资源描述：
《13春学期《理论力学》在线作业1》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。
1、13春学期《理论力学》在线作业1NortheasternUniversity,14spring,13autumn,13springsemester,theoreticalmechanics,onlinehomework,1Totalscore:100testtime:一RadioexaminationRadioexaminationquestions(20questions,100points)One2.1iftheFlandF2areequalinprojectionontheXaxis,thetwoforcesmustbeequa1.()A.B.wrongFullmarks:
2、5Two14.3therigidbodyrotatesaroundthefixedaxisandeliminatestheconditionoftheEastconstraint.Thisaxisisthecentralprincipalaxisofinertia・A.B.wrongFullmarks:5Three4.1theequilibriumequationsofthespatialcrossforcesystemarethreeprojections:.（）A.B.wrongFullmarks:5Four9.1ingeneral,thereisonlyonepointat
3、zerospeedineachinstantaneousplanepattern・（）A.B.wrongFullmarks:5FiveThe14.2objectsystemconsistsoftwoobjects,AandB,ofmassmAandmB,respectively,placedonasmoothhorizontalsurface・AhorizontalforceifthesystemcanbedescribedwithF,dynamicandstaticmethodbetweenAandBtwoobjectinteractionsofsizeF・（）A.correc
4、tB.errorFullmarks:5SixWhen6.1pointsareusedascurvilinearmotion,themagnitudeofaccelerationisequaltothemagnitudeofvelocityandthederivativeoftime・()A.B.wrongFullmarks:5SevenTheadaptationconditionfortheratesynthesistheoremof8.3pointsis(va=ve+vr)A.convectedmotioncanonlybetranslationalB.variousadapt
5、edmovementsareadaptedC.involvesmotiononlybyrotationD.convectedmotioniszeroFullmarks:5EightThevariationofthemomentofmomentumofa12.1.particlesystemisdependentonexternalforcesandhasnothingtodowithinternalforces・（）A.correctB.errorFullmarks:5Nine6.3pointsforlinearmotion,theequationofmotionisx=27t-
6、t3,theunitofXism,andtheunitofTiss.Thedistancetraveledbetweent二0andt二7sisasfollowsA.154mB.262mC.54mD.208mFullmarks:5Ten6.3pointsforuniformmotion,itstangentialaccelerationoperationanswerdidnotupload,firstforeveryonetoreviewtheuse,andifyouneedtoanswerthespecific,seemyregistrationnametofindzero.T
7、herefore,ifthetangentialaccelerationofacertaininstantaneouspointisequaltozero,thepointwillmoveatauniformspeed・（）A.B.wrongFullmarks:5Eleven1.4,thetwoforcesinthetwoforceequilibriumaxiom,thetwoforcesinactionandthelawofreaction,arethesame・（）A.B.w
