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1、13春学期《理论力学》在线作业2（13springsemestertheoreticalmechanicsonlinehomework2）NortheasternUniversityspring13autumn14bigeast13springsemester"theoreticalmechanics"onlinehomework2Totalscore:100testtime:-RadioexaminationThereare20questions(100points)One10.1nonrigidrigidrodAB,paralleltotheground,bothendsofasoli
2、dball,itsmassisM1,m2.Ifm1>m2,regardlessoftheairresistance,whentherodABundertheactionofgravityfromhorizontalstationarypositionintomotion,()landing.A.endssimultaneouslyB.AendfirstC.BendfirstD.can'tjudgeFullmarks:5TwoWhenthe6.2pointmovesataconstantspeed,theaccelerationofthepointiszero.()A.B.wrongFull
3、marks:5ThreeTheinstantaneousvelocitycenterofthecomponentoftheplanemotioninthemechanismshowninFig.7is9.2.A.ApointB.OpointC.BpointD.infinitepointFullmarks:5Four2.2roleinthehomeworkanswerdidnotupload,firstforeveryonetoreviewtheuse,ifyouneedtoanswerthespecificlookatmyregistrationnametofindtherigidbody
4、onthesameplanewithinapointofthethreeforces,willmakerigidbodybalance.()A.B.wrongFullmarks:5FiveTheadaptationconditionofthetheoremofvelocitycompositionva=ve+vrat8.3pointsis()A.convectedmotioncanonlybetranslationalB.variousadaptedmovementsareadaptedThemotionofC.canonlyberotationalD.convectedmotionisz
5、eroFullmarks:5Six3.3aknownforceplanetoforceMAandprincipalmomentsimplifiedplanesofA,twoB0,MB=0,theresultsofthesimplifiedsystemofforcesarethefollowing(may).A.resultantforceB.resultantorresultantpairsC.resultantpairD.cannotbesimplifiedFullmarks:57.homeworkanswerhasnotuploaded,firstforeveryonetoreview
6、theuse,ifneedtoanswerthespecifictoseemyregistrationnametofindThecircularwheelwith8.2RradiusismadebypurerollingwithuniformangularvelocityW,whichdrivestherodABtorotatearoundBasthefixedaxis,andDisthecontactpointbetweenthewheelandtherod.IfthewheelcenterCistakenasthefixedpointandtherodABisthemovingsyst
7、em,thenthevelocityofthemovingpointis()A.*w,verticalABB.Rw,paralleltoBEindirectionC.*w,verticalBCD.Rw,parallelBAdirectionFullScore:5pointsEightThetwoforcesinthetwoforceequilibriumaxiom,thetwoforcesinthelawofaction
