2006年香港物理奥林匹克竞赛试题

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1、Ёढ⠽⧚ゲ䌯㔥www.100wuli.comᅬᮍᘏキ˖೷ᠡᄺд㔥www.100xuexi.comHKPhOଉཽढ෻ᤁ᝛2006HongKongHighSchoolPhysicsOlympiad200662006ڣଉཽխᖂढ෻ᤁ᝛WrittenExamination࿝ᇢJointlyOrganizedbybyyEducationandManpowerBureaupowerBuwerBuඒߛอᤂݝTheHongKongPhysicalSocietygPhysicPhysiwwwଉཽढ෻wwww.100wuli.

2、comᖂᄎTheHongKongUniversityofScienceandTechnologyUniversityniversitଉ㔥ཽઝՕᖂ䌯㔥٥ٵᜰᙄMay28,20062006ڣ5281Ёढ⠽⧚ゲ䌯㔥www.100wuli.comᅬᮍᘏキ˖೷ᠡᄺд㔥www.100xuexi.comЁढ⠽⧚ゲ䌯㔥www.100wuli.comᅬᮍᘏキ˖೷ᠡᄺд㔥www.100xuexi.comHKPhOଉཽढ෻ᤁ᝛2006Thefollowingsymbolsandconstantswillbeusedthrough

3、outtheexaminationpaperunlessotherwisespecified:2g–gravitationalaccelerationonEarthsurface,9.8(m/s)-1122G–gravitationconstant,6.67x10(Nm/kg)-19e–chargeofanelectron,–1.6x10(As)-120–electrostaticconstant,8.85x10(As)/(Vm)-31me–electronmass=9.11x10kg8c–speedof

4、lightinvacuum,3.0x10m/sRadiusofEarth=6378km11Sun-Earthdistance=1.5x10m8Earth-Moondistance=3.84x10m33Densityofwater=1.0x10kg/m33Densityofiron=7.7x10kg/m33Densityofmercury=13.6x10kg/mSpeedofsoundinair=340m/sೈॺ௽ܑࣹࣔΔܡঞء࠴ലࠌشՀ٨ฤᇆࡉൄᑇΚ2g–ףԺૹ૿।෺چຒ৫,9.8(m/s)-1122G–ૹ

5、Ժൄᑇ,6.67x10(Nm/kg)-19e–ሽ՗ሽ๛,–1.6x10(As)-120–ᙩሽൄᑇ,8.85x10(As)/(Vm)-31me–ሽ՗ᔆၦ,9.11x10kg8c–ట़٠ຒ,3.0x10m/swww.100wuli.comת෺چஉ=6378km11ၺ-چ෺၏ᠦ=1.5x10m8چ෺-෺၏ᠦ=3.84x10mm33ऱയ৫=1.0x10kg/m33ᥳऱയ৫=7.7x10kg/mg/m/m33Ꭼऱയ৫=13.6x10x1010kg/m़௛խᜢຒ=340m/s0m/sm/sThefollowingco

6、nditionswillbeappliedunlessotherwisespecified:wingconditionsingcondition1)AllobjectsarenearEarthsurfaceandthegravityispointingdownwards.AllobjectsarAllobjectsa2)Neglectairresistance.2)NeglectaiNeglec3)Allspeedsaremuchsmallerthanthespeedoflight.3)Allspeೈॺ௽ܑ

7、ࣹࣔΔܡঞՀڶࢬ࠴ء࣍شᔞലٙය٨ംᠲΚೈॺ௽1)ࢬٻԺૹΔ૿।෺چ࣍๠ຟ᧯ढڶՀΙ2)࢙ฃ़௛ॴԺΙ3)ࢬ٠࣍՛᎛݁৫ຒڶຒΖ2Ёढ⠽⧚ゲ䌯㔥www.100wuli.comᅬᮍᘏキ˖೷ᠡᄺд㔥www.100xuexi.comЁढ⠽⧚ゲ䌯㔥www.100wuli.comᅬᮍᘏキ˖೷ᠡᄺд㔥www.100xuexi.comHKPhOଉཽढ෻ᤁ᝛2006MultipleChoiceQuestions(2pointseach.Selectoneanswerineachquestion.)ᙇᖗᠲΰޢሐᠲ2։Δޢሐᠲ

8、ᙇᖗԫଡ࿠ூαMC1GiventhatthemoonrevolvesaroundEarthataperiodofabout27.3days,usetheparametersgiveninpage-2tofindthemassofEarth.ܓش଄଄2༼ࠎऱᇷறΔאॽՕપޢ27.3៥چ෺᠏ԫڻΔ۷ጩچ෺ऱᔆၦΖ24242424(a)2.3x10kg(b)4.6x10kg(c)6.0x10kg(d)7.8x10kg2