香港物理奥林匹克竞赛.doc

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1、HongKongPhysicsOlympiad20042004年香港物理奧林匹克競賽WrittenExamination筆試JointlyOrganizedbyEducationandManpowerBureau教育統籌局HongKongPhysicalSociety香港物理協會TheHongKongUniversityofScienceandTechnology香港科技大學共同舉辦May30,20042004年5月30日Thefollowingsymbolswillbeusedthroughouttheexaminationpaperunlessotherwisespecifie

2、d:b5E2RGbCAPg–gravitationalaccelerationonEarthsurface,9.8(m/s2>p1EanqFDPwG–gravitationconstant,6.67x10-11(Nm2/kg2>e–chargeofanelectron,-1.6x10-19(As>e0–electrostaticconstant,8.85x10-12(As>/(Vm>DXDiTa9E3dme–electronmass,9.11x10-31kgc–speedoflightinvacuum,3.0x108m/s除非特別說明，本卷將使用下列符號：g–地球表面重力加速度,9

3、.8(m/s2>G–重力常數,6.67x10-11(Nm2/kg2>e–電子電荷,–1.6x10-19(As>e0–靜電常數,8.85x10-12(As>/(Vm>me–電子質量,9.11x10-31kgc–真空光速,3.0x108m/sThefollowingconditionswillbeappliedunlessotherwisespecified:RTCrpUDGiTAllobjectsarenearEarthsurfaceandthegravityispointingdownwards.5PCzVD7HxANeglectairresistance.Allspeedsare

4、muchlowerthanthespeedoflight.除非特別說明，本卷將使用下列條件：所有物體都處於地球表面，重力向下；忽略空氣阻力；所有速度均遠低於光速.MultiplechoicequestionsMultiplechoicequestions(2pointseach.(2pointseach.Selectoneanswerineachquestion.Selectoneanswerineachquestion.>>jLBHrnAILg选择题選擇題<每道题二分，每道题选择一个答案）<每道題二分，每道題選擇一個答案）MC-1MC-118/18Whichofthefollow

5、ingprovidesthelargestbuoyancytoatotallysubmergedobject?Whichofthefollowingprovidesthelargestbuoyancytoatotallysubmergedobject?xHAQX74J0X(A>shallowseawater(B>shallowfreshwater(C>deepfreshwat(A>shallowseawater(B>shallowfreshwater(C>deepfreshwatererLDAYtRyKfE(D>oil(E>oilandfreshwatermixture(D>oil

6、(E>oilandfreshwatermixtureZzz6ZB2Ltk选择题選擇題11下面哪一种情况一完全浸没物体会受到最大浮力下面哪一种情况下面哪一種情況會會使使完全浸没物体受到最大浮力完全浸沒物體受到最大浮力？？dvzfvkwMI1(A>(A>浅海水淺海水<

7、string:Anypointonthestring:EmxvxOtOco(A)movesinthesamedirectionasthewmovesinthesamedirectionasthewaveaveSixE2yXPq5(B)movesperiodicallywithadifferentfrequencymovesperiodicallywithadifferentfrequencythanfromfromthatofthewavethatofthewave6