CollegePhysics智慧樹(shù)知到期末考試答案+章節(jié)答案2024年中國(guó)礦業(yè)大學(xué)Themagnitudeofthecrossproductoftwovectorsisalwayslargerthandotproductofthem.（）

答案:錯(cuò)Inuniformcircularmotion,theaccelerationisalwaysperpendiculartothevelocity.（）

答案:對(duì)Themechanicscanbedividedintodynamicsandkinematic,anddynamicsdescribestherelationshipbetweenmotionandforce.（）

答案:對(duì)IfcarAismovingfasterthancarB,thenetforceoncarAmustbelargerthanthatoncarB.（）

答案:錯(cuò)Thekineticenergyofaparticleisequaltothetotalworkthatwasdonetoaccelerateitfromresttoitspresentspeed.（）

答案:對(duì)Inlinearmotions,themagnitudeofdisplacementalwaysequalstothedistance.（）

答案:錯(cuò)Ifthevectorsumoftheexternalandinternalforcesonasystemiszero,thetotalmomentumofthesystemisconserved.（）

答案:錯(cuò)Whenonlyconservativeforcesdowork,thetotalmechanicalenergyisconserved.（）

答案:對(duì)Ifavectorismultipliedbyascalar,itsdirectiondoesnotchange.（）

答案:對(duì)Inlinearmotions,ifthedisplacementincreaseswithtime,thevelocitymustincrease.（）

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答案:Whichofthefollowingunitconversionsarecorrect.（）

答案:Inelasticcollisions,whichofthefollowingphysicsquantitiesareconserved.（）

答案:momentumofthesystem;kineticenergyofthesystemWhichofthefollowingforcesareconservativeforces.（）

答案:elasticspringforce;gravityWhichofthefollowingstatementsaboutdisplacementanddistancearecorrect.（）

答案:Thedisplacementisreversedastheinitialandfinalpositionsexchanged;Thedisplacementisnotalongthemotionpath;Thedisplacementisalwaysparalleltoaveragevelocity;ThedisplacementisdirectedfromtheinitialpositiontofinalpositionWhichofthefollowingobjectscanbetakenasaninertialframeofreference.（）

答案:Acarthatisatrest;AcarthatmoveswithaconstantvelocityInlinearmotionofconstantacceleration,whichofthefollowingstatementsaboutthedisplacement-timecurvearecorrect.（）

答案:Thecurveisaparabolaandcurvedownward;Thederivativeofthecurvegivesthevelocity;Thecurveisaparabolaandcurveupward

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

答案:100m

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答案:Acaracceleratesinthe-xdirectionfromrestto200m/sin10s,andthenacceleratesinthe+xdirectionto200m/sin10s.Whatisthemagnitudeofaverageacceleration.（）

答案:Vectoroperationsaredifferentfromscalaroperations.Whichofthefollowingequationsiswrong.（）

答案:Ajugglerthrowsabowlingpinupwithaninitialspeedof14.7m/s.Whatisthepositionofthejuggleraboveitsinitialpositionast=2s.（）

答案:9.8mInNewtonianmechanics,notallquantitiesareindependent,whatarethethreebasequantities.（）

答案:length,mass,time

答案:0.1m

答案:+300m

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

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答案:Acubicofsidelength1cmandmass10gram.Themassdensityinstandardunitsis（）。

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答案:58.8J

答案:9J

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答案:120m

答案:-25JTheNewton(N)istheSIderivedunitofforce,andtheunitconversionof1Nis（）.

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答案:Ifafleacanjumpstraightuptoaheightofh,whatisitsinitialspeedasitleavestheground.（）

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答案:0J

答案:10J

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答案:Anoscillatortakes10sfor5revolutions.Whatistheangularfrequencyofthisoscillation.（）

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答案:Theequationofoscillationscanonlybeexpressedastrigonometricfunctions.（）

答案:錯(cuò)Forsimpleharmonicmotioninxdirection,whichofthefollowingstatementsarecorrect.（）

答案:Thetorqueonparticleisduetothenetforceonthatparticle,includingbothinternalandexternalforces.（）

答案:對(duì)Whichofthefollowingstatementsaboutrotationalinertiaarecorrect.（）

答案:Theminimumrotationalinertiaappearsastheaxisthroughthecenterofmass;Theparallelaxistheoremcanbeusedtocalculaterotationalinertia;Therotationalinertiacanbedifferentfordifferentaxis

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答案:AuniformdiskofmassMandradiusR,whatistherotationalinertialastheaxisperpendiculartothediskandpassingthroughitsedge.（）

答案:Forconservationofmomentum,theinternalforcescanonlybeconservativeforces.（）

答案:錯(cuò)A2-kgparticlemovesforrestduetoa10-Nnetforce.In5s,whatisfinalmomentoftheparticle.（）

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答案:Ifthemomentumisconservedforasystem,whichofthefollowingstatementsarecorrect.（）

答案:internalforcesoneachotherformingaction-reactionpairs;zeroexternalforceactingonthesystemInelasticcollision,whichofthefollowingphysicsquantitiesareconserved.（）

答案:momentumofthesystem;kineticenergyofthesystemInwhichofthefollowingsituations,themechanicalenergyisconserved.（）

答案:onlyconservativeforcesdothework;projectilemotion;ablockfreelyfallingandcompressingaspringA2-kgparticleisprojectedfromatableofheight3m,withaspeed5m/s.Whatisthemechanicalenergyoftheparticleasitdropsdowntotheheight2m.（）

答案:83.8J

答案:12JIfnon-conservativeforcesdothework,bothmechanicalenergyandtotalenergyarenotconserved.（）

答案:錯(cuò)Inwhichofthefollowingmotions,theworkbythenetforceiszero.（）

答案:uniformcircularmotion;motionwithconstantvelocityAccordingtoNewton’sfirstlaw,inwhichofthefollowingmotions,thenetforceactingontheparticleiszero.（）。

答案:Theparticlemoveswithaconstantvelocity;TheparticleisatrestNewton’slawscanbeappliedtobothinertialandnon-inertialframes.（）

答案:錯(cuò)

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

答案:Theymustactontwodifferentobjects;Theyhavethesamemagnitudebutoppositedirection

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答案:對(duì)Aparticleundergoesauniformcircularmotion.Whichofthefollowingstatementsarecorrect.（）。

答案:Themagnitudeofvelocityequalstothespeed;Thetangentialcomponentofaccelerationiszero

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答案:Inlinearmotion,iftheaccelerationisoppositetotheinitialvelocity,whichofthefollowingstatementsarecorrect.（）

答案:Thevelocityataparticulartimecanbezero;Thedisplacementforaparticulartimeintervalcanbezero;TheaveragevelocityforaparticulartimeintervalcanbezeroAparticlemovesalongxaxis,fromx=0mtox=10mandthenbacktox=5m.Whatarethedisplacementsanddistancedofthemotion（）

答案:s=5m,d=15mInlinearmotion,ifthevelocitydoesnotchangeitsdirection,themagnitudeofdisplacementwillbeequaltothedistance.（）

答案:對(duì)Aparticlemoveswithaconstantaccelerationfromrestalongxaxis,fromx=0mtox=10min5s.Whatistheacceleration.（）

答案:Whichofthefollowingequationsaboutvectoroperationsarecorrect.（）

答案:Iftwovectorsareperpendicular,theirdotpr