College Physics智慧树知到课后章节答案2023年下中国矿业大学

CollegePhysics智慧树知到课后章节答案2023年下中国矿业大学中国矿业大学

第一章测试

Whatistheatomicscaleinnature.（）

A:mB:mC:mD:m

答案:m

Whatisthecosmicscaleinnature.（）

A:mB:mC:mD:m

答案:m

Whichofthefollowingstatementsaboutphysicsarecorrect.（）

A:PhysicsisoneofthemostfundamentalscientificdisciplinesB:PhysicsconcernsthephenomenafromcosmosdowntoatomsC:PhysicsisthenaturalscienceD:Physicsexistseverywhereandeveryday

答案:Physicsisoneofthemostfundamentalscientificdisciplines;Physicsconcernsthephenomenafromcosmosdowntoatoms;Physicsisthenaturalscience;Physicsexistseverywhereandeveryday

Whichofthefollowingsubjectsareincludedintheclassicalphysics.（）

A:OpticsB:ThermodynamicsC:MechanicsD:Electromagnetics

答案:Optics;Thermodynamics;Mechanics;Electromagnetics

Relativitytheoryandquantummechanicsarethefundamentalsofmodernphysics.（）

A:错B:对

答案:对

第二章测试

Abottleofwateris500ml,instandardunits,whichis（）

A:0.05B:0.005C:0.5D:0.0005

答案:0.0005

Avectorwithamagnitude10andangleto+yaxis,whichcanbewrittendownas（）。

A:B:C:D:

答案:

Whichofthefollowingphysicsquantitiescanbedirectlymeasured.（）

A:timeB:weightC:lengthD:speed

答案:time;weight;length

Whichofthefollowingequationsaboutvectoroperationsarecorrect.（）

A:B:C:D:

答案:;;;

Iftwovectorsareperpendicular,theirdotproductiszeroandtheircrossproducthasthemaximummagnitude.（）

A:错B:对

答案:对

第三章测试

Aparticlemovesalongxaxis,fromx=0mtox=10mandthenbacktox=5m.Whatarethedisplacementsanddistancedofthemotion（）

A:B:C:D:

答案:

Aparticlemoveswithaconstantaccelerationfromrestalongxaxis,fromx=0mtox=10min5s.Whatistheacceleration.（）

A:B:C:D:

答案:

Inlinearmotion,iftheaccelerationisoppositetotheinitialvelocity,whichofthefollowingstatementsarecorrect.（）

A:TheaveragevelocityforaparticulartimeintervalcanbezeroB:ThevelocityataparticulartimecanbezeroC:ThedisplacementforaparticulartimeintervalcanbezeroD:Thedistanceforaparticulartimecanbezero

答案:Theaveragevelocityforaparticulartimeintervalcanbezero;Thevelocityataparticulartimecanbezero;Thedisplacementforaparticulartimeintervalcanbezero

Themotionequationofaparticleis.At,whichofthefollowingresultsarecorrect.（）。

A:accelerationB:velocityC:accelerationD:velocity

答案:acceleration;velocity

Inlinearmotion,ifthevelocitydoesnotchangeitsdirection,themagnitudeofdisplacementwillbeequaltothedistance.（）

A:错B:对

答案:对

第四章测试

Aparticlemovesfromthepositionmtomin2s.Whatistheaveragevelocityofthismotion（）。

A:m/sB:m/sC:m/sD:m/s

答案:m/s

Aparticlemoveswithaconstantacceleration.Ifitsinitialvelocityism/s,whatisthevelocityoftheparticleatt=2s.（）

A:m/sB:m/sC:m/sD:m/s

答案:m/s

Foratwo-dimensionalvelocity,thechangeofvelocitymayhappenas（）。

A:changeofB:changeofC:changeoftheanglebetweenandD:changeofbothand

答案:changeof;changeof;changeoftheanglebetweenand;changeofbothand

Aparticleundergoesauniformcircularmotion.Whichofthefollowingstatementsarecorrect.（）。

A:TheradialcomponentofaccelerationiszeroB:ThemagnitudeofvelocityequalstothespeedC:ThemagnitudeofdisplacementequalstothedistanceforanytimeintervalD:Thetangentialcomponentofaccelerationiszero

答案:Themagnitudeofvelocityequalstothespeed;Thetangentialcomponentofaccelerationiszero

Foraprojectilemotionfromtheground,themaximumlateraldistancecanbeachievedasthelaunchingangleis.（）

A:对B:错

答案:对

第五章测试

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:TheparticlemoveswithaconstantspeedB:TheparticlemoveswithaconstantaccelerationC:TheparticlemoveswithaconstantvelocityD:Theparticleisatrest

答案:Theparticlemoveswithaconstantvelocity;Theparticleisatrest

AccordingtoNewton’sthirdlaw,whichofthefollowingstatementsaboutaction-reactionforcepairsarecorrect.（）

A:TheyhavethesamemagnitudeandsamedirectionB:TheymustactontwodifferentobjectsC:TheycanactonthesameobjectD:Theyhavethesamemagnitudebutoppositedirection

答案:Theymustactontwodifferentobjects;Theyhavethesamemagnitudebutoppositedirection

Newton’slawscanbeappliedtobothinertialandnon-inertialframes.（）

A:对B:错

答案:错

第六章测试

A2-kgparticlemovesfromvelocityto.Whatistheworkdonebythenetforce.（）

A:22JB:16JC:12JD:36J

答案:12J

A2-kgparticleisprojectedfromatableofheight3m,withaspeed5m/s.Whatisthemechanicalenergyoftheparticleasitdropsdowntotheheight2m.（）

A:33.8JB:44.6JC:64.2JD:83.8J

答案:83.8J

Inwhichofthefollowingmotions,theworkbythenetforceiszero.（）

A:freelyfallingmotionB:uniformcircularmotionC:motionwithconstantvelocityD:motionwithconstantacceleration

答案:uniformcircularmotion;motionwithconstantvelocity

Inwhichofthefollowingsituations,themechanicalenergyisconserved.（）

A:ablockmovingonaroughsurfaceB:onlyconservativeforcesdotheworkC:projectilemotionD:ablockfreelyfallingandcompressingaspring

答案:onlyconservativeforcesdothework;projectilemotion;ablockfreelyfallingandcompressingaspring

Ifnon-conservativeforcesdothework,bothmechanicalenergyandtotalenergyarenotconserved.（）

A:对B:错

答案:错

第七章测试

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:momentumofeachparticleB:kineticenergyofthesystemC:momentumofthesystemD:kineticenergyofeachparticle

答案:kineticenergyofthesystem;momentumofthesystem

Ifthemomentumisconservedforasystem,whichofthefollowingstatementsarecorrect.（）

A:zeroforceactingoneachparticleB:zeroexternalforceactingonthesystemC:internalforcesoneachotherformingaction-reactionpairsD:nointernalforcesinthesystem

答案:zeroexternalforceactingonthesystem;internalforcesoneachotherformingaction-reactionpairs

Forconservationofmomentum,theinternalforcescanonlybeconservativeforces.（）

A:对B:错

答案:错

第八章测试

AuniformdiskofmassMandradiusR,whatistherotationalinertialastheaxisperpendiculartothediskandpassingthroughitsedge.（）

A:B:C:D:

答案:

AuniformrodofmassMandlengthLrotateswithanangularspeed.Iftheaxispassingthroughitsoneend,whatistheangularmomentum.（）

A:B:C:D:

答案:

Aparticleofmassrotateswithanangularspeed，andadistancetotherotationalaxis.Whichofthefollowingequationsarecorrect.（）

A:angularmomentumoftheparticleB:radialaccelerationC:kineticenergyoftheparticleD:linearspeedoftheparticle

答案:angularmomentumoftheparticle;kineticenergyoftheparticle;linearspeedoftheparticle

Whichofthefollowingstatementsaboutrotationalinertiaarecorrect.（）

A:TheminimumrotationalinertiaappearsastheaxisthroughthecenterofmassB:TheobjectwithlargermassmusthavelargerrotationalinertiaC:TheparallelaxistheoremcanbeusedtocalculaterotationalinertiaD:Therotationalinertiacanbedifferentfordifferentaxis

答案:Theminimumrotationalinertiaappearsastheaxisthroughthecenterofmass;Theparallelaxistheoremcanbeusedtocalculaterotationalinertia;Therotationalinertiacanbedifferentfordifferentaxis

Thetorqueonparticleisduetothenetforceonthatparticle,includingbothinternalandexternalforces.（）

A:错B:对

答案:对

第九章测试

Anoscillatortakes10sfor5revolutions.Whatistheangularfrequencyofthisoscillation.（）

A:B:C:D:

答案:

Inspring-blocksystem(springconstantandmass),whatisthefrequencyf