SAT物理模拟试题.doc

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1、SAT模拟试题(1)1.Anobjectthat’smovingwithconstantspeedtravelsoncearoundacircularpath.Truestatementsaboutthismotionincludewhichofthefollowing?A.ThedisplacementiszeroB.TheaveragespeediszeroC.TheaccelerationiszeroD.NoneoftheaboveA2.Whichofthefollowingmustalwaysbetrue?1.Ifanobje

2、ct’saccelerationisconstant,thenitmustmoveinastraightline2.Ifanobject’saccelerationiszero,thenitsspeedmustremainconstant3.Ifanobject’sspeedremainsconstant,thenitsaccelerationmustbezero.A.1and2onlyB.1and3onlyC.2onlyD.3onlyE.2and3onlyC4.Africtionlessinclinedplaneoflength20

3、mhasamaximumverticalheightof5m.Ifanobjectofmass2kgisplancedontheplame.Whichofthefollowingbestapproximatesthenetforceitfeels?A.5NB.10NC.15ND.20NE.30NA5.Apersonwhoweighs800Nstepsontoascalethatisonthefloorofanelevatorcar.Iftheelevatoracceleratesupwardatarateof5m/s,whatwill

4、thescaleread?A.400NB.800NC.1000ND.1200NE.1600ND6.Apersonstandingonahorizontalfloorfeelstwoforces:thedownwardpullofgravityandtheupwardsupportingforcefromthefloor.TheretwoforcesA.haveequalmagnitudesandfromanaction/reactionpairB.haveequalmagnitudesbutdonotfromanaction/reac

5、tionpairC.haveunequalmagnitudesandfromanaction/reactionpairD.haveunequalmagnitudesanddonotfromanaction/reactionpairE.NoneoftheaboveB7.Howlongwouldittakeacar,startingfromrestandacceleratinguniformlyinastraightlineat5m/s,tocoveradistanceof200m?A.9sB10.5sC.12.0sD.15.5sE.20

6、.0sA8.Arockisdroppedoffacliffandstrikesthegroundwithanimpactvelocityof30m/s.Howhighwasthecliff?A.15mB.20mC.30mD.45mE.60mD9.Asoccerballatrestontheground,iskickedwithaninitialvelocityof10m/satalaunchangleof30.Calculateitstotalflighttime,assumingthatairresistanceisnegligib

7、le.A.0.5sB.1sC.1.7sD.2sE.4sB10.Ifalloftheforcesactingonanobjectbalancesothatthenetforceiszero,thenA.theobjectmustbeatrestB.theobject’sspeedwilldecreaseC.theobjectwillfollowaparbolictrajectoryD.theobject’sdirectionofmotioncanchange,butitsspeedcannotE.NoneoftheaboveE11.Th

8、ecoefficientofstaticfrictionbetweenaboxandarampis0.5.Theramp’sinclineangleis30.Iftheboxisplacedatrestontheramp