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首页 The nature test of the electric field force and …

The nature test of the electric field force and the full analytic answer -32 are followed by the physics round of the college entrance exam in 2015.doc

The nature test of the electric…

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2018-04-30 0人阅读 举报 0 0 暂无简介

简介:本文档为《The nature test of the electric field force and the full analytic answer -32 are followed by the physics round of the college entrance exam in 2015doc》,可适用于社会民生领域

ThenaturetestoftheelectricfieldforceandthefullanalyticanswerarefollowedbythephysicsroundofthecollegeentranceexaminThenaturetestoftheelectricfieldforceandthefullanalyticanswerarefollowedbythephysicsroundofthecollegeentranceexaminZhangpeistudyplanningsystem,sharedailyUsemetalfoiltomakeanunchargedringandplaceitonadryinsulatedtableXiaoMingclassmatemadeofinsulatingmaterialthecapandthehairafterfriction,willthecapslowlyclosetothering,downwardsoncmringweredrawntothecapon,asshowninfigure,judgmentandanalysisoftheabovephenomenon,thefollowingistrue(),onthering,,,wereallatoncethecapwiththechargeneutralizationAsshownhere,thetwopositivechargesofQandQareplacedatpointAandB,respectivelyInLsmoothforthediameteroftheinsulationonthehalfcircle,wearingAchargedballq(asApointcharge),atpointPbalance,PAwithanAngleofalphaAB,regardlessofthesmallballofgravity,()==<QresolutiontochooseATheballisinastateofequilibriumwiththreeforcesatP,FNandFN,whichisperpendiculartotheFBIt'sthecoulomb'slaw:youknow,thetangentofalphaisequaltothesolution,soAiswrongforBSoweknowthattheFA>FB,r,>r,soQ>Q,sothefieldintensityofOisnotzero,soCandDarebothwrongAsshowninthepicture,thetwoballs,bothofwhichhaveAplusqandAminusq,aresuspendedbyAthinwire,andthecoulombgravityislessthantheball'sgravityNowaddalevelandstrongelectricfieldtotheright,againforthetwoballstokeepstaticstate,thefollowingconclusioniscorrect(),,,,thetensionofABisbiggerthanwithouttheelectricfieldresolutionchooseC,DFirst,theoverallbalanceanalysisofABisappliedtotheoverallmethod,thetensionofthesuspensionlineistwomg,andtheOAisintheverticaldirection,andthechoiceCiscorrectWithBastheresearchobjectandthenusingthemethodofisolationanalysis,partialsuspensionlineABtoleft,thetensionfortheelectricfieldforceandcoulombforceandtheforceofgravity,iswithouttheelectricfield,optionDcorrect,sotheanswerforCandDUsetheholisticapproachandtheseparationmethodtoanalyzethebalanceproblem()asawhole,sothattheforcebetweenthispartbecomesinternalIfyouthinkofAandBasAwhole,thecoulombforceandtheelasticforcebetweenthemareinternalforces,soyoucanquicklyjudgethedeflectionofthefinelineOA()toanalyzetheeffectofanobjectistoadoptanisolationmethodForexample,toanalyzethedeflectionoffinelineAB,selectBorAtosolvetheequation()thesystembalanceproblemcanbesolvedbythesamemethodifthedirectionoftheelectricfieldistiltedupordown【解析】()由小球运动到最高点可知小球带正电(分)()设小球运动到最高点时速度为v对该过程由动能定理有(qEmg)L=(分)在最高点对小球由牛顿第二定律得(分)由式解得FT=N(分)()小球在细线断裂后在竖直方向的加速度设为a则(分)设小球在水平方向运动L的过程中历时t则L=vt(分)设竖直方向上的位移为x则(分)由解得x=m(分)所以小球距O点高度为xL=m(分)答案:()正电()N()mThefollowingthreepoints:()AandB,whenthetworingsarefalling,cananalyzetheforcesituationandthemotionpicture()tocorrectlyanalyzetherelationshipbetweenthelinearvelocityofthetwoloopsinthesemicircle()thetotalappliedkineticenergytheoremisappliedtothevelocityresolution()forAandBringasAwholebyNewton'ssecondlaw:ma,mgqE=()A=solution()isolationBringandArodforBringdown,thepowerofthesizeofF,havemgF=maqE,()theacquiredF=()()Aringwhenyouarriveatthelowestpoint,triangleOABisanequilateraltriangle,asshownAandBintheprocessofthesystemofcenterofgravitydown(points)inthisposition,AandBalongthedirectionatthesamespeed,sohavevAcosalpha=vBcosbeta,fromthegeometricknowledgeknowablealphabeta==,SothevA=vB(points)accordingtothekineticenergytheoremMGHRqEqER=mv()solutionto()answer:()()Asshowninfigure,twosmallspheresofchargewithaqareconnectedbyalightstringoflightinsulationwithlongl,restingonasmoothinsulatingsurfaceStudent:theradiusrofthetwoballsLKistheelectrostaticconstantThelightropetensionsizeis()aBparsing】【lightropetensionsizeisequaltothecoulombicforcebetweentwochargedballs,F=bycoulomb'slaw,optionBiscorrect,(simulationofhongkoudistrict)asshowninfigure,pointchargeQandQrespectivelyfixedinAandBtwopoints,twopointsCandDtomatchtheABtrisection,nowmakeAnegativelychargedparticlefromCpointtoAcertaininitialvelocitymovementtotheright,regardlessoftheparticle'sgravity,thentheparticlemotionvelocityvbetweenCDandtherelationshipbetweentimetimagesmaybeinfigure(figure)figuretoparsechooseBCparticlesintheABbalanceinthemiddleofthelineisthelocationofthefieldstrengthiszero,so==x,namely,atpointDparticlesinDpointontheleftsideoftheleftintheelectricfieldforce,particlesinpointDontherightsidetotherightintheelectricfieldforceSotherearethreethingsthathappeninthemotionoftheparticle:slowdowntozeroattheleftofDandthenacceleratetotheleftWhentheparticlecancrosstheDpoint,it'sgoingtoslowdownonthelefthandsideofD,andthenaccelerateafterDOrattheleftoftheD,themotiontoDiszero,andthenitisstill,sothemotionoftheparticlebetweentheCDcanbedescribedbyBandC,soBCiscorrect,(asshowninfigure)smooththinrodwithinsulationlevelintoAfixedAngleoftheta,polepositionispositivelychargedball,qualityasthem,chargeforq,tomaketheballstationaryonthepole,canaddAstrongelectricfieldandappliedelectricfieldstrengthtomeetwhatcondition,theballcanremainstillonrod()aperpendiculartotheinclinedupward,fieldsizeofbverticalupward,fieldsizeforcperpendiculartotheinclinedupward,fieldsizefordlevel,totherightfieldsizetofigureresolutionchooseBiftheappliedfieldstrengthofelectricfieldisperpendiculartotheinclinedupward,theballbearinganalysisshowsthatithadbeenhitbyaverticaldownwardgravity,perpendiculartotheinclinedupwardintheelectricfieldforceandverticaltothedirectionoftherodsupport,inundertheactionofthethreeforces,directionalongthebarcouldnotbalance,optionACerrorIftheappliedelectricfieldstrengthoftheverticalupward,theballbearinganalysisshowsthatwhenE=bigreverse,likeelectricfieldforceandgravityballcanremainstillonpole,optionBcorrectSoiftheelectricfieldisgoingtobeequaltotheforceofthefieldforceEq=mgtantheta,theballisinequilibrium,E=,soDerrorIfAandBarechargedbythesamecharge,theballisaffectedbycoulombrepulsion,whichmustbemadetoincreasethecurvemotionofthereducedaccelerationIfBisnegativelycharged,thenBgoestoahigherpositionIfAandBhaveAdifferentcharge,theballofBcoulddoAuniformcircularmotionaroundAball,whichisAcurvethatdoesthesamethingasthevelocityandthemagnitudeoftheacceleration,andthat'stherightchoiceAsshowninfigure,therearefourballsonthehorizontalsurfaceofthesmoothinsulation,withthepowerofq,q,q,andqThefourballsformadiamond,andtheAnglebetweenthelinkofqandqisalphaIfthesystemisinastateofbalance,thecorrectrelationmaybe()Acosalpha=biggestosalphacsinalpha==Dsinalpha=infigureZhangpeilearningplanningsystemisaneffectivewaytoimprovetheacademicperformanceofthesystemCanhelpstudentsinmethod,planContent,learningsolutionintegrationanddistribution,effectivelyimproveacademicperformance

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The nature test of the electric field force and the full analytic answer -32 are followed by the physics round of the college entrance exam in 2015

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