilogramofgoldwouldhavegreatervalueonEarththanontheMoon.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】10、問題：Anobjectcanmoveevenwhennoforceactsonit.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】Pre-Coursepreparation1、問題：Workisascalarquantity,eventhoughit'scalculatedbyusingtwovectorquantities(forceanddisplacement).選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】2、問題：Workandpoweraresamethingsincebothoftheminvolvetheamountofenergytransferred.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】3、問題：Conservationmeansthepreservationofaphysicalquantityduringtransformationsorreactions.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】Unittest31、問題：Aboycaughtaballofmass200gmovingwithaspeedof30m/s.Ifthecatchingprocessbecompletedin0.1s,theaveragenetforceofimpactexertedbytheballonthehandsoftheboyis選項(xiàng)：A、30NB、20NC、40ND、60N正確答案:【60N】2、問題：AlexandJohnareloadingidenticalcabinetsontoatruck.Alexliftshiscabinetstraightupfromthegroundtothebedofthetruck,whereasJohnslideshiscabinetuparoughramptothetruck.Whichstatementiscorrectabouttheworkdoneonthecabinet–Earthsystem?選項(xiàng)：A、AlexandJohndothesameamountofwork.B、AlexdoesmoreworkthanJohn.C、JohndoesmoreworkthanAlex.D、Noneofthosestatementsisnecessarilytruebecausetheangleoftheinclineisunknown.正確答案:【JohndoesmoreworkthanAlex.】3、問題：Aballofclayfallsfreelytothehardfloor.Itdoesnotbouncenoticeably,anditveryquicklycomestorest.What,then,hashappenedtotheenergytheballhadwhileitwasfalling?選項(xiàng)：A、Ithasbeenusedupinproducingthedownwardmotion.B、Ithasbeentransformedbackintopotentialenergy.C、Ithasbeentransferredintotheballbyheat.D、Itisintheballandfloor(andwalls)asenergyofinvisiblemolecularmotion.正確答案:【Itisintheballandfloor(andwalls)asenergyofinvisiblemolecularmotion.】4、問題：Iftwoparticleshaveequalmomentum,aretheirkineticenergiesequal?選項(xiàng)：A、yes,alwaysB、no,neverC、no,exceptwhentheirspeedsarethesameD、yes,aslongastheymovealongparallellines正確答案:【no,exceptwhentheirspeedsarethesame】5、問題：Anatomicnucleussuddenlyburstsapart(fissions)intotwopieces.Onepiecetravelsoffthetheleftandanotherpiecetravelsofftotheright.Thelighterfragmenthas________speed.選項(xiàng)：A、greaterB、smallerC、sameD、anuncertain正確答案:【greater】6、問題：Atoneinstant,thecenterofmassofasystemoftwoparticlesislocatedonthex-axisatx=2.0m.Oneoftheparticlesisattheorigin.Theotherparticlehasamassof0.10kgandisatrestonthex-axisatx=8.0m.Themassoftheparticleattheoriginis(kg).選項(xiàng)：A、0.5B、0.3C、1.3D、1.8正確答案:【0.3】7、問題：Idropa60-ggolfballfrom2.0mhigh.Itreboundsto1.5m.Howmuchenergyislost?選項(xiàng)：A、0.29JB、0.50JC、0.88JD、1.0J正確答案:【0.29J】8、問題：Agirlandherbicyclehaveatotalmassof40kg.Atthetopofthehillherspeedis5.0m/s.Thehillis10mhighand100mlong.Iftheforceoffrictionassheridesdownthehillis20N,whatisherspeedatthebottom?選項(xiàng)：A、5.0m/sB、10m/sC、11m/sD、Shestopsbeforeshereachesthebottom.正確答案:【11m/s】9、問題：Ablockisprojectedwithspeedvacrossahorizontalsurfaceandslidestoastopduetofriction.Thesameblockisthenprojectedwiththesamespeedvupaninclinewhereisslidestoastopduetofriction.Inwhichcasedidthetotalmechanicalenergyoftheblockdecreasetheleast?選項(xiàng)：A、Thisproblemcannotbesolvedsinceitwasnotindicatedwhetherthehorizontalsurfaceandtheinclinebothhadthesamecoefficientofkineticfriction.B、Thecaseonthehorizontalsurfacehadtheleastdecreaseintotalmechanicalenergy.C、Thecaseontheinclinedsurfacehadtheleastdecreaseintotalmechanicalenergy.D、Noneoftheothers.正確答案:【Thecaseontheinclinedsurfacehadtheleastdecreaseintotalmechanicalenergy.】10、問題：Whichofthefollowingisanexampleofanonconservativeforce?選項(xiàng)：A、gravitationalforceB、electricforceC、frictiontionalforceD、noneoftheothers正確答案:【frictiontionalforce】Pre-coursepreparation1、問題：Abodyissaidtobearigidbody,whenithasperfectlydefiniteshapeandsize.Thedistancebetweenallpointsofparticlesofsuchabodydonotchange,whileapplyinganyforceonit選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】2、問題：Thereare2πradiansinonecompleterevolution.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】3、問題：Torqueisameasureoftheforcethatcancauseanobjecttorotateaboutanaxis.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】Unittest41、問題：Agrindstoneincreasesinangularspeedfrom4.00rad/sto12.00rad/sin4.00s.Throughwhatangledoesitturnduringthattimeintervaliftheangularaccelerationisconstant?選項(xiàng)：A、8.00radB、12.00radC、16.0radD、32.0rad正確答案:【32.0rad】2、問題：Consideranobjectonarotatingdiskadistancerfromitscenter,heldinplaceonthediskbystaticfriction.Whichofthefollowingstatementsisnottrueconcerningthisobject?選項(xiàng)：A、Iftheangularspeedisconstant,theobjectmusthaveconstanttangentialspeed.B、Iftheangularspeedisconstant,theobjectisnotaccelerated.C、Theobjecthasatangentialaccelerationonlyifthediskhasanangularacceleration.D、Ifthediskhasanangularacceleration,theobjecthasbothacentripetalaccelerationandatangentialacceleration.正確答案:【Iftheangularspeedisconstant,theobjectisnotaccelerated.】3、問題：Aconstantnettorqueisexertedonanobject.Whichofthefollowingquantitiesfortheobjectcannotbeconstant?選項(xiàng)：A、NoneoftheseanswersB、angularaccelerationC、momentofinertiaD、kineticenergy正確答案:【kineticenergy】4、問題：AsolidaluminumsphereofradiusRhasmomentofinertiaIaboutanaxisthroughitscenter.Willthemomentofinertiaaboutacentralaxisofasolidaluminumsphereofradius2Rbe選項(xiàng)：A、2IB、4IC、8ID、32I正確答案:【32I】5、問題：Aniceskaterstartsaspinwithherarmsstretchedouttothesides.Shebalancesonthetipofoneskatetoturnwithoutfriction.Shethenpullsherarmsinsothathermomentofinertiadecreasesbyafactorof2.Intheprocessofherdoingso,whathappenstoherkineticenergy?選項(xiàng)：A、Itincreasesbyafactorof4.B、Itincreasesbyafactorof2.C、Itdecreasesbyafactorof2.D、Itdecreasesbyafactorof4.正確答案:【Itincreasesbyafactorof2.】6、問題：Consideranisolatedsystemmovingthroughemptyspace.Thesystemconsistsofobjectsthatinteractwitheachotherandcanchangelocationwithrespecttooneanother.Whichofthefollowingquantitiescanchangeintime?選項(xiàng)：A、Theangularmomentumofthesystem.B、Thelinearmomentumofthesystem.C、Boththeangularmomentumandlinearmomentumofthesystem.D、Neithertheangularmomentumnorlinearmomentumofthesystem.正確答案:【Neithertheangularmomentumnorlinearmomentumofthesystem.】7、問題：Twoponiesofequalmassareinitiallyatdiametricallyoppositepointsontherimofalargehorizontalturntablethatisturningfreelyonafrictionless,verticalaxlethroughitscenter.Theponiessimultaneouslystartwalkingtowardeachotheracrosstheturntable.Astheywalk,whathappenstotheangularspeedoftheturntable?選項(xiàng)：A、Itincreases.B、Itdecreases.C、Itstaysconstant.D、NotSure正確答案:【Itincreases.】8、問題：Aturntablerotateswithaconstantangularacceleration.After4.00sithasrotatedthroughanangleof60.0rad.Theangularvelocityofthewheelatthebeginningofthe4.00sintervalwas選項(xiàng)：A、10.5rad/sB、19.5rad/sC、14.5rad/sD、17.5rad/s正確答案:【10.5rad/s】9、問題：Asolid,uniformcylinderwithmass8.25kganddiameter15.0cmisspinningat220rpmonathin,frictionlessaxlethatpassesalongthecylinderaxis.Youdesignasimplefrictionbraketostopthecylinderbypressingthebrakeagainsttheouterrimwithanormalforce.Thecoefficientofkineticfrictionbetweenthebrakeandrimis0.333.Whatmusttheappliednormalforcehetobringthecylindertorestafterithasturnedthrough5.25revolutions?選項(xiàng)：A、14.9NB、24.9NC、7.47ND、5.47N正確答案:【7.47N】10、問題：Twoparticlesofdifferentmassstartfromrest.Thesamenetforceactsonbothofthemastheymoveoverequaldistances.Howdotheirfinalkineticenergiescompare?選項(xiàng)：A、Theparticleoflargermasshasmorekineticenergy.B、Theparticleofsmallermasshasmorekineticenergy.C、Theparticleshaveequalkineticenergies.D、Eitherparticlemighthavemorekineticenergy.正確答案:【Theparticleshaveequalkineticenergies.】Pre-coursepreparation1、問題：RelativitygenerallyreferstotwotheoriesofAlbertEinstein,hisSpecialTheoryofRelativityandhisGeneralTheoryofRelativity.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】2、問題：Specialrelativitycannotbeappliedtoclassicalmechanicsproblems.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】3、問題：SpecialtheoryofrelativitybyEinstein(1905)providesextremelyaccurateresultsaslongasthedomainofstudyisrestrictedtolargeobjectsandthespeedsinvolveddonotapproachthespeedoflight.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】Unittest51、問題：Inordertoreduceyourthicknessby40%toanobserveratrest,whatisthespeedwithwhichyoumustbemovingrelativetotheobserver?選項(xiàng)：A、0.8cB、0.6cC、0.4cD、0.2c正確答案:【0.8c】2、問題：Toappeartobethintoobserversatrest,ayoungmanstartsridingaspacecraft.Toreducehisthicknessexactlybyhalf,thespeedatwhichthespacecraftmustmoveis選項(xiàng)：A、0.5cB、0.866cC、0.73cD、0.95c正確答案:【0.866c】3、問題：Inthelaboratoryframeofreference,themomentumofaparticleofrestmassmisfoundtobe4mc/3withcthespeedoflightinvacuum.Whatisthespeedoftheparticleinthelaboratoryframeofreference?選項(xiàng)：A、4c/5B、3c/5C、3c/4D、c/4正確答案:【4c/5】4、問題：Whichstatementiscorrectaboutthespecialrelativity?選項(xiàng)：A、Thelengthhasnothingtodowiththereferencesystem.B、Thespeedoflighthasnothingtodowiththereferencesystem.C、Themasshasnothingtodowiththereferencesystem.D、Timehasnothingtodowiththereferencesystem.正確答案:【Thespeedoflighthasnothingtodowiththereferencesystem.】5、問題：AspacecraftzoomspasttheEarthwithaconstantvelocity.AnobserverontheEarthmeasuresthatanundamagedclockonthespacecraftistickingatonethirdtherateofanidenticalclockontheEarth.WhatdoesanobserveronthespacecraftmeasureabouttheEarth-basedclock’stickingrate?選項(xiàng)：A、Itrunsmorethanthreetimesfasterthanhisownclock.B、Itrunsthreetimesfasterthanhisown.C、Itrunsatone-thirdtherateofhisownD、Itrunsatlessthanone-thirdtherateofhisown.正確答案:【Itrunsatone-thirdtherateofhisown】6、問題：Anastronautistravelinginaspacecraftinouterspaceinastraightlineataconstantspeedof0.500c.Whichofthefollowingeffectswouldsheexperience?選項(xiàng)：A、Shewouldfeelheavier.B、Shewouldfindithardertobreathe.C、Herheartratewouldchange.D、Noneofthoseanswersiscorrect.正確答案:【Noneofthoseanswersiscorrect.】7、問題：Adistantastronomicalobject(aquasar)ismovingawayfromusathalfthespeedoflight.Whatisthespeedofthelightwereceivefromthisquasar?選項(xiàng)：A、greaterthancB、cC、betweenc/2andcD、c/2正確答案:【c】8、問題：AspacecraftbuiltintheshapeofaspheremovespastanobserverontheEarthwithaspeedof0.500c.Whatshapedoestheobservermeasureforthespacecraftasitgoesby?選項(xiàng)：A、asphereB、acigarshape,elongatedalongthedirectionofmotionC、aroundpillowshape,flattenedalongthedirectionofmotionD、aconicalshape,pointinginthedirectionofmotion正確答案:【aroundpillowshape,flattenedalongthedirectionofmotion】9、問題：Asacarheadsdownahighwaytravelingataspeedvawayfromagroundobserver,whichofthefollowingstatementsaretrueaboutthemeasuredspeedofthelightbeamfromthecar’sheadlights?Morethanonestatementmaybecorrect.選項(xiàng)：A、Thegroundobservermeasuresthelightspeedtobec+vB、ThedrivermeasuresthelightspeedtobecC、ThegroundobservermeasuresthelightspeedtobecD、Thedrivermeasuresthelightspeedtobec+v正確答案:【Thedrivermeasuresthelightspeedtobec#Thegroundobservermeasuresthelightspeedtobec】10、問題：Whichofthefollowingstatementsarefundamentalpostulatesofthespecialtheoryofrelativity?Morethanonestatementmaybecorrect.選項(xiàng)：A、Lightmovesthroughasubstancecalledtheether.B、Thespeedoflightdependsontheinertialreferenceframeinwhichitismeasured.C、Thelawsofphysicsdependontheinertialreferenceframeinwhichtheyareused.D、Thelawsofphysicsarethesameinallinertialreferenceframes.E、Thespeedoflightisindependentoftheinertialreferenceframeinwhichitismeasured.正確答案:【Thelawsofphysicsarethesameinallinertialreferenceframes.#Thespeedoflightisindependentoftheinertialreferenceframeinwhichitismeasured.】Pre-coursepreparation1、問題：Anexperimentshowsthatanelectronandapositroncanbeproducedafterahigh-energygammaraycollideswithahydrogenatom.Thisisanexperimentalevidenceforaviolationofprincipleofconservationofcharge.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】2、問題：Atestchargeisapointchargeofaenoughsmallmagnitudeanditcanbeeitherpositiveornegative.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】3、問題：Anelectricdipoleisapairofpointchargeswithequalmagnitudeandoppositesign(apositivechargeqandanegativecharge-q)separatedbyadistanced.Electricdipolemomentisascalarquantityandisdifinedasqd.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】UnitTest61、問題：Electricchargeisdistributeduniformlyalonganinfinitelineinvacuum(thelinearchargedensityis).Theforceonatestchargeatadistancerfromthelineis().(isaunitvector.)選項(xiàng)：A、B、C、D、正確答案:【】2、問題：Anelectricdipolewithdipolemomentisparalleltoalonglineofchargewithlinearchargedensityandatadistancefromtheline.Themagnitudeoftorqueonthedipoleequals().選項(xiàng)：A、B、C、D、正確答案:【】3、問題：TwoparalleplateswithareaAaregivenchargesQuniformly.Theirseparationismuchsmallerthanthedimensionsoftheplatesandthefringingeffectisneglected.Whatisthemagnitudeoftheelectricforceononeplateexertedbytheother?選項(xiàng)：A、B、C、D、0正確答案:【】4、問題：Anelectricdipolewithdipolemomentisinauniformelectricfield.Ifthedipoleisinthestableequilibriumstate,whichofthefollowingstatementsiscorrect?選項(xiàng)：A、Thetorqueiszeroandpotentialenergyisminimum.B、Thetorqueiszeroandpotentialenergyismaximum.C、Thetorqueismaximumandpotentialenergyisminimum.D、Thetorqueismaximumandpotentialenergyismaximum.正確答案:【Thetorqueiszeroandpotentialenergyisminimum.】5、問題：Achargeisplacedattheoriginofacoordinatesystemandachargeislocatedatonthex-axis.Theforceonisfoundtobe.Athirdchargeonthex-axis.Whatisthenetforceonnow?isnowplacedat選項(xiàng)：A、0B、C、D、正確答案:【】6、問題：Figureshowsaringofradiuswithanarrowgapof()andlinearchargedensity.ThemagnitudeoftheelectricfieldatthecenterOoftheringis（）.選項(xiàng)：A、B、0C、D、uncertain正確答案:【】7、問題：Anelectricdipolewithdipolemomentisplacednearalargeplanesheetwithasurfacechargedensity.Ifmakesanangleofwiththenormalofthesheet,themagnitudeofthetorqueexertedonthedipoleis().選項(xiàng)：A、B、C、D、正確答案:【】8、問題：ThefourelectricdipolesareintheuniformelectricfieldinFigure.Whichoneisatthestableequilibriumstate?選項(xiàng)：A、aB、bC、cD、d正確答案:【d】9、問題：Bycomparisonwiththeforceofgravity,theelectricalattractionbetweenanelectronandaproton選項(xiàng)：A、isjustaboutthesamesize.B、isverymuchstonger.C、isverymuchweaker.D、cannotbecompared.正確答案:【isverymuchstonger.】10、問題：Twolightweightmetalspheresaresuspendedneareachotherfrominsulatingthreads.Onespherehasanetcharge;theotherspherehasnonetcharge.Thesphereswill選項(xiàng)：A、attracteachother.B、exertnonetelectrostaticforceoneachother.C、repeleachother.D、doanyofthesethingsdependingonthesignofthechargeontheonesphere.正確答案:【attracteachother.】11、填空題：Anelectricdipoleisplacedinauniformelectricfieldwithperpendicularto.Theworkdonebytheelectricfieldtotheelectricdipoleintheprocessthatrotatesfromtheorientationinthefiguretothedirectionofis_____.正確答案:【pE##%_YZPRLFH_%##Ep##%_YZPRLFH_%##p*E##%_YZPRLFH_%##E*p】12、填空題：Inauniformelectricfield,anelectricdipolewithdipolemomentpointsinthedirectionoffield.Thetorqueonthedipoleis.正確答案:【0##%_YZPRLFH_%##zero】13、填空題：Anelectricdipolewithdipolemomentisinauniformelectricfield.Whenthedipoleisintheunstableequilibriumstate,theanglebetweenandisindegree.正確答案:【180##%_YZPRLFH_%##180.##%_YZPRLFH_%##180.0】Pre-coursepreparation:conceptualunderstanding1、問題：GaussiansurfaceusedinGauss'slawisarealclosedsurfacewhichexistsinanelectricfield.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】2、問題：Theelectricfluxisascalaranditmustbepositive.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】3、問題：Gauss'slawprovidesarelationshipbetweentheelectricfieldonaclosedsurfaceandthechargedistributionwithinthatsurface.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】UnitTest71、問題：Aconductingspherewithradiusandchargeisplacednearaverylargenonconductingplanesheetwithsurfacechargedensity.Undertheconditionofelectrostaticequilibrium,themagnitudeofelectricfieldatcenterofthesphereproducedbythechargeontheconductingsphereis選項(xiàng)：A、0B、C、D、正確答案:【】2、問題：FourpointchargesQ1,Q2,Q3,Q4areinspace.Sisaclosedsurface.EisthemagnitudeoftheelectricfieldatanarbitrarypointonsurfaceSanddenotestheelectricfluxthroughS.IfthechargeQ1ismovedfrompointatopointbalongthedashedline,whichofthefollowingstatementsistrue?選項(xiàng)：A、BothEandFEchange.B、BothEandFEdonotchange.C、EchangesbutFEdoesnotchange.D、EdoesnotchangebutFEchanges.正確答案:【EchangesbutFEdoesnotchange.】3、問題：Shownaretheelectricfieldlinesfortwopointchargeswithasmalldistancebapart.Theratioq1/q2equals選項(xiàng)：A、3B、-3C、1/3D、-1/3正確答案:【-1/3】4、問題：InwhichofthefollowingcontextscanGauss’slawbeappliedtofindtheelectricfieldeasily?選項(xiàng)：A、ApointatadistanceLfromauniformlychargedwirewithlengthL.B、Apointverynearthesurfaceofalargeuniformlychargedplanesheet.C、ApointbesideachargeddiskwithradiusR.D、ApointoutsideauniformlychargedcubeofsidelengthL.正確答案:【Apointverynearthesurfaceofalargeunifo