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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.()
答案:錯(cuò)
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
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