SAT物理模拟试题.docx
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SAT物理模拟试题.docx
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SAT物理模拟试题
SAT模拟试题
(1)
1.Anobjectthat’smovingwithconstantspeedtravelsoncearoundacircularpath.Truestatementsaboutthismotionincludewhichofthefollowing?
A.ThedisplacementiszeroB.Theaveragespeediszero
C.TheaccelerationiszeroD.Noneoftheabove
A
2.Whichofthefollowingmustalwaysbetrue?
1.Ifanobject’saccelerationisconstant,thenitmustmoveinastraightline
2.Ifanobject’saccelerationiszero,thenitsspeedmustremainconstant
3.Ifanobject’sspeedremainsconstant,thenitsaccelerationmustbezero.
A.1and2onlyB.1and3onlyC.2onlyD.3onlyE.2and3only
C
4.Africtionlessinclinedplaneoflength20mhasamaximumverticalheightof5m.Ifanobjectofmass2kgisplancedontheplame.Whichofthefollowingbestapproximatesthenetforceitfeels?
A.5NB.10NC.15ND.20NE.30N
A
5.Apersonwhoweighs800Nstepsontoascalethatisonthefloorofanelevatorcar.Iftheelevatoracceleratesupwardatarateof5m/s
whatwillthescaleread?
A.400NB.800NC.1000ND.1200NE.1600N
D
6.Apersonstandingonahorizontalfloorfeelstwoforces:
thedownwardpullofgravityandtheupwardsupportingforcefromthefloor.Theretwoforces
A.haveequalmagnitudesandfromanaction/reactionpair
B.haveequalmagnitudesbutdonotfromanaction/reactionpair
C.haveunequalmagnitudesandfromanaction/reactionpair
D.haveunequalmagnitudesanddonotfromanaction/reactionpair
E.Noneoftheabove
B
7.Howlongwouldittakeacar,startingfromrestandacceleratinguniformlyinastraightlineat5m/s
tocoveradistanceof200m?
A.9sB10.5sC.12.0sD.15.5sE.20.0s
A
8.Arockisdroppedoffacliffandstrikesthegroundwithanimpactvelocityof30m/s.Howhighwasthecliff?
A.15mB.20mC.30mD.45mE.60m
D
9.Asoccerballatrestontheground,iskickedwithaninitialvelocityof10m/satalaunchangleof30
.Calculateitstotalflighttime,assumingthatairresistanceisnegligible.
A.0.5sB.1sC.1.7sD.2sE.4s
B
10.Ifalloftheforcesactingonanobjectbalancesothatthenetforceiszero,then
A.theobjectmustbeatrest
B.theobject’sspeedwilldecrease
C.theobjectwillfollowaparbolictrajectory
D.theobject’sdirectionofmotioncanchange,butitsspeedcannot
E.Noneoftheabove
E
11.Thecoefficientofstaticfrictionbetweenaboxandarampis0.5.Theramp’sinclineangleis30
.Iftheboxisplacedatrestontheramp,boxwill
A.acceleratedowntheramp
B.acceleratebrieflydowntherampbutthenslowdownandstop
C.movewithconstantvelocitydowntheramp
D.notmove
E.Cannotbedeterminedfromtheinformationgiven
A
12.A20Nblockisbeingpushedacrossahorizontaltablebyan18Nforce.Ifthecoefficientofkineticfrictionbetweentheblockandthetableis0.4.findheaccelerationoftheblock
A.0.5m/s
B.1m/s
C.5m/s
D.7.5m/s
E.9m/s
C
13.Astoneisthrownhorizontallywithaninitialspeedof30m/sfromabridge.Findthestone’stotalspeedwhenitentersthewater4secondslater(Ignoreairresistance.)
A.30m/sB.40m/sC.50m/sD.60m/sE.70m/s
C
14.Whichoneofthefollowingstatementsistrueconcerningthemotionofanidealprojectilelaunchedatanangleof45
totheborizontal?
A.Theaccelerationvectorpointsoppositetothevelocityvectoronthewayupandinthesamedirectionasthevelocityvectoronthewaydown
B.Thespeedatthetopofthetrajectoryiszero.
C.Theobject’stotalspeedremainsconstantduringtheentireflight
D.Thehorizontalspeeddecreasesonthewayupandincreasesonthewaydown
E.Theverticalspeeddecreasesonthewayupandincreasesonthewaydown
E
15.Whichpairofforcescanproducearesultantof15newtons?
A.20N,20NB.25N,5NC.5N,5ND.7N,7NE.5N,3N
A
16.Twocratesarestackedontopofeachotheronahorizontalfloor,crate#1isonthebottom,andcrate#2isonthetop.Bothcrateshavethesamemass.ComparedwiththestrengthoftheforceF
necessarytopushonlycrate#1ataconstantspeedacrossthefloor,thestrengthoftheforceF
necessarytopushthestackatthesameconstantspeedacrossthefloorisgreaterthanF
because
A.theforceoftheflooroncrate#1isgreater
B.thecoefficientofkineticfrictionbetweencrate#1andthefloorisgreater
C.theforceofkineticfriction.Butnotthenormalforce,oncrate#1isgreater
D.thecoefficientofstaticfrictionbetweencrate#1andthefloorisgreater
E.theweightofcrate#1isgreater
A
17.Acrateofmass100kgisatrestonahorizontalfloor.Thecoefficientofstaticfrictionbetweencrateandtheflooris0.4,landthecoefficientofkineticfrictionis0.3.AforceFofmagnitude344Nisthenappliedtothecrate,paralleltothefloor.Whichofthefollowingistrue?
A.Thecratewillaccelerateacrossthefloorat0.5m/s
B.Thestaticfrictionforce,whichisthereactionforcetoFasguaranteedbyNewton’sthirdlaw.willalsohaveamagnitudeof344N
C.Thecratewillslideacrossthefloorataconstantspeedof0.5m/s
D.Thecratewillnotmove
ENoneoftheabove
D
18.Ablockofmassmisatrestonafrictionless,horizontaltableplacedinalaboratoryonthesurfaceoftheearth.Anidenticalblockisatrestonafrictionless,horizontaltableplacedonthesurfaceofthemoon.LetFbethenetforcenecessarytogivetheearth-houndblockanaccelerationofaacrossthetable.Giventhatg
isonesixthofg
theforcenecessarytogivethemoon-boudblockthesameaccelerationaacrossthetableis
A.F/12B.F/6C.F/3D.FE.6F
D
19.Astheanglebetweentwoconcurrentforcesincreases,themagnitudeoftheirresultant
A.increasesonlyB.decreasesandthenincreases
C.increasesandthendecreasesD.remainsthesameE.decreasesonly
E
20.Agirlwalks2metersnorth,4meterswest,and2meterssouth.Herfinaldisplacementis
A.4meastB.4mwestC.2mnorthD.2msouthE.5mnorthwest
B
21.Acartispulledbyaropemakinganangleof45
tothehorizontal.If100newtonsofforceareappliedtotherope,themagnitudeofthehorizontalcomponentforceisapproximately
A.45NB.141NC.100ND.80NE.71N
E
22.Amoonofmassmorbitsaplantofmass100m.LetthestrengthofthegravitationalforceexertedbytheplanetonthemoonbedenotedbyF
andletthestrengthofthegravitationalforceexertedbythemoonontheplanetbeF
.Whichofthefollowingistrue?
A.F
=100F
B.10F
=F
C.F
=F
.D.F
.=10F
E.F
.=100F
23.Atthesurfaceoftheearth,anobjectofmassmhasweightw.Ifthisobjectistransportedtoanaltitudethat’stwicetheradiusoftheearth,then,atthenewlocation
A.itsmassism/2anditsweightisw/2B.itsmassismanditsweightisw/2
C.itsmassism/2anditsweightisw/4D..itsmassismanditsweightisw/4
E..itsmassismanditsweightisw/9
E
24.Ifthedistancebetweentwopointparticlesisdoubled,thenthegravitationalforcebetweenthem
A.decreasesbyafactorof4B.decreasesbyafactorof2
C.increasesbyafactorof2D.increasesbyafactorof4
E.Cannotbedeterminedwithoutknowingthemasses
25.Theresultantofa3-newtonanda4-newtonforceactingsimultaneouslyonanobjectatrightanglestoeachotheris,innewtons
A.0B.1C.3.5D.5E.7
D
26.Twoforceacttogetheronanobject.Themagnitudeoftheirresultantisleastwhentheanglebetweentheforcesis
A.0B.45C.60D.90E.180
E
27.Theresultantofa5-newtonanda12-newtonforceactingsimultaneouslyonanobjectinthesamedirectionis,innewtons.
A.0B.5C.7D.13E.17
E
28.Anobjectismovingaroundacircleofradius1.5metersataconstantvelocityof7meterspersecond.Thefrequencyofthemotion,inrevolutionpersecond,is
A.0.24B.0.53C.0.67D.0.74E.0.98
D
29.Anobjectundergoesuniformacceleratedmotion.Iftheradiusofthepathis2metersandtheperiodisequalto4seconds,themagnitudeofthecentyipetalaccelerationisequalto
A.5m/s
B.10m/s
C.20m/s
D.25m/s
E.30m/s
A
30.Anobjectundergoesuniformacceleratedmotion.Iftheradiusofthepathisequalto1.5metersandthemagnitudeofthecentripetalaccelerationisequalto6m/s
themagnitudeofthetangentialvelocityisequalto
A.3m/sB.4m/sC.5m/sD.6m/sE.9m/s
A
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