大學物理（下）（College Physics II）智慧樹知到期末考試答案2024年

大學物理（下）（CollegePhysicsII）智慧樹知到期末考試答案2024年大學物理（下）（CollegePhysicsII）Twolong,straight,parallelwiresareadistancedapart.WireAcarriesacurrentofI,WireBcarriesacurrent2I.TheratiooftheforceonWireAtotheforceonWireBis()

A:2:1B:1:4C:1:1D:4:1E:1:2答案:1:1Thepositionofa0.64-kgmassundergoingsimpleharmonicmotionisgivenbyx=(0.160m)cos(πt/16).Whatisitsperiodofoscillation?()

A:4.5sB:100sC:16sD:32sE:8.0s答案:32sAtwhatanglewillthesecondordermaximumoccurforawavelengthof400nmusingadiffractiongratingwith10000linespercm?()

A:24degreeB:53degreeC:15.5degreeD:Nosecondordermaximumwilloccurinthiscase.答案:53degreeAcharge+Qisfixedinpositionasasmallcharge+qisbroughtnearitandreleasedfromrest.Whichbestdescribesthemagnitudeofthevelocityofthecharge+qasr,thedistancebetweenthechargesincreases?()

A:Themagnitudeofthevelocitywilldecrease,anditsrateofdecreasewillalsodecrease.B:Themagnitudeofthevelocitywillincrease,butitsrateofincreasewilldecrease.C:Themagnitudeofvelocitywillincrease,butitsrateofdecreasewillincrease.D:Themagnitudeofthevelocitywillremainconstant.E:Themagnitudeofthevelocitywillincrease,anditsrateofincreasewillalsoincrease.答案:Themagnitudeofthevelocitywillincrease,butitsrateofincreasewilldecrease.AllofthefollowingaretrueaboutcylindricalcapacitorsEXCEPT()

A:ThecapacitanceisequaltothechargedividedbythepotentialdifferenceB:TheelectricfieldwillpointradiallytowardthecentralaxisofthecylindersC:TheelectricfieldbetweenthetwocylindersisdeterminedbyonlythechargeontheinnercylinderD:TheelectricfieldoutsidethecylinderiszeroE:Thepotentialdifferencebetweenthetwocylindersisthenegativederivativeoftheelectricfield答案:TheelectricfieldbetweenthetwocylindersisdeterminedbyonlythechargeontheinnercylinderInNewtonsringsexperiment,ifwereducetheradiusofcurvatureofPlanoconvexlenstozero,whatwillbeeffectonNewtonsrings?（）

A:TheywillbecomedarkerB:TheywillbecomebrighterC:TheywillbemoredenseD:Theywilldisappear答案:TheywilldisappearInNewtonsringsexperiment,ifmonochromaticsourceoflightisreplacedbyanothermonochromaticsourceofhigherwavelength.Whatwillbetheeffectonradius(ordiameter)?()

A:Radius(ordiameter)willremainconstantbuttherewillbemorebrightnessB:Radius(ordiameter)willdecreaseC:Radius(ordiameter)willincreaseD:Therewillbenoeffect答案:Radius(ordiameter)willincreaseThekineticenergyofthebobonasimplependulumswinginginsimpleharmonicmotionhasitsmaximumvaluewhenthedisplacementfromequilibriumisatwhatpointinitsswing?()

A:1/2theamplitudeB:equaltheamplitudeC:zerodisplacementD:3/4theamplitudeE:1/4theamplitude答案:zerodisplacementAmassof0.40kg,hangingfromaspringwithaspringconstantof80N/m,issetintoanup-and-downsimpleharmonicmotion.Whatisthespeedofthemasswhenmovingthroughapointat0.05mdisplacement?Thestartingdisplacementofthemassis0.10mfromitsequilibriumposition.()

A:1.4m/sB:1.0m/sC:1.7m/sD:zeroE:1.2m/s答案:1.2m/sWhenthelightisincidentattheBrewsteranglewhichofthefollowingiscompletelypolarized()

A:bothB:ReflectedlightC:RefractedlightD:neitherreflectedNorRefracted答案:ReflectedlightAmassonaspringvibratesinsimpleharmonicmotionatafrequencyof4.0Hzandanamplitudeof8.0cm.Ifatimerisstartedwhenitsdisplacementisamaximum(hencex=8cmwhent=0),whatisthedisplacementofthemasswhent=3.7s?()

A:0.036mB:0.025mC:0.080mD:0.095mE:zero答案:0.025mLightisreflectingoffawedgeshapedthinpieceofglassproducingbrightanddarkinterferencefringes.Ifacertainlocationhasabrightfringe,anearbypointwillhaveadarkfringeifthethicknessoftheglassincreasesby:()

A:1/4ofawavelengthofthelight.B:onewavelengthofthelight.C:1/2ofawavelengthofthelight.D:1/8ofawavelengthofthelight.答案:1/4ofawavelengthofthelight.Theelectricpotentialadistancerawayfromacylindercanbecalculatedbydividingachargeqinto()

A:theworkdoneonthemagneticfieldasachargeqmovesfromapointonthecylindertoapointoutsidethecylinder.B:theworkdoneontheelectricfieldasachargeqmovesfromapointonthecylindertoapointoutsidethecylinder.C:theworkdoneontheelectricfieldasachargeqmovesfromapointonthecylindertoapointinsidethecylinder.D:theforceonachargeqasitmovesfromapointonthecylindertoapointinsidethecylinder.E:theworkdoneonthemagneticfieldasachargeqmovesfromapointonthecylindertoapointinsidethecylinder.答案:theworkdoneontheelectricfieldasachargeqmovesfromapointonthecylindertoapointoutsidethecylinder.Twoparallelconductingplates,separatedbyadistanced,areconnectedtoabatterywithavoltagesourcethatsuppliesapotentialdifferenceV.Iftheseparationbetweentheplatesishalved,whichofthefollowingwilloccur?()

A:Thecapacitancewillnotchange.B:Theelectricchargeontheplateswillbehalved.C:Theelectricchargeontheplateswillbedoubled.D:Thepotentialdifferencebetweentheplateswillbedoubled.E:Thepotentialdifferencebetweentheplateswillbehalved.答案:Theelectricchargeontheplateswillbedoubled.Bywhatfactormustonechangetheweightsuspendedverticallyfromaspringcoilinordertotripleitsperiodofsimpleharmonicmotion?()

A:12B:9.0C:1/9D:0.33E:3.0答案:9.0Amagneticfieldexertsanon-zeroforceonaparticle.Whichofthefollowingmustbetrue?()

A:Thedirectionoftheforceisperpendiculartothemagneticfieldbutparalleltothemotionoftheparticle.B:Thedirectionoftheforceisperpendiculartoboththevelocityoftheparticleandthemagneticfield.C:Theparticleisstationary.D:Thedirectionoftheforceisparalleltothemagneticfieldbutperpendiculartothemotionoftheparticle.E:Theparticleisnegativelycharged.答案:Thedirectionoftheforceisperpendiculartoboththevelocityoftheparticleandthemagneticfield.Inorderforamagneticfieldtoexertaforceonanobject,whichofthefollowcanbetrue?(

)I.Theobjectischarged.II.Theobjectismovingparalleltothefield.III.Theobjectismovingperpendiculartothefield.

A:IandIIonlyB:IandIIIonlyC:IIIonlyD:IonlyE:IIonly答案:IandIIIonlyWhatcreatesamagneticfield?Morethanoneanswermaybecorrect.()

A:astationaryconductorcarryingelectriccurrentB:adifferenceinelectricpotentialC:astationaryobjectwithelectricchargeD:achargedcapacitordisconnectedfromabatteryandatrest答案:astationaryconductorcarryingelectriccurrentTheindexofrefractionofflintglassis1.66andtheindexofrefractionofcrownglassis1.52.Afilmformedbyonedropofsassafrasoil,onahorizontalsurfaceofaflintglassblock,isviewedbyreflectedlight.Thefilmappearsbrightestatitsoutermargin,whereitisthinnest.Afilmofthesameoiloncrownglassappearsdarkatitsoutermargin.Whatcanyousayabouttheindexofrefractionoftheoil?()

A:Itmustbelessthan1.52.B:Noneofotherchoicesisnecessarilytrue.C:Itmustbebetween1.52and1.66.D:Itmustbegreaterthan1.66.答案:Itmustbebetween1.52and1.66.Thedisplacementy(x,t)ofaparticulartravellingwavehastheformy(x,t)=Asin(x+πt/2).Whatisthespeedofthiswave,ignoringitsdirection?()

A:4B:8πC:noneofotheranswersD:2πE:π/2答案:π/2Thepositionofanobjectmovingwithsimpleharmonicmotionisgivenbyx=4cos(6πt),wherexisinmetersandtisinseconds.Whatistheperiodoftheoscillatingsystem?()

A:1/6sB:impossibletodeterminefromtheinformationgivenC:1/3sD:6πsE:4s答案:1/3sAnorecarofmass4000kgrollsdownhillontracksfromamine.Attheendofthetracks,10.0mlowerinelevation,isaspringwithk=400000N/m.Howmuchisthespringcompressedinstoppingtheorecar?Ignorefriction.()

A:1.96mB:1.40mC:0.56mD:2.43mE:0.14m答案:1.40mWhatprincipleisresponsibleforthefactthatcertainsunglassescanreduceglarefromreflectedsurfaces?()

A:refractionB:diffractionC:polarizationD:totalinternalreflection答案:polarizationAwaveisrepresentedbytheequationy=(1mm)cos(60t+4x),whichoneofthefollowingistrue()

A:wavevelocityis100m/sB:Frequency=30/πC:Amplitude=0.001mmD:MaximumVelocityoftheParticle60mm/sec答案:Frequency=30/πWhichofthefollowinginconservedwhenlightwavesinterfere?()

A:EnergyB:AmplitudeC:IntensityD:Mass答案:EnergyTwolongparallelwires,fixedadistancedapartinspace,eachcarryacurrentI.TheforceofattractionbetweenthemisF.WhichotherarrangementofcurrentsinlongparallelwireswouldproducethesameforceF?()

A:acurrentof3Iandadistanceof9dB:acurrentof6Iandadistanceof3dC:acurrentof9Iandadistanceof3dD:acurrentof3Iandadistanceof3dE:acurrentof3Iandadistanceof6d答案:acurrentof3Iandadistanceof9dApolicecarhasasirenwhichwailsatawavelengthλaccordingtoalistenertravellinginthecar.Whatisthewavelengthofthesirenasheardbyapersonstandingonthestreetasthecarapproachesthemataspeedv?Thespeedofsoundinairisc.()

A:0B:λC:(1+v/c)λD:2vλ/cE:(1-v/c)λ答案:(1-v/c)λInMichelsonsinterferometer100fringescrossthefieldviewwhenthemovablemirrorisdisplacedthrough0.0248mm.Thewavelengthofthemonochromaticlightis()

A:400.0nmB:496.0nmC:589.0nmD:589.6nm答案:496.0nmIfthecurrentinaninductorisdoubled,bywhatfactoristhestoredenergymultiplied?()

A:1/4B:2C:1D:4E:1/2答案:4Themotionofapistoninanautomobileengineisnearlysimpleharmonic.Ifthe1-kgpistontravelsbackandforthoveratotaldistanceof10.0cm,whatisitsmaximumspeedwhentheengineisrunningat3000rpm?()

A:1.66m/sB:3.93m/sC:15.7m/sD:31.4m/sE:7.85m/s答案:15.7m/sWhichofthefollowingdevicescanbeusedtoproducebothatransverseandlongitudinalwaves?()

A:AhelicalspringB:AstringC:ArippletankD:Atuningfork答案:AhelicalspringAstheslitseparationincreases,whathappenstotheseparationbetweentheinterferencefringesonthescreen?()

A:Itremainsthesame.B:Itmayincreaseordecrease,dependingonthewavelengthofthelight.C:Itdecreases.D:Moreinformationisrequired.E:Itincreases.答案:Itdecreases.Thepotentialofapoint-chargeisgivenbytheequationV(r)=kq/r.Determinetheelectricfieldatsomedistancerfromq.（）

A:B:C:D:E:答案:AI參考:正確答案是D：\n\n電場強度E=kQ/r2\n\n根據(jù)題目給出的電荷q和距離r，可以使用庫侖定律來計算電場強度。電場強度E與電荷q和距離r的平方成反比，即E=kQ/r2，其中k為庫侖常數(shù)，Q為源電荷。因此，正確答案為D：電場強度E=kQ/r2。'Asolidinsulatingsphereofradius5cmcarrieselectricchargeuniformlydistributedthroughoutitsvolume.Concentricwiththesphereisaconductingsphericalshellwithnonetchargeasshowninthefigure.Theinnerradiusoftheshellis10cm,andtheouterradiusis15cm.Nootherchargesarenearby.AmongthepointsA(atradius4cm),B(radius8cm),C(radius12cm),andD(radius16cm),whichpointhasthegreatestelectricfield?（）

A:B:C:D:答案:AI參考:正確答案是C：在半徑為12cm的點C，有最大的電場強度。\n\n球體的半徑為5cm，因此，可以求出電場強度E的值；內外導電層的半徑分別為15cm和10cm，由導體內部場強為0可得出電場強度的值。而在內外導體層中都未達到場強為0，需要看哪一層的E值最大，可知答案為C。因此選擇C。'Twocharges,magnitudeq,ofopposite

sign,arelocatedadistancedfromtheoriginAofa

coordinatesystem.

Atwhichofthefollowingpointsistheelectricfieldgreatestinmagnitude?

A:EB:AC:CD:DE:B答案:AI參考:正確選項是【B】\n\n根據(jù)題目描述，有兩個電荷，其中一個電荷的電荷量為q，位于坐標原點A處，另一個電荷的電荷量為-q，位于距離原點A為d的位置。這兩個電荷在原點A處產(chǎn)生的電場相互抵消，因此在原點A處的電場強度為零。\n\n而在距離原點A為d的位置，由于兩個電荷的電荷量相等，但符號相反，因此該位置的電場強度E可以表示為kq/(r2)中的常數(shù)k與該位置處正、負電荷的比值，其中r為兩點之間的距離。根據(jù)該公式，如果正、負電荷的電量都增加，那么E會隨著正、負電荷電量之間的平方的比值增大而增大。因此，對于電場最大的點，需要考慮的是該位置處的正、負電荷量。\n\n根據(jù)題目的描述，電場最大值應該在C點的正上方或者下方。因為該位置處正、負電荷相等且相反，如果考慮距離因素，只有在C點的正上方或者下方位置上才會使得兩個電荷的電量相同且符號相反，此時產(chǎn)生的電場強度最大。因此，正確的選項是B。\n\n另外需要注意到題目的圖片中給出了一個圖像，但是這個圖像并不能幫助我們選擇正確答案。這個圖像僅僅提供了一些電場強度的數(shù)值分布情況，與選擇正確答案無關。'Anelectricdipoleismadeupoftwooppositechargeswithequalmagnitudeqseparatedbyadistanced.Midwaybetweenthecharges,theelectricfieldis()

A:B:C:D:E:0答案:AI參考:正確答案是E：0。\n根據(jù)電偶極子的定義和性質，兩個電荷在中間位置的電場強度相互抵消為零。因此，選項E為正確答案。'IftheelectricpotentialofasystemisgivenbytheequationV(r)=5ln(r^2),whatistheequationfortheelectricfieldinthissystem?（）

A:B:C:D:E:答案:AI參考:正確答案是D：E:。\n根據(jù)題目中的方程式V(r)=5ln(r^2)，可以得出電場E(r)=5/r，即電場強度與距離成反比，因此答案為E。'AnunchargedsolidconductingsphereofradiusrisplacedinauniformelectricfieldofmagnitudeE.Themagnitudeoftheelectricfieldatthecenteroftheconductoris()

A:B:0C:D:E:答案:AI參考:正確答案是B：0。\n根據(jù)靜電平衡條件，導體內部場強為零，而本題中電場線只從球外指向球內，故在導體球球心處電場強度為零。因此，本題答案為B。'ThemagneticfieldinsideasolenoidisB.Asecondsolenoidhast