Quiz (Fluid Mechanics) Answers

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1、SJPOTrainingFluidMechanicsQuizTanJingLongChikChengYaoJune12,20141.Apieceofpureice,onewithunfrozenwater,andonewithanembeddedironwasher oatonwaterlledtotherimoftheglasses.Whathappenstothewaterlevelwhentheicecompletelymelts?A.Nochange

2、Nochange

3、NochangeB.Nochange

4、Over ows

5、Over owsC.Nochang

6、e

7、Nochange

8、Over owsD.Nochange

9、Nochange

10、DropsSolution:D2.Auniformtube,closedatbothends,containsa57cmlongcolumnofmercurywhichdividestwocolumnsofairofeach30cmlong,asshowninthediagrambelow.IfthetubeisthensetuprightonEarth,whatwilltheeventuallengthsofthetopandbottomcolumnseventuallyberespect

11、ively?A.30cm;30cmB.35cm;25cmC.10cm;40cmD.45cm;15cmE.40cm;20cmSolution:E3.Abeakerofbase40cm2containswatertoacertaindepth.Asmallblockofdimensions4cm4cm4cmisbeingplacedintothebeaker.Theriseinthewaterlevelis1:2cm.Thedensityoftheblockis1A.0.25thatofwaterB.0.45thatofwaterC.0.60thatofwaterD.

12、0.75thatofwaterE.1.20thatofwaterSolution:D4.Twoidenticalcupswiththeshapeshownbelowcontainsamemassoftwodierenttypesofliquidwithdensities1>2.Whichstatementiscorrectaboutthepressure(P1andP2)duetotheliquidsatthebottomofthecups?A.P1isalwayslargerthanP2.B.P1isalwaysequaltoP2.C.P1isalwayssm

13、allerthanP2.D.P1maybelargerthanorequaltoP2.E.P1maybesmallerthanorequaltoP2.Solution:A5.Supposethetwoplatesofabalancescaleareinequilibriumwhilethescaleiskeptunderwater(seegure).Ononesideisa1kgironweight(Fe)andanunknownamountofmercury(Hg)ontheother.Ifthedensityofironis7870kg/m3andthedens

14、ityofmercuryis13550kg/m3,whenyouliftitoutofthewaterA.thescaleisstillbalanced.B.youcanbalanceitagainbyadding180gtotheplateontheleft.C.youcanbalanceitagainbyadding97gtotheplateontheleft.D.youcanbalanceitagainbyadding58gtotheplateontheleft.E.youcanbalanceitagainbyadding29gtotheplateonthele

15、ft.Page2Solution:D6.Thediagrambelowshowsanimmersedtest-tubewithitsopenendfacingdownwardsandanairbubbletrappedinthetest-tube.Atacertainheight,thetest-tubeisnotmoving.Ifwepourmorewaterintothebeaker,thetest-tubewillA.remainswhereitis.B.accelerateupwards.C.acceleratedownwards.D.osc