【十万火急～!高分悬赏大学英文的物理练习题..1.A"secondspendulum"isonethatmovesthroughitsequilibriumpositiononceeachsecond.(Theperiodofthependulumisprecisely2.000s.)Thelengthofasecondspendulumis0.9930m】

　　十万火急～!高分悬赏大学英文的物理练习题..

　　1.A"secondspendulum"isonethatmovesthroughitsequilibriumpositiononceeachsecond.(Theperiodofthependulumisprecisely2.000s.)Thelengthofasecondspendulumis0.9930matTokyoand0.9942matCambridge,England.Whatistheratioofthefree-fallaccelerationsatthesetwolocations?

　　(gCambridge/gTokyo)=_____

　　2.Thepositionofaparticleisgivenbytheexpressionx=6.00cos(2.00πt+π/4),wherexisinmetersandtisinseconds.

　　(a)Determinethefrequency.

　　_______Hz

　　(b)Determineperiodofthemotion.

　　________s

　　(c)Determinetheamplitudeofthemotion.

　　________m

　　(d)Determinethephaseconstant.

　　_______rad

　　(e)Determinethepositionoftheparticleatt=0.290s.

　　________m

　　4.AblockofmassMhangsfromarubbercord.Theblockissupportedsothatthecordisnotstretched.TheunstretchedlengthofthecordisL0,anditsmassism,muchlessthanM.The"springconstant"forthecordisk.Theblockisreleasedandstopsmomentarilyatthelowestpoint.

　　(a)Determinethetensioninthestringwhentheblockisatthislowestpoint.(Usethefollowingvariablesasnecessary:L_0forL0,m,M,andg.)

　　T=________

　　(b)Whatisthelengthofthecordinthis"stretched"position?(Usethefollowingvariablesasnecessary:L_0forL0,k,m,M,andg.)

　　L=_______

　　(c)Iftheblockisheldinthislowestposition,findthespeedofatransversewaveinthecord.(Usethefollowingvariablesasnecessary:L_0forL0,k,m,M,andg.)

　　v=________

　　5.Apianostringhavingamassperunitlengthequalto4.8010-3kg/misunderatensionof1250N.Findthespeedwithwhichawavetravelsonthisstring.

　　______m/s

　　7.Ablock–springsystemvibratingonafrictionless,horizontalsurfacewithanamplitudeof2.0cmhasanenergyof10J.Iftheblockisreplacedbyonewhosemassistwicethemassoftheoriginalblockandtheamplitudeofthemotionisagain2.0cm,whatistheenergyofthesystem?

　　______J

　　8.Amass–springsystemmoveswithsimpleharmonicmotionalongthexaxisbetweenturningpointsatx1=19cmandx2=81cm.

　　(i)Atwhichpos