SAT物理模拟试题

SAT模拟试题(1)1.Anobjectthat’smovingwithconstantspeedtravelsoncearoundacircularpath.Truestatementsaboutthismotionincludewhichofthefollowing?A.ThedisplacementiszeroB.TheaveragespeediszeroC.TheaccelerationiszeroD.NoneoftheaboveA2.Whichofthefollowingmustalwaysbetrue?1.Ifanobject’saccelerationisconstant,thenitmustmoveinastraightline2.Ifanobject’saccelerationiszero,thenitsspeedmustremainconstant3.Ifanobject’sspeedremainsconstant,thenitsaccelerationmustbezero.A.1and2onlyB.1and3onlyC.2onlyD.3onlyE.2and3onlyC4.Africtionlessinclinedplaneoflength20mhasamaximumverticalheightof5m.Ifanobjectofmass2kgisplancedontheplame.Whichofthefollowingbestapproximatesthenetforceitfeels?A.5NB.10NC.15ND.20NE.30NA5.Apersonwhoweighs800Nstepsontoascalethatisonthefloorofanelevatorcar.Iftheelevatoracceleratesupwardatarateof5m/s2,whatwillthescaleread?A.400NB.800NC.1000ND.1200NE.1600ND6.Apersonstandingonahorizontalfloorfeelstwoforces:thedownwardpullofgravityandtheupwardsupportingforcefromthefloor.TheretwoforcesA.haveequalmagnitudesandfromanaction/reactionpairB.haveequalmagnitudesbutdonotfromanaction/reactionpairC.haveunequalmagnitudesandfromanaction/reactionpairD.haveunequalmagnitudesanddonotfromanaction/reactionpairE.NoneoftheaboveB7.Howlongwouldittakeacar,startingfromrestandacceleratinguniformlyinastraightlineat5m/s2,tocoveradistanceof200m?A.9sB10.5sC.12.0sD.15.5sE.20.0sA8.Arockisdroppedoffacliffandstrikesthegroundwithanimpactvelocityof30m/s.Howhighwasthecliff?A.15mB.20mC.30mD.45mE.60mD9.Asoccerballatrestontheground,iskickedwithaninitialvelocityof10m/satalaunchangleof300.Calculateitstotalflighttime,assumingthatairresistanceisnegligible.A.0.5sB.1sC.1.7sD.2sE.4sB10.Ifalloftheforcesactingonanobjectbalancesothatthenetforceiszero,thenA.theobjectmustbeatrestB.theobject’sspeedwilldecreaseC.theobjectwillfollowaparbolictrajectoryD.theobject’sdirectionofmotioncanchange,butitsspeedcannotE.NoneoftheaboveE11.Thecoefficientofstaticfrictionbetweenaboxandarampis0.5.Theramp’sinclineangleis300.Iftheboxisplacedatrestontheramp,boxwillA.acceleratedowntherampB.acceleratebrieflydowntherampbutthenslowdownandstopC.movewithconstantvelocitydowntherampD.notmoveE.CannotbedeterminedfromtheinformationgivenA12.A20Nblockisbeingpushedacrossahorizontaltablebyan18Nforce.Ifthecoefficientofkineticfrictionbetweentheblockandthetableis0.4.findheaccelerationoftheblockA.0.5m/s2B.1m/s2C.5m/s2D.7.5m/s2E.9m/s2C13.Astoneisthrownhorizontallywithaninitialspeedof30m/sfromabridge.Findthestone’stotalspeedwhenitentersthewater4secondslater(Ignoreairresistance.)A.30m/sB.40m/sC.50m/sD.60m/sE.70m/sC14.Whichoneofthefollowingstatementsistrueconcerningthemotionofanidealprojectilelaunchedatanangleof450totheborizontal?A.TheaccelerationvectorpointsoppositetothevelocityvectoronthewayupandinthesamedirectionasthevelocityvectoronthewaydownB.Thespeedatthetopofthetrajectoryiszero.C.Theobject’stotalspeedremainsconstantduringtheentireflightD.ThehorizontalspeeddecreasesonthewayupandincreasesonthewaydownE.TheverticalspeeddecreasesonthewayupandincreasesonthewaydownE15.Whichpairofforcescanproducearesultantof15newtons?A.20N,20NB.25N,5NC.5N,5ND.7N,7NE.5N,3NA16.Twocratesarestackedontopofeachotheronahorizontalfloor,crate#1isonthebottom,andcrate#2isonthetop.Bothcrateshavethesamemass.ComparedwiththestrengthoftheforceF1necessarytopushonlycrate#1ataconstantspeedacrossthefloor,thestrengthoftheforceF2necessarytopushthestackatthesameconstantspeedacrossthefloorisgreaterthanF1becauseA.theforceoftheflooroncrate#1isgreaterB.thecoefficientofkineticfrictionbetweencrate#1andthefloorisgreaterC.theforceofkineticfriction.Butnotthenormalforce,oncrate#1isgreaterD.thecoefficientofstaticfrictionbetweencrate#1andthefloorisgreaterE.theweightofcrate#1isgreaterA17.Acrateofmass100kgisatrestonahorizontalfloor.Thecoefficientofstaticfrictionbetweencrateandtheflooris0.4,landthecoefficientofkineticfrictionis0.3.AforceFofmagnitude344Nisthenappliedtothecrate,paralleltothefloor.Whichofthefollowingistrue?A.Thecratewillaccelerateacrossthefloorat0.5m/s2B.Thestaticfrictionforce,whichisthereactionforcetoFasguaranteedbyNewton’sthirdlaw.willalsohaveamagnitudeof344NC.Thecratewillslideacrossthefloorataconstantspeedof0.5m/sD.ThecratewillnotmoveENoneoftheaboveD18.Ablockofmassmisatrestonafrictionless,horizontaltableplacedinalaboratoryonthesurfaceoftheearth.Anidenticalblockisatrestonafrictionless,horizontaltableplacedonthesurfaceofthemoon.LetFbethenetforcenecessarytogivetheearth-houndblockanaccelerationofaacrossthetable.Giventhatgmoonisonesixthofgearth,theforcenecessarytogivethemoon-boudblockthesameaccelerationaacrossthetableisA.F/12B.F/6C.F/3D.FE.6FD19.Astheanglebetweentwoconcurrentforcesincreases,themagnitudeoftheirresultantA.increasesonlyB.decreasesandthenincreasesC.increasesandthendecreasesD.remainsthesameE.decreasesonlyE20.Agirlwalks2metersnorth,4meterswest,and2meterssouth.HerfinaldisplacementisA.4meastB.4mwestC.2mnorthD.2msouthE.5mnorthwestB21.Acartispulledbyaropemakinganangleof450tothehorizontal.If100newtonsofforceareappliedtotherope,themagnitudeofthehorizontal