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1、西电《大学物理》13春在线作业14spring13autumnWestelectricity"CollegePhysics"13springonlinehomeworkFirst,radioquestions(25questions,100points)1.aparticleonasmoothsurfacemovesalongacurveundertheactionofanexternalforce,andiftheforceissuddenlycancelled,themasspointwillactas(a)A.
2、uniformvelocitycurvemotionB.uniformrectilinearmotionC.stopexercisingD.slowmotion2.,aparticlemakesasimpleharmonicvibration,andwhenitmovesfromtheequilibriumpositiontothepositivedirectionoftheXaxis,theshortesttimerequiredfromthe1/2largestdisplacementtothemaximumdi
3、splacementis()A.T/4B.T/12C.T/6D.T/81.themomentumconservationoftheendoplasmicsystematthatintervaloftime,iftheparticlesystemissubjectedto()・A.themomentofforceiszeroatalltimesB.theworkdonebyanoutsideforceisalwayszeroC.theexternalforcevectorandalwayszeroD.theintern
4、alforcevectorandalwayszero2.whenaparticlemovesatauniformvelocity,itsvelocityandaccelerationvaryA.themomentofforceiszeroatalltimesB.theaccelerationremainsconstantandthespeedchangesC.twoarechangingD.twoareunchangedAbout5.oftheidealgasstateequationPV/T=constant,wh
5、ichstatementiscorrectA.forthesamequalityofanygas,thisquantityisthesameB.onthequalityofdifferentgasspecies,thequantitiesarethesameTheC.ofthesamequalityasthesamekindofgas,thequantitiesarethesameTheD.constantisthesame,equaltoR6.inthedoubleslitinterferenceexperimen
6、t,thewidthofthetwoslitsisequal.Ifthewidthofoneoftheslitsnarrowsslightly,thenThespacingoftheA.interfeTencefringesbecomeswider・NarrowingofthespacingofB.interferencefringes.ThespacingoftheC・interferencefringesremainsunchanged,buttheintensityattheoriginalminimumisn
7、olongerzero.D.nolongerinterfere・7.inthevacuumthereisauniformlychargedsphereandauniformlychargedsphere,andiftheirradiusandtheamountofelectricitytheycarryareequal,thentherelationbetweentheirelectrostaticenergyis()TheelectrostaticenergyofaA.sphereisequaltotheelect
8、rostaticenergyofthesphereTheelectrostaticenergyoftheB.sphereisgreaterthanthatofthesphericalsurfaceTheelectrostaticenergyoftheC・sphereislessthanthatofthesphericalsurfaceTheel
