phys 1002 physics 1 (fundamentals) june 2008

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1、93/06(a)Semester1,2008Page1of11THEUNIVERSITYOFSYDNEYFACULTIESOFARTS,EDUCATION&SOCIALWORK,ENGINEERINGANDSCIENCEPHYS1002PHYSICS1(FUNDAMENTALS)JUNE2008Timeallowed:THREEHoursMARKSFORQUESTIONSAREASINDICATEDTOTAL:90MARKSINSTRUCTIONS•Allquestionsaretobeanswered.•Useaseparateanswerbookfo

2、rsectionAandsectionB.•Allanswersshouldincludeexplanationsintermsofphysicalprinciples.DATADensityoffreshwaterat20°Cand1atmρ=1.00×103kg.m-3Densityofseawaterat20°Cand1atmρ=1.024×103kg.m-3AtmosphericairpressureP=1.00×105PaFreefallaccelerationatearth'ssurfaceg=9.81m.s-2Speedoflightinv

3、acuumc=3.00×108m.s-193/06(a)Semester1,2008Page2of11SECTIONAQuestion1Acorkisheldunderwater,completelyimmersed,andthenreleased.(a)Drawalabelleddiagramtoshowtheforce(s)actingonthecorkimmediatelyafterrelease.Yourdiagramshouldclearlyidentifyeachforce.(b)Isthecorkinstaticequilibriumimm

4、ediatelyafterrelease?Explainyourreasoning.(c)Considertheforce(s)onthecorkafterithasfloatedtothesurface.Explainhowtheseforcesdifferfromthoseinpart(a).(5marks)Question2urrThediagramshowsthevectorsrepresentingthegravitationalforceFg,accelerationa,andrvelocityvofasatelliteinacircular

5、orbitaroundtheEarth.Yourfriend(notaphysicsstudent)givesheropinionsaboutthediagram.Brieflycommentonthephysicsofeachopinion.(a)“ThegravitationalforceispullingthesatellitetowardstheEarthanditisalsoacceleratingtowardstheEarth.Thereforethesatellitecannotremaininitscircularorbit.”(b)“A

6、nastronautinthesatellitecannotbeweightlessbecausetheforceofgravityispullinghimtowardstheearth.”(c)“SatellitesmovearoundtheEarth.Butthedishformysatellitetelevisionservicepointsatthesamelocationinthesky.Surely,itshouldmovetofollowthesatelliteinitsorbit.”(d)“IftheEarthsuddenlydisapp

7、eared,thesatellitewouldflyoffintospacemovingataconstantvelocity”(5marks)93/06(a)Semester1,2008Page3of11Question3Arollercoastergoesdownaslopeandaroundaverticalloop.Doesapassengerintherollercoasterexperienceagreaterapparentweightatthetopofthelooporthebottom?Explainyouranswerinterms

8、ofphysicalprinciples.Includefree-bodydia