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CollegePhysics知到智慧树章节测试课后答案2024年秋中国矿业大学第一章单元测试
Whatistheatomicscaleinnature.()
A:mB:mC:mD:m
答案:mWhatisthecosmicscaleinnature.()
A:mB:mC:mD:m
答案:mWhichofthefollowingstatementsaboutphysicsarecorrect.()
A:PhysicsisoneofthemostfundamentalscientificdisciplinesB:PhysicsisthenaturalscienceC:PhysicsexistseverywhereandeverydayD:Physicsconcernsthephenomenafromcosmosdowntoatoms
答案:Physicsisoneofthemostfundamentalscientificdisciplines;Physicsisthenaturalscience;Physicsexistseverywhereandeveryday;PhysicsconcernsthephenomenafromcosmosdowntoatomsWhichofthefollowingsubjectsareincludedintheclassicalphysics.()
A:MechanicsB:OpticsC:ElectromagneticsD:Thermodynamics
答案:Mechanics;Optics;Electromagnetics;ThermodynamicsRelativitytheoryandquantummechanicsarethefundamentalsofmodernphysics.()
A:对B:错
答案:对
第二章单元测试
Abottleofwateris500ml,instandardunits,whichis()
A:0.005B:0.05C:0.0005D:0.5
答案:0.0005Avectorwithamagnitude10andangleto+yaxis,whichcanbewrittendownas()。
A:B:C:D:
答案:Whichofthefollowingphysicsquantitiescanbedirectlymeasured.()
A:timeB:speedC:lengthD:weight
答案:time;length;weightWhichofthefollowingequationsaboutvectoroperationsarecorrect.()
A:B:C:D:
答案:;;;Iftwovectorsareperpendicular,theirdotproductiszeroandtheircrossproducthasthemaximummagnitude.()
A:对B:错
答案:对
第三章单元测试
Aparticlemovesalongxaxis,fromx=0mtox=10mandthenbacktox=5m.Whatarethedisplacementsanddistancedofthemotion()
A:s=15m,d=15mB:s=5m,d=15mC:s=5m,d=5mD:s=15m,d=5m
答案:s=5m,d=15mAparticlemoveswithaconstantaccelerationfromrestalongxaxis,fromx=0mtox=10min5s.Whatistheacceleration.()
A:B:C:D:
答案:Inlinearmotion,iftheaccelerationisoppositetotheinitialvelocity,whichofthefollowingstatementsarecorrect.()
A:ThedistanceforaparticulartimecanbezeroB:ThedisplacementforaparticulartimeintervalcanbezeroC:ThevelocityataparticulartimecanbezeroD:Theaveragevelocityforaparticulartimeintervalcanbezero
答案:Thedisplacementforaparticulartimeintervalcanbezero;Thevelocityataparticulartimecanbezero;TheaveragevelocityforaparticulartimeintervalcanbezeroThemotionequationofaparticleis.At,whichofthefollowingresultsarecorrect.()。
A:accelerationB:velocityC:velocityD:acceleration
答案:acceleration;velocityInlinearmotion,ifthevelocitydoesnotchangeitsdirection,themagnitudeofdisplacementwillbeequaltothedistance.()
A:错B:对
答案:对
第四章单元测试
Aparticlemovesfromthepositionmtomin2s.Whatistheaveragevelocityofthismotion()。
A:m/sB:m/sC:m/sD:m/s
答案:m/sAparticlemoveswithaconstantacceleration.Ifitsinitialvelocityism/s,whatisthevelocityoftheparticleatt=2s.()
A:m/sB:m/sC:m/sD:m/s
答案:m/sForatwo-dimensionalvelocity,thechangeofvelocitymayhappenas()。
A:changeofbothandB:changeofC:changeofD:changeoftheanglebetweenand
答案:changeofbothand;changeof;changeof;changeoftheanglebetweenandAparticleundergoesauniformcircularmotion.Whichofthefollowingstatementsarecorrect.()。
A:ThetangentialcomponentofaccelerationiszeroB:ThemagnitudeofdisplacementequalstothedistanceforanytimeintervalC:ThemagnitudeofvelocityequalstothespeedD:Theradialcomponentofaccelerationiszero
答案:Thetangentialcomponentofaccelerationiszero;ThemagnitudeofvelocityequalstothespeedForaprojectilemotionfromtheground,themaximumlateraldistancecanbeachievedasthelaunchingangleis.()
A:对B:错
答案:对
第五章单元测试
A2-kgblocksitsonaroughground.Ifpushedbya10Nforce,itwillmovewithanacceleration2.Whatisthecoefficientofkineticfriction.()
A:B:C:D:
答案:Twoparticleswithmassandcanbeacceleratedbyaconstant10-Nforce,Ifnootherforcesandtheratiooftheiraccelerationsare2:1,whatistheratiooftheirmasses.()
A:B:C:D:
答案:AccordingtoNewton’sfirstlaw,inwhichofthefollowingmotions,thenetforceactingontheparticleiszero.()。
A:TheparticleisatrestB:TheparticlemoveswithaconstantvelocityC:TheparticlemoveswithaconstantspeedD:Theparticlemoveswithaconstantacceleration
答案:Theparticleisatrest;TheparticlemoveswithaconstantvelocityAccordingtoNewton’sthirdlaw,whichofthefollowingstatementsaboutaction-reactionforcepairsarecorrect.()
A:TheyhavethesamemagnitudeandsamedirectionB:TheymustactontwodifferentobjectsC:TheyhavethesamemagnitudebutoppositedirectionD:Theycanactonthesameobject
答案:Theymustactontwodifferentobjects;TheyhavethesamemagnitudebutoppositedirectionNewton’slawscanbeappliedtobothinertialandnon-inertialframes.()
A:对B:错
答案:错
第六章单元测试
A2-kgparticlemovesfromvelocityto.Whatistheworkdonebythenetforce.()
A:12JB:22JC:36JD:16J
答案:12JA2-kgparticleisprojectedfromatableofheight3m,withaspeed5m/s.Whatisthemechanicalenergyoftheparticleasitdropsdowntotheheight2m.()
A:64.2JB:33.8JC:44.6JD:83.8J
答案:83.8JInwhichofthefollowingmotions,theworkbythenetforceiszero.()
A:motionwithconstantaccelerationB:freelyfallingmotionC:uniformcircularmotionD:motionwithconstantvelocity
答案:uniformcircularmotion;motionwithconstantvelocityInwhichofthefollowingsituations,themechanicalenergyisconserved.()
A:ablockmovingonaroughsurfaceB:onlyconservativeforcesdotheworkC:ablockfreelyfallingandcompressingaspringD:projectilemotion
答案:onlyconservativeforcesdothework;ablockfreelyfallingandcompressingaspring;projectilemotionIfnon-conservativeforcesdothework,bothmechanicalenergyandtotalenergyarenotconserved.()
A:对B:错
答案:错
第七章单元测试
A2-kgparticlemovesforrestduetoa10-Nnetforce.In5s,whatisfinalmomentoftheparticle.()
A:B:C:D:
答案:A5-kgblockwithavelocitycollideswitha10-kgblockatrest.Ifitisaperfectlyinelasticcollision,whatisthefinalvelocityofthetwoblocks.()
A:B:C:D:
答案:Inelasticcollision,whichofthefollowingphysicsquantitiesareconserved.()
A:kineticenergyofthesystemB:momentumofthesystemC:momentumofeachparticleD:kineticenergyofeachparticle
答案:kineticenergyofthesystem;momentumofthesystemIfthemomentumisconservedforasystem,whichofthefollowingstatementsarecorrect.()
A:zeroforceactingoneachparticleB:internalforcesoneachotherformingaction-reactionpairsC:zeroexternalforceactingonthesystemD:nointernalforcesinthesystem
答案:internalforcesoneachotherformingaction-reactionpairs;zeroexternalforceactingonthesystemForconservationofmomentum,theinternalforcescanonlybeconservativeforces.()
A:错B:对
答案:错
第八章单元测试
AuniformdiskofmassMandradiusR,whatistherotationalinertialastheaxisperpendiculartothediskandpassingthroughitsedge.()
A:B:C:D:
答案:AuniformrodofmassMandlengthLrotateswithanangularspeed.Iftheaxispassingthroughitsoneend,whatistheangularmomentum.()
A:B:C:D:
答案:Aparticleofmassrotateswithanangularspeed,andadistancetotherotationalaxis.Whichofthefollowingequationsarecorrect.()
A:angularmomentumoftheparticleB:kineticenergyoftheparticleC:linearspeedoftheparticleD:radialacceleration
答案:angularmomentumoftheparticle;kineticenergyoftheparticle;linearspeedoftheparticleWhichofthefollowingstatementsaboutrotationalinertiaarecorrect.()
A:TheminimumrotationalinertiaappearsastheaxisthroughthecenterofmassB:TheparallelaxistheoremcanbeusedtocalculaterotationalinertiaC:TheobjectwithlargermassmusthavelargerrotationalinertiaD:Therotationalinertiacanbedifferentfordifferentaxis
答案:Theminimumrotationalinertiaappearsastheaxisthroughthecenterofmass;Theparallelaxistheoremcanbeusedtocalculaterotationalinertia;TherotationalinertiacanbedifferentfordifferentaxisThetorqueonparticleisduetothenetforceonthatparticle,includingbothinternalandexternalforces.()
A:错B:对
答案:对
第九章单元测试
Anoscillatortakes10sfor5revolutions.Whatistheangularfrequencyofthisoscillation.()
A:B:C:D:
答案:Inspring-blocksystem(springconstantandmass),whatisthefr
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