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1、《PhysicsI》课程期中考试试卷开课学院：理学院考试形式：闭卷允许带非存储计算器、纸质词典入场考试时间：2010年5月6日所需时间100分钟姓名专业学号组号LMultiple-choice:(thereisonecorrectansweronly)1.Astoneisthrownhorizontallyandfollowsthepathxyz.Thedirectionoftheaccelerationofthestoneatpointyis:A.IB・fC・'D./2.Anobjectistravelingaroundacircularorbi
2、twitha12mradius.Atoneinstantitsspeedis6m/sandisincreasingat4m/s2.Atthatinstantthemagnitudeofitsaccelerationis:A・2tn/s2.B.3m/s2.C.4mA2.D.5m/s2c八a八3.Anobjectismovinginx-yplanewithamotionfunctionofr=2ti_5tjtheobjectisA・MovinginalineB•MovingnotinalineC.Movingwithconstantvelocityin
3、alineD.Movingwithconstantspeedinaline4.Aparticlemovesinxdirection,itstartsfromtheoriginalpositionwithavelocityofv()=2.Theaccelerationoftheparticleisa=6v(visthevelocityoftheparticle).ThemotionoftheparticleisdependentonA.x=2f+2f'B.兀二4+2/+尸.C.x=4+
4、(e6r-l)D.x=4+2/5.Aparticlemovesi
5、nxdirection,itstartsfromtheoriginalpositionwithavelocityofvo-4.Theaccelerationoftheparticleisa=3+2x・Thevelocityoftheparticle,atx=2.isA.4B.2a/3・C.2a/5D.66.Aparticlemovesinacirclewithradiusof7?=0.0625/77,itsmotionisdependentonS=2f—0.5尸(S/)•Themagnitudeofitsacceleration,att=ls.is
6、A.3B.4.C.5D.61.Anobjectismovinginx-yplanewithamotionfunctionofr=(10-5广)Z+10,themagnitudeofitstangentialandcentripetalaccelerationatt=lsisA.5,5V2B.5V2,5.C.5V2,5V2D.5,52.A2kgparticleisactedbyaconservationforceandstartstomovefromoriginalpointalongthexaxis.Thepotentialenergy,relat
7、ivetotheconservationforce,isgivenby(7(x)=2x2-3x4,whereUisinjouleandxisinmeter.Whentheparticleisatx=l.0m,itsaccelerationandvelocityareA.4m/s2,1m/sB.-4m/s2,1m/sC.4m/s2,2m/sD.Am/s2.2m/s3.Awheelstartsfromrestandhasanangularaccelerationgivenby皿()二6广，wheretisinsecondandaisinradiansp
8、ersecond-squared.Afterithasturnedthrough1Orevitsangularvelocityis:A・63rad/s.B.75rad/s.C・S9rad/s.D.l30rad/s.4.AsmallballwithmassmandradiusrfromrestatthepositionshownandrotateswithoutslippingalongthelooptrackofradiusR(7?»r).Whatisthesmallestvalueofysuchthattheballwillrotatewitho
9、utlosingcontactwiththetrack?A.2RB.R/2C.7R/10D.3R/45.A4.0kgsol
