ࡱ > q` R F: bjbjqPqP v : : j9 j9 j9 8 9 \ 9 L " Y H V: N ; ; ; ; :E :E :E Y Y Y Y Y Y Y $ Z h g] DY - J C N :E J J DY ; ; H qY JW JW JW J ; ; Y JW J Y JW JW JW ; J: * j9 S JW W Y 0 Y JW s^ T r s^ JW JW s^ ^W , :E E | JW dF d F L :E :E :E DY DY ,V :E :E :E Y J J J J " " " ! " " " ! 4 " ,gDeegnN 0Ni_YeQ0h t t p : / / w w w . 7 c a i e d u . c n ؚ Nirt NQg+gxKmՋ ir t Ջ 2 0 0 9 1 ,gՋnR1 0 0 RՋe9 0 R0T{Hh N_Q(WT{wSu N N0 b,gl 0 \qQ4 0 R0(Wk\~QvV*N y-N gv\S g N*N ycknx gv\ gY*N ycknxhQ [v_4 R NhQv_2 R g b NT{v_0 R 1 NR gsQ`'`'Y\vS-Ncknxv/f A irSOߍcbviddR'YvQ`'`1\'Y B irSO@bSvTR'YvQ`'`1\'Y C irSOv(ϑ'YvQ`'`1\'Y D irSOv^'YvQ`'`1\'Y 2 NRV-Nh:yirSOZP SQv~ЏRvv Nt Vav/f 3 NRlcknxv/f A SOdЏRXTSKbcOOUS`g T(Wzz-N NReYN1Y͑r` B f^ЏRXT(Wzz-N NGSTN=Ǐz-NYN1Y͑r` C >N͑ЏRXT(W>Nw`gÔT NRvkeQYN͑r` D 8nlЏRXTNgS(W4lbYbk NReYN1Y͑r` 4 g$N*NqQpRF 1 = 2 N F 2 = 4 N [NvTRF v'Y\S/f A 1 N B 3 N C 5 N D 7 N 5 NRlcknxv/f A R^'Y^ N['Y B ^v9eSϑ'YR^1\ N['Y C irSO gR^^1\ N[X'Y D ^_'YvirSOvQR^SN_\ 6 YV@b:yA 0B 0C N*NirSOS>e(W4ls^Lhb N(WA v NbQR N*NzvTNv\O(uRRB S0Rv\O(uRv*Npe:N A 1 B 2 C 3 D 4 7 NirSONy0Wb8 0 m ؚv0We1uN=irSON=2 0 m T1uNS0RvQNYRc@wZP SЏRRirSO(Wzz-NЏRv;`e:Ng Sl 0 m / s 2 A 4 s B 4 . 5 s C 5 s D 6 s 8 NR$N*N[-NSOsQvqQTvirt``el/f A gPl B >e'Yl C c6RSϑl D I{HefNl 9 N*NirSO(WQ*NRv\O(uNZP Sv~ЏRS_lN^eTvSv N*NRnQ\esQNirSOvЏR`QNRlcknxv/f A irSOvR^nX'Y B irSOv^nX'Y C irSOvR^nQ\ D irSOv^nQ\ 1 0 YV@b:yA NB $N*NirSO(u{~vޏTǏIQnv[nnA irSO(WQ MOneYNYbkr`\A irSOy0RP MOnN6qYYNYbkr`RA irSO1uQ y0RP T\O(uNA irSO NvR-NX'Yv/f A 0Wb[A viddR B 0Wb[A v/ecR C ~P[[A vbR D A S0Rv͑R N0kXzzN\OVqQ2 8 R0bT{HhkX(W-Nv*j~ Nb cvBl\OT{ 1 1 3 R Ngޘ:gwޘe(WэS NRnL]wޘ:gv(ϑ/f1 . 0 l 0 4 k g @bSvT R:N2 . 0 1 0 3 N ُgޘ:gnLvR^:N_ _ _ _ _ _ _ _ _ _ _ _ _ m / s 2 1 2 5 R N9h9_'|S:N1 0 c m (WNbc͑:N4 N virSOe9_'|v^:N1 2 c m RS_(W[Nbc N͑:N3 N virSOe9_'|v^:N_ _ _ _ _ _ c m GP9_'|GW(W9_'`P^Q 1 3 6 R YV@b:y:NOzvv5u~Fg3z[(W5u~Fg NRN$N9hb~A B TA C $N~NFgqQbk9hb~vbR/f4 0 0 N $N9hb~N4ls^0Wbv9Y҉/f6 0 R$Nb~bRvTR'Y\:N_ _ _ _ _ _ N eT:N_ _ _ _ _ _ _ 1 4 6 R (W xvz SSv~ЏR v[-N]w5unvs:N5 0 H z ~&^vU_YV@b:yv$N*Npep g4 *Np*g;uQRD [^v^:N_ _ _ _ _ _ _ _ _ m s irSOЏRvR^:N_ _ _ _ _ _ _ _ _ _ m s 0 1 5 8 R gTf[(WcvzR^a NRF SR^a NirSOv(ϑm vsQ|e(WOcirSOv(ϑm birSO@bSTYRF NSv`QNR+RKmQNh@bRQv$N~penc0 h NOcirSOv(ϑ NS hNOcirSO@bSTYR NS !kpe 1 2 3 4 5 6 !kpe 1 2 3 4 5 6 a / ( m s - 2 ) 0 . 1 3 0 . 2 5 0 . 3 6 0 . 4 9 0 . 6 1 0 . 7 5 a / ( m s - 2 ) 0 . 2 0 0 . 2 4 0 . 4 1 0 . 5 0 0 . 7 9 1 . 0 0 F / N 0 . 4 9 0 . 9 8 1 . 4 7 1 . 9 6 2 . 4 5 2 . 9 4 e q \ f ( 1 , m ) / k g - 1 1 . 0 0 1 . 2 5 2 . 0 0 2 . 5 0 4 . 0 0 F N R ^ ` b f h l n r t v H J X Z n p t x 6 B ` d P \ ý j h!6 Uh!6 5aJ o( h!6 aJ o( h!6 aJ h!6 5CJ aJ h!6 5CJ aJ o( h9 5CJ aJ o( h9 h9 5CJ aJ o( h!6 5B*CJ aJ o(ph A F ` v v 8 b R d\ gd!6 $d\ a$gd!6 $a$gd!6 $a$gd!6 : D: \ " $ & H J " $ & ( J P \ ^ ` b d f 4 6 < L T p v j h!6 U$h9 h!6 B*aJ mHo(ph sH h9 h!6 aJ mHo(sHh9 h!6 aJ mHsH h!6 H*aJ h!6 aJ h!6 aJ o( G $ L N : H t .dH WD^ `.gd!6 ;dH WD `;gd!6 dH gd!6 d\ WD `gd!6 d\ gd!6 > @ J x h p r z & ( . 0 H J R T r t z | h!6 h!6 B*aJ o(ph j h!6 U h!6 aJ o( h!6 H*aJ h!6 aJ S P \ r v x z | ;dH WDj^;`gd!6 \dH WD8^`\gd!6 dH WDd ` gd!6 dH gd!6 " N T X Z $ 4 8 N X Z \ p t * 2 P T V p ~ ( < > @ T j l n p r t h!6 OJ QJ aJ o(j h!6 U h!6 H*aJ h!6 aJ h!6 aJ o(h!6 5aJ o(R 4 \ z | ^ ` . . . . . <. F. H. P. R. j. l. t. v. x. ǸǸ j h!6 Uj h!6 UaJ Uh!6 CJ H*aJ j h!6 CJ UaJ h!6 CJ H*OJ QJ aJ o( h!6 CJ OJ QJ aJ o(h!6 CJ KH OJ QJ aJ h!6 CJ aJ h!6 CJ aJ o( h!6 aJ o( h!6 aJ 8| | FfT dH $If l ;dH WD `;gd!6 dH gd!6 " , 6 @ J T ^ ` h r | . $If l Ff dH $If l 5 . 0 0 1 Ջ9hncُNpenc(WV2u0YN-NR+R\OQv^v0a F 0a - e q \ f ( 1 , m ) NVa 2 `$1uVa2uS_0Rv~/f_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ a$1uVaYNS_0Rv~/f_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 0 N0{qQ3 2 R0{^QQ_veW[f0ez_T͑o{ekSQQ gTT{Hhv N_R0 gpe