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1、…………试卷装订线………………装订线内不要答题，不要填写考生信息………………试卷装订线…………姓名学号专业班级学院武汉理工大学考试试卷（期中卷）2012~2013学年2学期大学物理C（双语）课程闭卷时间120分钟，72学时，4.5学分，总分100分，占总评成绩70%2013年5月6日题号一二三四五六七八九十合计满分181864100得分得分一、选择题(本题共18分，每小题3分)1.Aparticleofmassm,initiallyatrest,isacceleratedbyaforcethatincreasesintime
2、asF=Ct2,whereCisaconstant.DetermineitspositionxasafunctionoftimeandtheworkWbytheforcefromt=0tot=t.Ans:()A.,;B.,;C.,;D.,2.TheelectricpotentialatpointsinanxyplaneisgivenbyV=2x2–3y2(V/m2).TheelectricfieldatpointP(3m,2m)isAns:()A.(V/m);B.(V/m);C.(V/m);D.(V/m)3.Apointch
3、argeqisplacedatonecornerofthecubeofedgel,asinFig.1-1.ThetotalfluxthroughthecubefacesisAns:()Fig.1-1A.;B.;C.;D..Fig.1-24.InFig.1-2,arodoflengthLhascharge-quniformlydistributedalongitslength.TakeV=0atr=∞,theelectricpotentialVatpointPisAns:().A.;B.;C.;D..5.Fig.1-3show
4、sawireofarbitraryshapecarryingacurrentIbetweenpointaandb.ThewireinaplaneatrightangletoauniformmagneticfieldB.Fig.1-3ThenthemagnitudeoftheforceonthewireisAns:().A.0;B.;C.;D..6.Whatisthespeedofaparticlewhosekineticenergyisequaltotwiceofitsrestenergy?A.;B.;C.;D..Ans:(
5、)得分二、填空题(本题共18分，每空2分)1.Abodymovesinacircleofradius3mwithitsspeedgivenbyv=3t－t3,withυinmeterspersecondandtinseconds,Att=2s,thetangentialaccelerationat=.Cabi2.Asatellite(卫星)ofmassmmovesinacircularorbitofradiusraroundaplanetofmassM.ThepotentialenergyUofthesystemis.3.I
6、nFig.2-1,awireisformedintoaclosedcircuitwithradiiaandb,andFig.2-1carriesacurrenti.Themagneticdipolemoment(磁矩)ofthecircuitis.54.InFig.2-2,aparallel-platecapacitorhasplatesofareaAandseparationdandhascharges+Qand–Q.Ifalargemetalsheetofthicknessbisplacedbetween,andpara
7、lleltoFig.2-2thecapacitor,nowthenetcapacitanceC=,andthestoredenergiesU=.5.Theprinciplesofthespecialtheoryrelativityareand.6.Figure2-3showsfouridenticalcurrentsi,andtwoAmperianpathsencirclingthem.Fig.2-3Find;.得分三、计算题(本题共64分)得分1.(12')InFig.3-1,athinrodofmassMandlengt
8、hlissuspendedverticallyfromafrictionlesspivotOatitsupperend.Amassmofputty(泥块)travelinghorizontallywithaspeedvstrikestherodatitsbottomandsticks(粘住
