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Universityphysics智慧树知到课后章节答案2023年下浙江理工大学浙江理工大学第一章测试1.Howmanyyearsolderwillyoube1.00gigaseeondfromnow?(Assumea365-dayyear.)（）A:21.7yB:51.7yC:31.7yD:41.7y答案:31.7y2.Scientificnotation:（）
A:B:C:D:
答案:
1.InΔABC,weknowthatDisapointontheextensionlineofBC,andEisthemidpointoflinesegmentAD.If,and,thenx=（）.A:−1/4B:1/4C:−1/3D:1/3答案:−1/42.Vectoroperation.If,and,findthevalueof,suchthatthevectorsandwillbeperpendiculartoeachother（）.A:-2/3B:-5/3C:-4/3D:-8/3答案:-4/3
1.Twodisplacementvectors, and ,havemagnitudesS=3mandT=4m,whichofthefollowingcouldnotbethemagnitudeofthedifferencevector?(Theremaybemorethanonecorrectanswer.)（ ）.A:9mB:1mC:7mD:5m答案:9m第二章测试2.Aparticleismovingstraightalongthexdirection,anditspositionisdeterminedbytheequation,wheretheunitofxismeter,andtheunitoftissecond.Thenitsvelocityisexpressedas（）A:v=20t+8B:v=20tC:v=10t+8D:v=10t答案:v=20t3.Velocityisavector,andspeedisalsoavector.（）A:对B:错答案:错4.Themagnitudeoftheaccelerationoftheobjectmaybeverylarge,whilethemagnitudeofthevelocityofanobjectcanremainunchanged.（）A:错B:对答案:对
1.Awarshipfirestheshellsattowenemyshipsatthesametime.Itisknownthattheshellswillflyalongtheparabolicorbitsasshowninthefigureandhittheenemyships,assumetheshellshasthesameinitialspeed,whichshipwillbehitfirst?（）A:ShipAB:ShipBC:MoreinformationisneededD:Bothshipswillbehitatthesametime答案:ShipB2.Acarmovesatconstantspeedinahorizontalofradius20.0m,makingacompletecirclein7.0s.Whatistheaccelerationofthecar?（）A:B:
C:D:
答案:第三章测试1.Supposeanastronautlandedonaplanetwhereg=19.6m/s2.Comparedtoearth,woulditbeforhertocatchaballthatismovinghorizontallyat12m/s?(Assumethattheastronaut’sspacesuitisalightweightmodelthatdoesn’timpedehermovementsinanyway.)（）A:harderB:easierC:justaseasyD:Moreinformationisneededtodetermine答案:justaseasy
1.Satellitesareheldinorbitbytheforceofourplanet’sgravitationalattraction.Asatelliteinasmall-radiusorbitmovesatahigherspeedthanasatelliteinanorbitoflargeradius.Basedonthisinformation,whatyoucanconcludeabouttheearth’sgravitationalattractionforthesatellite?（）A:Itincreaseswithincreasingdistancefromtheearth.B:Itisthesameatalldistancesfromtheearth.C:Itdecreaseswithincreasingdistancefromtheearth.D:Thisinformationbyitselfisn’tenoughtoanswerthequestion.答案:Itdecreaseswithincreasingdistancefromtheearth.2.Atrafficlightofweightwhangsfromtwolightweightcables,oneoneachsideofthelight.Eachcablehangsata45°anglefromthehorizontal.Whatisthetensionineachcable?（）A:B:
C:D:
答案:1.Thepersonintheelevatorholdsaspringscalewithaheavyobject.Nowthereadingofthespringscalesuddenlybecomeslarger(Thepersonnevermoves).Whatisthemovementoftheelevatoratthistime?（）A:Theelevatorisnowspeedingup.B:TheelevatornowrisesupataconstantspeedC:Theelevatorisnowspeedingdown.D:Theelevatornowdeceleratesandrises答案:Theelevatorisnowspeedingup.2.Consideraboxthatisplacedondifferentsurfaces.Inwhichsituation(s)istherenofrictionforceactingonthebox?( )
A: Theboxisatrestonaroughhorizontalsurface. B:Theboxisontherough-surfacedflatbedofatruck—thetruckismovingataconstantvelocityonastraightbuttiltedroad,andtheboxremainsinthesameplaceinthemiddleofthetruckbed.C:Theboxisontherough-surfacedflatbedofatruck—thetruckisspeedinguponastraight,levelroad,andtheboxremainsinthesameplaceinthemiddleofthetruckbed. D:Theboxisatrestonaroughtiltedsurface. 答案: Theboxisatrestonaroughhorizontalsurface. 第四章测试1.Inahydroelectricgeneratingstation,fallingwaterisusedtodriveturbines(“waterwheels”),whichinturnrunelectricgenerators.Comparedtotheamountofgravitationalpotentialenergyreleasedbythefallingwater,howmuchelectricalenergyisproduced?（）A:more;B:notenoughinformationgiventodecide.C:thesame;D:less.答案:less.2.HowmuchworkisdonebytheforceFactingonabodywhenthebodymovesfromx=0mtox=2.0mundertheforceof?（）
A:–24JB:-34JC:-14JD:20J答案:–24J1.Thetheoremofkineticenergyofaparticlefollowsthattheamountofworkdoneisindependentofthepath.（）A:对B:错答案:错2.Theworkdonebythenetforceonabodyisequaltotheamountthatthekineticenergyofthebodyincreases.（）A:错B:对答案:对3.Abulletofmassm=10gandv=200m/sspeedwasshotintothewoodblock.Theaverageresistanceofwoodblocksis5000N.Thenthedepthofbulletentryis（）.A:0.4mB:0.04mC:0.4mD:0.02m答案:0.04m第五章测试4.Foranisolatedsystem,thetotalmomentumofthesystemisconservedwhenthevectorsumoftheexternalforcesiszero.（）A:对B:错答案:对
1.Anobjectwithamassof15kgisplacedonthebottomplateofacrane.Ifthebottomplateofthecraneacceleratesupandtheaccelerationis.Given,theimpulseoftheobjectgivenbythebottomplateofthecranewithin2secondsis（）.A:360kgm/sB:400kgm/sC:300kgm/sD:180kgm/s答案:360kgm/s2.whentheimpulseisconstant,thelongertheactiontime,thesmallertheimpulse.（）A:对B:错答案:对3.Anobjectwithamassof2kgisthrownupwardatthespeedof10m/swithaninclinationangleof30º,themagnitudeofimpulsereceivedbytheobjectwhenitmovestothehighestpointis（）.A:20kgm/sB:36kgm/sC:10kgm/sD:30kgm/s答案:10kgm/s4.Astaticobjectburstintothreepieces,twoofwhichhavethesamemass,andthesamespeedof20m/swiththedirectionofperpendiculartoeachother.Themassofthethirdpieceisexactlyequaltothesumoftheothertwopieces,thenthespeedofthethirdpieceis（）.A:B:C:D:答案:
第六章测试1.Oscillationcanoccuronlywhenthereisarestoringforcetendingtoreturnthesystemtoequilibrium.（）A:错B:对答案:对2.Insimpleharmonicmotiontheperiodandfrequencydonotdependontheamplitude.（）A:对B:错答案:对3.SetTastheperiod,asthefrequency
andastheangularfrequency.Whichofthefollowingexpressionisincorrect（）?A:B:C:
D:答案:
1.Ablockattachedtoahangingidealspringoscillatesupanddownwithaperiodof10sonearth.IfyoutaketheblockandspringtoMars,wheretheaccelerationduetogravityisonlyabout40%aslargeasonearth,whatwillbethenewperiodofoscillation?（）A:lessthan10s.B:notenoughinformationgiventodecide.C:morethan10s;D:10s;答案:10s;2.Insimpleharmonicmotion,theaccelerationaisgenerallyexpressedas（）.A:B:C:
D:答案:
第七章测试1.Youarestandingontheshoreofalake.Youspotatastyfishswimmingsomedistancebelowthelakesurface.Ifyouwanttospearthefish,shouldyouaimthespear（）.A:directlyattheapparentpositionofthefishB:belowtheapparentpositionofthefishC:overtheapparentpositionofthefishD:Notenoughinformation答案:belowtheapparentpositionofthefish2.Youarestandingontheshoreofalake.Youspotatastyfishswimmingsomedistancebelowthelakesurface.Ifinsteadyouuseahigh-powerlasertosimultaneouslykillandcookthefish,shouldyouaimthelaser（）.A:directlyattheapparentpositionofthefishB:NotenoughinformationC:belowtheapparentpositionofthefish,D:overtheapparentpositionofthefish,答案:directlyattheapparentpositionofthefish3.Theangleofreflectionisequaltotheangleofincidenceforallwavelengthsandforanypairofmaterials.（）A:错B:对答案:对4.Theindexofrefractiondependsnotonlyonthesubstancebutalsoonthewavelengthofthelight.（）A:对B:错答案:对
1.thefrequencyofthewavedoesnotchangewhenpassingfromonematerialtoanother.（）A:对B:错答案:对第八章测试2.Thedirectionofpolarizationofanelectromagneticwaveisdefinedtobethedirectionofthemagnetic-fieldvector.（）A:对B:错答案:错3.whentheangleofincidenceisequaltothepolarizingangle(Brewster’sangle)thereflectedrayandtherefractedrayareperpendiculartoeachother.（）A:错B:对答案:对
1.Theunpolarizedlightwithintensityofisincidentontwoparallelidealpolarizers,iftheanglebetweentheaxesofthetwofiltersis60º,theintensitiestransmittedthroughthesecondpolarizeris（）.A:B:
C:0D:答案:
1.Malus’slawisexpressedas:（）A:B:C:D:
答案:
1.WhatistheBrewsteranglewhenlightisincidentfromglass()ontothesurfaceofair()？（）A:57ºB:60ºC:33ºD:30º答案:33º第九章测试2.Theredlightwiththewavelengthof700nmisincidentonthedoubleslitswiththespacingdof0.022cm,andinterferencefringesareformedonthescreenwiththedistanceDof180cm.Whatisthepositionofthesecondorderbrightfringefromthecentralbrightfringe?（）
A:11.46mmB:11mmC:4.09mmD:10mm答案:11.46mm1.Thegreenlightwiththewavelengthof500nmisincidentonthedoubleslitswiththespacingdof0.022cm,andinterferencefringesareformedonthescreenwiththedistanceDof180cm.Whatisthespacingbetweentwosuccessivebrightfringes（）.A:3.08mmB:5.0mmC:4.0mmD:4.09mm答案:4.09mm2.Therefractiveindexofsoapfilmintheairis1.33andthethicknessis0.4μm.Ifwhitelight(400~760nm)isincidentnormally,whatcolormaythesoapfilmshow?（）A:blueB:redC:yellowD:green答案:red3.Whatisthethicknessdifferencebetweentheadjacentbrightinterferencefringesinthethin-filminterferenceofatransparentwedge?（）A:B:
C:D:
答案:1.Naturallightisincidentnormallyona380nmthicksoapfilmintheair.Iftherefractiveindexofthesoapfilmis1.33,whichwavelengthsoflightisconstructivelyinterferedonthefrontsideofthesoapfilm?（）A:674nmB:657nmC:600nmD:601nm答案:674nm第十章测试
1.Ifawaveencountersabarrierthathasanopeningofdimensionssimilartothewavelength,thepartofthewavethatpassesthroughtheopeningwilldiffractintotheregionbeyondthebarrier.（）A:对B:错答案:对2.Near-fielddiffractionorFresneldiffractiondescribesthesituationinwhichboththepointsourceandthescreenarerelativelyclosetotheobstacleformingthediffractionpattern.（）A:对B:错答案:对3.Whichofthefollowingsingleslitdiffractionexperimentshasthesmallestsizeoftheanglefromthecenterofthediffractionpatterntothefirstdarkfringe?（）A:wavelength400nm,slitwidth0.20mm;B:wavelength400nm,slitwidth0.30mm;C:wavelength600nm,slitwidth0.20mm;D:wavelength600nm,slitwidth0.40mm.答案:wavelength400nm,slitwidth0.30mm;4.Inthesingle-slitdiffractionpattern,asthewavelengthoftheincidentlightincreases,thecentralmaximumwill（）.A:thewidthofthecentralmaximumwilldecreaseB:thewidthofthecentralmaximumwillnotchangeC:thecentralmaximumwillbecomeredD:thewidthofthecentralmaximumwillincrease答案:thewidthofthecentralmaximumwilldecrease5.Inadiffractiongratingthathas400slitspermillimeter,theincidentlightisthesodiumspectrumatawavelengthof589nm,whatisthemaximumorderthatcanbeobservedwhenthelightisincidentnormally?（）
A:3B:1C:2D:4答案:4
