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"[a 156ec8aac122bd4f6e Pp4KSKS5>> >"t>|AS $hH:/ u/;V=w  irtՋ N0 b(,gqQ8\(Wk\~QvV*N y-N gvS g *N ycknx gv gY*N ycknx hQ [v_6R [FO NhQv_3R g v_0R) 14N N/f$N*N8hS^e z`$ EMBED Equation.3 a$ EMBED Equation.3  vQ-Na b:NN*NbY*N|P[0sQN N$N*Ne z NRlcknxv/f Aa:N HYPERLINK "http://www.7caiedu.cn/"  EMBED Equation.3  S^`$ N/fˆS Ba:N HYPERLINK "http://www.7caiedu.cn/"  EMBED Equation.3  S^`$/fˆS Cb:N HYPERLINK "http://www.7caiedu.cn/"  EMBED Equation.3 S^a$ N/fZS Db:N HYPERLINK "http://www.7caiedu.cn/"  EMBED Equation.3  S^a$/fZS 15Ye[̑veIQop{SQgTv}vIQ0sQN}vIQNu:gtvl cknxv/f A}vIQ/f1uop{QopN[5u Nuv B}vIQ/f1uop{QlSO[5u Nuv C}vIQ/f1uop{QXgIQir(YB\5uP[SoS Nuv D}vIQ/f1uop{QXgIQir(QB\5uP[SoS Nuv 16sQN ^yNS }N*)Yޘ9T ΘNNS la TekkSf NRlcknxv/f A[NSЏL(W0WtdS Nzz B ^yNS wQ gf'YvR^ C ΘNNS wQ gf'Yv^ D ΘNNS wQ gfwvЏLhTg 17girSO1uYbk_YZPSRv~ЏR R^anQ\ ~etirSOv^S:Nv RirSO(WteQvMOys0 NRlcknxv/f A EMBED Equation.3  B EMBED Equation.3  C EMBED Equation.3  Del$Re0 18 NRlcknxv/f AirSO>eQpϑ )n^ NN[MNO BirSOQXR )n^N[GSؚ CpϑSvNNO)nirSO O~ؚ)nirSO DpϑSvNؚ)nirSO O~NO)nirSO 19YV@b:y A:N&^5uϑ:NQvWb_ё^\g(V-NAg:NOƉV) B:N(ϑ:Nm05uwϑ'Y\:Nqv&^5u\t (u~N~`cNOp0\t1uN5u:WR Ybk(WǏё^\g-N_NWvNё^\sbvv~ Nݍg:NrvMOn `~NzveTv9Y҉:NsQN\t@b(WMOnYv:W:_ NRl-Ncknxv/f A\t@b(WMOnY:W:_'Y\:NkQ/r2 eT4ls^TS B\t@b(WMOnY:W:_'Y\:NkQ/r2 eT4ls^T] C\t@b(WMOnY:W:_'Y\:Nmgtan/q eT4ls^T] D\t@b(WMOnY:W:_'Y\:Nmgtan/q eT4ls^TS 20YV@b:y g:Svё^\WsNgݍ:Ndvs^Lg5u[hVv$Ngg qc(WNw ё^\sSO gNWv~bTYvS:_x:W sOё^\sNR`[ NSvsvTSЏR1ux:WYۏeQx:W (Wё^\sۏeQx:WvǏ z-N 5u[hV&^5uϑQetSSv['`Va^:N 21YV@b:y 9_'|vNzV[(WzvX N (ϑ:NmvIQn'_b_iYbk(WIQn4ls^b N ^N4ls^bs^nޏc N*N(ϑ_N:Nmv\tNiؚhY_Y Nn A(WNTvЏRǏ z-N \tTivRϑY~[R` B(W NnǏ z-N\tTiKNvvN\O(uRY~ZPR C9_'|S9_T \tTiZPs NSvv~ЏR D9_'|S9_T \tTiv:gh[R` \tV0RiؚhY  [[SN-N2009~,{mQg2ggՋirtՋT{aS N0 bqQ8\(Wk\~QvV*N y-N gN*NbN*NN N y&{TvBl hQ [_6R NhQ_3R g b NT{v_0R S1415161718192021T{Hh,{a!wS^ b qQ72R N0[0bT{HhkX(W-Nv*j~ Nb cvBl\OT{0 220(18R)[ (1)6R g Tf[(WZP (ull0OKmRP['Y\ v[-N {QvRP[v_~gf>fOP'Y S/f1uN( ) Alxeg[hQce_ Blx-N+T g'YϑR| C{lbye SN@b g NNeApY Te O&^Na0=2m/s2vR^RЏl ]wirWWN O&^vnRiddVpe:N0.4 Bl\irWW1uAzЏRBz@b~Sve0 240(18R) YV@b:y ABC:NIQnhS vQ-NABk4ls^>en BCk:NJS_RvW'_ ABNBCvRNBp0AY gNzvXb N{9_'|vNzV[NX N SNzNN(ϑ:NMvirWWvޏc S_9_'|YNSr`e irWWp`NV[(WX NvLb_!cgvc扎NBYFOe$cS0sON(ϑ:Nmv\tNW'_hS Nݍ4ls^hSؚhYvDp1uYbk_Y Nn0\tNirWWvxTzsSqQFO N|ޏ irWWNLb_!cgvxT^zsSQ:N_N N|ޏ0(te*NǏ z-N 9_'|l gǏ9_'`P^0 Nzzl;R ͑RR^:Ng) (1) ՋBl9_'|_vg'Y9_'`R (2) Bl\tNirWW,{N!kxTlBC NGSvg'Yؚ (3) R>>h0k!kN\tcirWWirWWdQLb_!cgSeGW:N%t R\t1uDpQS~Ye,{ N!kǏBp? 250(20R)(WxOys^bQ x>0v:SWX[(WWv~bT̑vS:_x:W xa^:_^:NB=0.4T x < 0v:SWX[(WlxtckeTvS:_5u:W0s gN(ϑ:Nm = 4.010 9kg &^5uϑ:N q = 2.010 7 Cvck|P[NxtckeT NvMpN^v0=20m/sۏeQx:W YV@b:y v0NxtckeTv9Y҉=45 MpNOpvݍ:Nl= HYPERLINK "http://www.7caiedu.cn/"  EMBED Equation.3 m0]w|P[Nl@wyteTv^WvzǏxtJSt NvNp N|P[͑R0Bl (1) |P[zǏytckJStvMOnNSzǏytckJSte^Nytv9Y҉ (2) x<0:SW5u:Wv:W:_ (3) Ջ|P[&T~ǏPWhSpO? N fSV BlQ|P[NMpЏR0RNp@b~Sve0 ST{Hhirt N0 b(qQ48R) 140B 150C 160B 170C 180AD 190C 200C 210BC 220[qQ18R 1 AC (6R) 2 `$YN 4R a$A cYNVޏc}Y[5uBTs10s2 N5uShvpeU1CQe_s2 N5uShvpeU2 4R ByTCyekT2R b$ EMBED Equation.3  4R 2316R irWWR>e N O&^e 1u[r,{N[_ mgma& & & & & & & & & & & & & &  eq \o\ac(%,1) 2R _a4m/s2& & & & & & & & & & & & &  eq \o\ac(%,2) irWWSet1TN O&^qQ R at1v0 a0t1& & & & & & & & & & & & &  eq \o\ac(%,3) 2R _t11s& & & & & & & & & & & & & &  eq \o\ac(%,4) 1R dkǏ z-NirWWvMOy:N s1at12/2& & & & & & & & & & & & & &  eq \o\ac(%,5) 2R _s12m<s=7m& & & & & & & & & &  eq \o\ac(%,6) 2R EeirSOdke\*g0RBp NdkTvǏ z-N1uNa0<g irWW\T O&^NqQ TvR^ЏR SSet20RBp R 2R s s1at1t2 a0t22/2& & & & & & & & & &  eq \o\ac(%,7) 2R _t21s& & & & & & & & & & & & & &  eq \o\ac(%,8) 1R irSONA0RBSett1 t22s& & & &  eq \o\ac(%,9) 2R vQ[lL`~R 24018R 1 \tЏR,{N!kxMR mghmv02/2& & & & & & & & & & & & & & & & &  eq \o\ac(%,1) 2R xdǏ z Rϑ[R` mv0M m v1& & & & & & & & & & & & & & & &  eq \o\ac(%,2) 2R xTS)9_'|Ǐ z-N M0mS9_'||~:gh[R` EpmM m v12/2& & & & & & & & & & & & & &  eq \o\ac(%,3) 2R 1u eq \o\ac(%,1)0 eq \o\ac(%,2)0 eq \o\ac(%,3)Tz㉗_ Epm HYPERLINK "http://www.7caiedu.cn/"  EMBED Equation.3 & & & & & & & & & & & & & & & &  eq \o\ac(%,4) 2R 2 ,{N!kxT\tTBChSЏRvR^sS:Nv1 1u:gh[R`_  HYPERLINK "http://www.7caiedu.cn/"  EMBED Equation.3 & & & & & & & & & & & & & & & &  eq \o\ac(%,5) 2R 1u eq \o\ac(%,1)0 eq \o\ac(%,2)0 eq \o\ac(%,5)Tz㉗_ HYPERLINK "http://www.7caiedu.cn/"  EMBED Equation.3 & & & &  eq \o\ac(%,6) 2R 3 \t(WBCkЏRSI{He:NUSFd vQhTg:N T HYPERLINK "http://www.7caiedu.cn/"  EMBED Equation.3 & & & & & & & & & & & & & & & & & &  eq \o\ac(%,7) 2R Rg_\t,{ N!kǏBpSe:N t HYPERLINK "http://www.7caiedu.cn/"  EMBED Equation.3 & & & & & & & & & & & & & & & & &  eq \o\ac(%,8) 2R 1u eq \o\ac(%,7) eq \o\ac(%,8)Tz㉗_t HYPERLINK "http://www.7caiedu.cn/"  EMBED Equation.3 & & & & & & &  eq \o\ac(%,9) 2R 25020R 1 |P[(Wx:W-NЏRe 1umNyQRcOT_R Bqv0mv02/R& & & & & & & & & & & & & & & & 2R _R1m ǏMpZPR^v0vW~NytckeTNPp RPMl/cos450 _PM2m2R& & & & & & & & & & & & & & 1R 1uQUOsQ|_PM:NhWv_ PpsS:N|P[zǏytckJStvMOn OPPM sin450 HYPERLINK "http://www.7caiedu.cn/"  EMBED Equation.3 m& & & & & & & & & & & 2R 1uWv[y'`_dkY^Nyt9Y҉:N450& & & & & & 2R 2 |P[1uPp0RNpSet1 R xeTv0sin450 Eqt1/m0& & & & & & & & & & & & & & 2R yeTv0t1cos450OP& & & & & & & & & & & & & & & & 2R TzBl NeQpenc_t10.1s E2 HYPERLINK "http://www.7caiedu.cn/"  EMBED Equation.3 V/mH"2.82 V/m& 2R 3 |P[0ROp& & & & & & & & & & & & & & & & & & & 1R |P[(Wx:W-NvЏRhTg:NT2m/Bq& & & & & & & & 2R NMpЏR0ROp~ǏvhYVeu ~Sve:NtT/2+3T/4+2t1& & & & & & & & & & & & 2R NeQpenc_t(/8+0.2)sH"0.59s& & & & & & & & & & & 2R V A 2u S1 V YN S1 S2 R V A N S1 R ! 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