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1、浙江大学2003-2004学年第二学期期末考试《Physics（Ⅰ）》课程试卷开课学院理学院任课教师考试时间120分钟姓名专业学号组号 _________题序选择题一二三四五六七八总分得分评卷人MolargasconstantR=8.31J×mol-1×K-1Boltzmannconstantk=1.38´10-23J×K-1Speedoflightinavacuumc=3.00´108m/sⅠ.Multiplechoices(thereisonecorrectansweronly):1.Thecenterofma
2、ssasystemofparticleshasaconstantvelocityif:A.theforcesexertedbytheparticlesoneachothersumtozero.B.theexternalforcesactingonparticlesofthesystemsumtozero.C.thevelocityofthecenterofmassisinitiallyzero.D.theparticlesaredistributedsymmetricallyaroundthecenterofmass.
3、E.thecenterofmassisatthegeometriccenterofthesystem.2.Awheelstartsfromrestandhasanangularaccelerationthatisgivenbyα(t)=6t2,wheretisinsecondsandαisinradianspersecond-squared.Thetimeittakestomake10rev（转）is:A.2.8sB.3.3sC.4.0sD.4.7sE.5.3sP3.Aspool(线轴)ofwirerestsonaho
4、rizontalsurfaceasinFigure.Asthewireispulled,thespooldoesnotslipatthecontactpointP.Onseparatetrials,eachoneoftheforcesF1,F2,F3,andF4isappliedtothespool.Amongthese4forces,whichonecanmakethespoolrollinclockwise?(NotethatthelineofactionofF2passesthroughP.)locatedint
5、heTomb,DongShenJiabang,deferthenextdayfocusedontheassassination.Linping,Zhejiang,1ofwhichliquorwinemasters(WuzhensaidinformationisCarpenter),whogotAfewbayonets,duetomissedfatal,whennightcame7(of7pages)A.F1B.F2C.F3D.F4E.noneoftheabove1.ApulleywithradiusRandrotati
6、onalinertiaIisfreetorotateonahorizontalfixedaxisthroughitscenter.Astringpassesoverthepulley.Massm1isattachedtooneendandmassm2isattachedtotheother.Atonetimem1ismovingdownwardwithspeedv.Ifthestringdoesnotsliponthepulley,themagnitudeofthetotalangularmomentum,aboutt
7、hepulleycenter,ofthemassesandpulley,consideredasasystem,isgivenby:A.(m1-m2)vR+Iv/RB.(m1+m2)vR+Iv/RC.(m1-m2)vR-Iv/RD.(m1+m2)vR-Iv/RE.noneoftheabove2.Anidealspring,withapointerattachedtoitsend,hangsnexttoascale.Witha100-Nweightattachedandatrest,thepointerindicates
8、“40”onthescaleasshown.Usinga200-Nweightinsteadresultsin“60”onthescale.UsinganunknownweightXinsteadresultsin“30”onthescale.TheweightofXis:A.10NB.20NC.30ND.40NE.50N3.Th
