CollegePhysics知到智慧樹期末考試答案題庫2025年中國礦業(yè)大學(xué)Yourundueeastwithaconstantspeed3m/sfor10s,andthenrunduesouthwithaconstantspeed2m/sfor20s.Whatisthemagnitudeofaveragevelocity.（）

答案:5/3m/sYourundueeastwithaconstantspeed3m/sfor10s,andthenrunduewestwithaconstantspeed2m/sfor5s.Whatistheaveragespeed.（）

答案:8/3m/sWhichofthefollowingunitconversionsarecorrect.（）

答案:Whichofthefollowingsubjectsareincludedintheclassicalphysics.（）

答案:Mechanics###Thermodynamics###Electromagnetics###OpticsWhichofthefollowingstatementsaboutthetorquearecorrect.（）

答案:Aforcecancontributezerotorque###Thetorqueisproportionaltoboththeforceanditsleverarm###ThetorqueofaforceisdifferentfordifferentrotationalaxisWhichofthefollowingstatementsaboutthenon-conservativeforcearecorrect.（）

答案:Thelostkineticenergycausedanon-conservativeforcebycannotberecovered###Theworkdonebyanonconservativeforcedependsontheactualpath###Kineticfrictionandfluidresistancearenon-conservativeforce###Non-conservativeforceisalsocalleddissipativeforceWhichofthefollowingstatementsaboutthefrictionforcearecorrect.（）

答案:Frictioncanbedividedintostaticfrictionandkineticfriction###FrictionisalwaysperpendiculartothenormalforceWhichofthefollowingstatementsabouttheforcearecorrect.（）

答案:Aforcecanbeapullorapush###Aforcemaybeaninteractionbetweentwoobjects###TheforceisavectorquantityWhichofthefollowingstatementsaboutrotationalinertiaarecorrect.（）

答案:Therotationalinertiacanbedifferentfordifferentaxis###Theminimumrotationalinertiaappearsastheaxisthroughthecenterofmass###TheparallelaxistheoremcanbeusedtocalculaterotationalinertiaWhichofthefollowingstatementsaboutphysicsarecorrect.（）

答案:Physicsexistseverywhereandeveryday###Physicsconcernsthephenomenafromcosmosdowntoatoms###Physicsisthenaturalscience###PhysicsisoneofthemostfundamentalscientificdisciplinesWhichofthefollowingstatementsaboutdisplacementanddistancearecorrect.（）

答案:Thedisplacementisdirectedfromtheinitialpositiontofinalposition###Thedisplacementisreversedastheinitialandfinalpositionsexchanged###Thedisplacementisnotalongthemotionpath###ThedisplacementisalwaysparalleltoaveragevelocityWhichofthefollowingphysicsquantitiescanbedirectlymeasured.（）

答案:time###length###weightWhichofthefollowingobjectscanbetakenasaninertialframeofreference.（）

答案:Acarthatisatrest###AcarthatmoveswithaconstantvelocityWhichofthefollowingforcesareconservativeforces.（）

答案:gravity###elasticspringforceWhichofthefollowingequationsaboutvectoroperationsarecorrect.（）

答案:Whenonlyconservativeforcesdowork,thetotalmechanicalenergyisconserved.（）

答案:對Whatisthecosmicscaleinnature.（）

答案:Whatistheatomicscaleinnature.（）

答案:Vectoroperationsaredifferentfromscalaroperations.Whichofthefollowingequationsiswrong.（）

答案:Threeparticlesofmass1kg,2kg,and3kglocateatthreecornersofanequilateraltriangle(sidelength3m).Iftheaxisperpendiculartothetriangleandthroughthecenter,whatistherotationalinertia.（）

答案:Thetorqueonparticleisduetothenetforceonthatparticle,includingbothinternalandexternalforces.（）

答案:對TheNewton(N)istheSIderivedunitofforce,andtheunitconversionof1Nis（）.

答案:Themechanicscanbedividedintodynamicsandkinematic,anddynamicsdescribestherelationshipbetweenmotionandforce.（）

答案:對Themagnitudeofthecrossproductoftwovectorsisalwayslargerthandotproductofthem.（）

答案:錯Themagnitudeofaveragevelocitymaynotequaltoaveragespeed,butthemagnitudeofinstantaneousvelocitymustequaltoinstantaneousspeed.（）

答案:對Thekineticenergyofaparticleisequaltothetotalworkthatwasdonetoaccelerateitfromresttoitspresentspeed.（）

答案:對TheJoule(J)istheSIderivedunitofenergy,andtheunitconversionof1Jis（）.

答案:Theequationofoscillationscanonlybeexpressedastrigonometricfunctions.（）

答案:錯ThecommonlyusedunitforenergyisJoule,andanyotherunitofenergycanbeconvertedintoJoule.（）

答案:對Relativitytheoryandquantummechanicsarethefundamentalsofmodernphysics.（）

答案:對Newton’slawscanbeappliedtobothinertialandnon-inertialframes.（）

答案:錯Inwhichofthefollowingsituations,themechanicalenergyisconserved.（）

答案:onlyconservativeforcesdothework###projectilemotion###ablockfreelyfallingandcompressingaspringInwhichofthefollowingprocesses,thelinearmomentumofthesystemisconserved.（）

答案:twoblockscollideonasmoothsurface###fireabullet###explosion###amanwalkingonavehiclethatisrestonsmoothsurfaceInwhichofthefollowingmotions,theworkbythenetforceiszero.（）

答案:motionwithconstantvelocity###uniformcircularmotionInwhichofthefollowingmotions,themagnitudeofdisplacementmustequaltothedistance（）

答案:motionwithconstantvelocityInuniformcircularmotion,theaccelerationisalwaysperpendiculartothevelocity.（）

答案:對InNewtonianmechanics,notallquantitiesareindependent,whatarethethreebasequantities.（）

答案:length,mass,timeInlinearmotions,themagnitudeofdisplacementalwaysequalstothedistance.（）

答案:錯Inlinearmotions,ifthedisplacementincreaseswithtime,thevelocitymustincrease.（）

答案:錯Inlinearmotion,ifthevelocitydoesnotchangeitsdirection,themagnitudeofdisplacementwillbeequaltothedistance.（）

答案:對Inlinearmotion,iftheaccelerationisoppositetotheinitialvelocity,whichofthefollowingstatementsarecorrect.（）

答案:Thevelocityataparticulartimecanbezero###Theaveragevelocityforaparticulartimeintervalcanbezero###ThedisplacementforaparticulartimeintervalcanbezeroInlinearmotionofconstantacceleration,whichofthefollowingstatementsaboutthedisplacement-timecurvearecorrect.（）

答案:Thecurveisaparabolaandcurveupward###Thecurveisaparabolaandcurvedownward###ThederivativeofthecurvegivesthevelocityInfreelyfallingmotion,twoobjectswithdifferentmasshavethesameacceleration.（）

答案:對Inelasticcollisions,whichofthefollowingphysicsquantitiesareconserved.（）

答案:momentumofthesystem###kineticenergyofthesystemInelasticcollision,whichofthefollowingphysicsquantitiesareconserved.（）

答案:momentumofthesystem###kineticenergyofthesystemIftwovectorsareperpendicular,theirdotproductiszeroandtheircrossproducthasthemaximummagnitude.（）

答案:對Ifthevectorsumoftheexternalandinternalforcesonasystemiszero,thetotalmomentumofthesystemisconserved.（）

答案:錯Ifthemomentumisconservedforasystem,whichofthefollowingstatementsarecorrect.（）

答案:zeroexternalforceactingonthesystem###internalforcesoneachotherformingaction-reactionpairsIfnon-conservativeforcesdothework,bothmechanicalenergyandtotalenergyarenotconserved.（）

答案:錯IfcarAismovingfasterthancarB,thenetforceoncarAmustbelargerthanthatoncarB.（）

答案:錯Ifavectorismultipliedbyascalar,itsdirectiondoesnotchange.（）

答案:對Ifafleacanjumpstraightuptoaheightofh,whatisitsinitialspeedasitleavestheground.（）

答案:Fourparticleswiththesamemassof2kglocateatfourcornersofasquare.Ifthesidelengthofthesquareis2manditscenterisattheorigin,whatisthecenterofmassofthesystem.（）

答案:Fourparticlesofmass1kg,2kg,3kg,and4kglocateatthefourcornersofasquare(sidelength4m).Iftheaxisperpendiculartothesquareandthroughthe1-kgparticle,whatisthemomentumofinertia.（）

答案:Fourparticlesofmass1kg,2kg,3kg,and4kglocateatthefourcornersofasquare(sidelength4m).Ifrotationalaxisperpendiculartothesquareandthroughitscenter,whatisthemomentumofinertia.（）

答案:Forsimpleharmonicmotioninxdirection,whichofthefollowingstatementsarecorrect.（）

答案:Forconservationofmomentum,theinternalforcescanonlybeconservativeforces.（）

答案:錯Forarotation,thedirectionofangularvelocityisparalleltothedirectionofrotation.（）

答案:錯Bothdistanceandspeedofamotioncanbemeasureddirectly.（）

答案:錯Anyparticlefollowingacurvedpathisaccelerating.（）

答案:對Anoscillatortakes10sfor5revolutions.Whatistheangularfrequencyofthisoscillation.（）

答案:AccordingtoNewton’sthirdlaw,whichofthefollowingstatementsaboutaction-reactionforcepairsarecorrect.（）

答案:Theymustactontwodifferentobjects###TheyhavethesamemagnitudebutoppositedirectionAccordingtoNewton’sfirstlaw,inwhichofthefollowingmotions,thenetforceactingontheparticleiszero.（）。

答案:Theparticleisatrest###TheparticlemoveswithaconstantvelocityAccordingtoNewton’sfirstlaw,ifaparticlemoveswithaconstantspeed,thenetforceactingonitmustbezero.（）

答案:錯AuniformdiskofmassMandradiusR,whatistherotationalinertialastheaxisperpendiculartothediskandpassingthroughitsedge.（）

答案:Aphysicalquantityhasbothmagnitudeanddirection,soitmustbeavectorquantity.（）

答案:錯Aparticleundergoesauniformcircularmotion.Whichofthefollowingstatementsarecorrect.（）。

答案:Themagnitudeofvelocityequalstothespeed###ThetangentialcomponentofaccelerationiszeroAparticlemoveswithaconstantaccelerationfromrestalongxaxis,fromx=0mtox=10min5s.Whatistheacceleration.（）

答案:AparticlemovesfrompointAtopointBalongdifferentpaths,whichofthefollowingphysicalquantitiesareconserved.（）

答案:displacementAparticlemovesalongxaxis,fromx=0mtox=10mandthenbacktox=5m.Whatarethedisplacementsanddistancedofthemotion（）

答案:s=5m,d=15mAjugglerthrowsabowlingpinupwithaninitialspeedof14.7m/s.Whatisthepositionofthejuggleraboveitsinitialpositionast=2s.（）

答案:9.8mAjugglerthrowsabowlingpinupwithaninitialspeedof14.7m/s.Howmuchtimeelapsesuntilthebowlingpinreturnstothehandofjuggler.（）

答案:3.0sAcubicofsidelength1cmandmass10gram.Themassdensityinstandardunitsis（）。

答案:Acartravelsinthe+xdirection.Itacceleratesfromrestto200m/sin10s,andthentravelswith200m/sforanother10s.Whatisthemagnitudeofaverageacceleration.（）

答案:Acartravelsalongxaxiswithaconstantacceleration.Ifittravelsin10s,withthespeedfrom20m/sinthe-xdirectionandto40m/sinthe+xdirection,whatisthedisplacement.（）

答案:100mAcarmoveswithaspeed72kilometersperhour.Thespeedinstandardunitsis（）。

答案:20meterspersecondAcaracceleratesinthe-x