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titleCollegePhysicsII(DalianUniversityofTechnology)1458633460中国大学mooc答案100分最新版content01PeriodicMotionUnitTest11、Amassof0.20kg,hungfromaspringwithaspringconstantof80.0N/m
,issetintoanup-and-downsimpleharmonicmotion.Ifthemassisdisplacedfromequilibriumby0.10mandreleasedfromrest,whatisitsspeedwhenmovingthroughtheequilibriumpoint?答案:2.0m/s2、TheFig.
isthe
v
(t
)curveforanobjectundergoingSHM.Whichofthefollowingistheoscillatingfunctionx
(t
)fortheobject?答案:3、Amassmattachedtoaverticalspring(withspringconstantk)isreleasedfromrestfromtherelaxedpositionofthespring.Whatistheamplitudeoftheresultingoscillation?答案:4、Amasshangingonaspringoscillatesvertically.IftheequilibriumpointoftheoscillationisadistancedbelowtherelaxedlengthofthespringandiftheamplitudeoftheoscillationisA.Whichisthemaximumkineticenergyoftheoscillation?
答案:5、Asimplependulumconsistsofamassivebobconnectedtotheendofaverylightstring.Ignoreairresistance.Whichoneofthefollowingchangesshouldbemadeinordertoincreasetheperiodofthependulum?答案:Increasethelengthofthestring.6、Ablockisattachedtoaspringhungvertically.Afterbeingslowlylowered,itishungatrestwiththespringstretchedby15.0cm.Iftheblockisraisedbackupandreleasedfromrestwiththespringunstretched,whatistheamplitudeofitsoscillations?答案:15.0cm7、Adampedharmonicoscillatorwiththenaturalangularfrequency
andverylittledampingisdrivenbyanexternalforce
.Whenitreachesthestablestate,theoscillatingangularfrequencyis______答案:8、ThegraphofvibrationoftheparticleinSHMisshowninthefigure.Theperiod
ofthevibrationequals___
s.
答案:(以下答案任选其一都对)4.8;
4.8s;
4.8s9、A1.0kg
blockisattachedtoaspringwithspringconstant16N/m
andisatrestonasmoothhorizontalplane.Itishitwithahammerandacquiresinstantaneouslyaspeedof0.40m/s.Thespeedoftheblockatx
=
A/2is
_____
m/s
(roundtotwodecimalplaces).
答案:0.3510、Anobjectofmassmisattachedtoahorizontalspring,stretchedtoadisplacementAfromequilibriumandreleased,undergoingharmonicoscillationsonafrictionlesssurfacewithperiod
.Theexperimentisthenrepeatedwithamassof4m.Theratio
ofthenewperiodofoscillationandtheoldperiodis_____
.
答案:(以下答案任选其一都对)2;
2.0作业01PeriodicMotionWeek1Chapter13PeriodicMotion1、Week1-ThehomeworkofChpater13
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02MechanicalWavesUnitTest21、答案:2、答案:3、答案:4、Whileaguitarstringisvibrating,yougentlytouchthemidpointofthestringtoensurethatthestingdoesnotvibrateatthatpoint.Whichnormalmodescannotbepresentonthestringwhileyouaretouchingitinthisway?答案:n=
1,3,5,…5、答案:75.0m6、
Thesixstringsofaguitararethesamelengthandundernearlythesametension,buttheyhavedifferentthicknesses.Onwhichstringdowavestravelthefastest?答案:Thethinneststring.7、答案:98、答案:9、
Atravelingwaveispropagatinginanelasticmediumandattimet
theparticleatpositionP
hasthemaximumdisplacement.ThepotentialenergyoftheparticleatpositionP
is
_____(fillingin“maximum”,“minimum”,or“zero”).
答案:(以下答案任选其一都对)ZERO;
zero10、Astretchedstringfixedattwoendshasamassof
0.08kg
andalengthof
8.00m.Thetensioninthestringis64.0N.Thereexistsastandingwaveonthestring.Forthethirdharmonic,thevibrationfrequencyis
Hz
(Keeponlytheintegerportion).
答案:15作业02MechanicalWavesWeek2Chapter15MechanicalWaves1、Week2-Thehomework1ofChpater15
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03SoundandHearingUnitTest31、Youuseanelectronicsignalgeneratortoproduceasinusoidalsoundwaveinair.Youthenincreasethefrequencyofthewavefrom100Hzto400Hz
whilekeepingthepressureamplitudeconstant.Whateffectdoesthishaveonthedisplacementamplitudeofthesoundwave?答案:Itbecomes1/4asgreat.
2、Atuningforkplacedovera0.57m
columnofairclosedonlyatitsbottomendproducesastandingwaveinthe3rdharmonic.Thespeedofsoundinairis342m/s.Whatisthefrequencyofthetuningfork?
答案:450Hz3、Astandingwaveiscreatedinanair-filledtubeopenatbothendswhenatuningforkoffrequency552Hz
isplacednearoneoftheopenends.Atuningforkoffrequency644Hz
producesthenexthigherharmonicforthistube.Assumethatthespeedofsoundinairis340m/s.Whatisthelengthoftheopentube?答案:1.85m4、Aflutehasalengthof58.0cm.Ifthespeedofsoundinairis343m/s,whatisthefundamentalfrequencyoftheflute,assumingitisatubeclosedatoneendandopenattheother?
答案:148Hz5、答案:6、AstoppedorganpipeoflengthLhasafundamentalfrequencyof
220Hz.Forwhichofthefollowingorganpipeswilltherebearesonanceifatuningforkoffrequency
660Hzissoundednexttothepipe?答案:AstoppedorganpipeoflengthL.7、Ifa
1000Hzsoundsourcemovesataspeedof50.0m/stowardalistenerwhomovesataspeedof30.0m/sinadirectionawayfromthesource,whatisthefrequencyheardbythelistener?(Thespeedofsoundis340m/s.)答案:1069Hz8、
Whentwotuningforksaresoundedatthesametime,abeatfrequencyof
5Hzoccurs.Ifoneofthetuningforkshasafrequencyof245Hz,thefrequencyoftheothertuningforkis
Hz.
答案:(以下答案任选其一都对)250;
2409、SupposethatspeakerAemitsasinusoidalsoundoffrequency
500HzandspeakerBemitsasinusoidalsoundwaveoffrequency
1000Hz.Ifwilltheinterferencehappenbetweenthesetwowavesmeeting?
__(fillinyesorno)
答案:(以下答案任选其一都对)No;
no;
NO10、Youwereatrestandapolicecarwithitssirenonwaspassingyouwithaconstantspeed.Youfoundthatthefrequenciesofthesirenwererespectively550Hz
and450Hz
whenthepolicecarwasmovingtowardandawayfromyou.Assumethatthespeedofsoundinairis
340m/s.Thespeedofthepolicecarwas
m/s.(Keeponlytheintegerportion)
答案:34作业02MechanicalWavesWeek3Chapter15MechanicalWaves1、Week3homework.
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作业03SoundandHearingWeek4Chapter16SoundandHearing1、Week4homework
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04TheNatureandPropagationofLightUnitTest41、Somecrystalsarenotisotropic:lighttravelsthroughthecrystalatahigherspeedinsomedirectionsthaninothers.Inacrystalinwhichlighttravelsatthesamespeedinthex-andz-directionsbutatafasterspeedinthey-direction,whatwouldbetheshapeofthewavefrontsproducedbyalightsourceattheorigin?答案:ellipsoidal,stretchedoutalongthey-axis.2、Theindexofrefractionforwaterisabout
n=4/3.Whathappenstolightwhenittravelsfromairintowater?答案:Itsspeeddecreasesto3c/4
anditswavelengthdecreasesbyafactorof3/4.3、Arayoflightindiamond(indexofrefraction2.42)isincidentonaninterfacewithair.Whereisthelargestangletheraycanmakewiththenormalandnotbetotallyreflectedbackintothediamond?答案:24.404、Apolarizerandananalyzerareorientedsothatthemaximumamountoflightistransmitted.ThenaturallightofintensityI
isincidentonthepolarizer.Whentheanalyzerisrotatedthrough45.00,whichistheintensityofthelightthroughtheanalyzer.答案:0.25I5、UnpolarizedlightofintensityI
isincidentuponthreepolarizers.Thetransmissionaxisofthefirstpolarizerisalongthez
-axis,thatofthesecondpolarizeris30°rotatedthrough
fromthe
z-axis,andthatofthethirdpolarizerisrotatedinthesamedirectionthrough75°
fromthez-axis.Whatisthelightintensityafterthelightbeampassesthroughthethirdpolarizer?答案:3I
/166、Aparallelbeamofunpolarizedlightinairisincidentatanangleof
54.5°(withrespecttothenormal)onaplaneglasssurface.Thereflectedlightiscompletelylinearlypolarized.Whatistheangleofrefracti
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