模拟练习题一

《模拟练习题一》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、F(R)4.Whatis模拟练习题一F2(R)(A)32(B)8i(kx−ωt)(C)41.Thewavefunctionofaparticleise,where(D)2xisdistance,tistime,andkandωare(E)1positiverealnumbers.Thex-componentofthemomentumoftheparticleis5.SupposethereisaverysmallshaftintheEarthsuch(A)0thatthepointmasscanbeplacedataradiusofR/2.(B)hωF(R)(C)hkWhati

2、shω⎛R⎞(D)F⎜⎟c⎝2⎠hk(E)(A)8ω(B)4(C)22.Thelongestwavelengthx-raythatcanundergo1Braggdiffractioninacrystalforagivenfamilyof(D)2planesofspacingdis1d(E)(A)44d(B)2M(C)d(D)2dmm(E)4d454545456.Twowedges,eachofmassm,areplacednextto3.TheratioofenergiesoftheKcharacteristicx-rayseachotheronaflatfloor.

3、AcubeofmassMisofcarbon(Z=6)tothoseofmagnesium(Z=19)isbalancedonthewedgesasshownabove.Assumeonmostnearlyfrictionbetweenthecubeandthewedges,buta1(A)coefficientofstaticfrictionμ<1betweenthewedges4andthefloor.WhatisthelargestMthatcanbe1(B)balancedasshownwithoutmotionofthewedges?2(C)1m(A)(D)22(E)

4、4μm(B)Questions4-52ThemagnitudeoftheEarth’sgravitationalforceonapointmassisF(r),whereristhedistancefromtheμm(C)Earth’scentertothepointmass.AssuretheEarthis1−μhomogeneoussphereofradiusR.12μmz(D)1−μ(E)AllMwillbalance.MkˆyOˆjlliˆcmmxb7.AcylindricaltubeofmassMcanslideonahorizontalwire.Twoidentic

5、alpendulums,eachof8.Asolidconehangsfromafrictionlesspivotatthemassmandlengthl,hangfromtheendsofthetube,originO,asshownabove.Ifiˆ,ˆj,kˆareunitasshownabove.Forsmalloscillationsofthependulumsintheplaneofthepaper,thevectors,anda,b,andcarepositiveconstants,whicheigenfrequenciesofthenormalmodesofo

6、scillationofofthefollowingforcesFappliedtotherimoftheconeatapointPresultsinatorqueτontheconewithg(M+2m)thissystemare0,,andanegativecomponentτz?lM(A)F=kaˆ,Pis(0,b,−c)g(A)l(B)F=−kaˆ,Pis(0,−b,−c)gM+m(C)F=ˆja,Pis(−b,0,−c)(B)lM(D)F=ˆja,Pis(b,0,−c)gm(C)lM(E)F=−kaˆ,Pis(−b,0,−c)gm(D)lM+mgm(E)lM+2m22

7、1q(A)24πεa02i13qa(B)bi4πε2a202c12q(C)24πεa0213q(D)24πεa0rP217q9.Acoaxialcablehavingradiia,bandccarriesequal(E)24πε2aandoppositecurrentsofmagnitudeiontheinnerand0outerconductors.WhatisthemagnitudeofthemagneticinductionatpointPoutsideofthecableatdist