搜索
2579111417212427303439434851/56:1ABCDBC22010IABCDA3ABCDBCD4abcdL=1macs=20mabcdv=20m/sababcdabv=20m/s2Lt=2L/v=0.1sbacd:,1ABCDD22009ABCDDD32010IABCDD:(1)22m/s(2)1ABCDBC2A2s3sB3s3sC3s2sD1s1sA:123ABCABC4-14-1ACBABS4O50m1ABCDBCD212m20m6mA2m10mB38m10mC14m6mD38m6m1ABCD2ABCD3RACA00B4R2RC4R4RD4R2R4R3A2R2RB2R6RC2R2RD06RBACBCAstt0O54A8m4mB2m8mC4m3mD3m4m6R1.75A3.5RB2RC3.5R2RD0.5R2R7400m1A400m400mB400m0C0400mD0082008rabA00B2rrCrrD2r2r9OAAssBvvCy-xv-tDy-xs-t10ABCs-t0t0AABCCD11abcAE??abr:12tsv()()3()4()561ABCDAC2v1=10m/sv2=15m/ssv=212121212//22vvvvvsvsstts=12m/sv=(v0+vt)/23oxoxx=5+2t3(m)v=6t2(m/s)t=0t=2st=2st=3st=0x0=5mt=2sx2=21mt=3sx3=59m:t=0t=2s2021xxv=8m/st=2st=3s1232xxv=38m/s:1()2a=tvvtvt0m/s234VVa56()7avav8aavavav91()ABCDD()22m/s21s()A2B2m/sC1s2m/sD1s2m/s2m/s2()2m/s2m/s21s1s1s2s2m/s21s4m/s3v1=4m/s1sv2=10m/s1stvvat0v0=4m/st=1sv2v114101a=6m/s2v2v114102a=-14m/s2v1v212-(s-t)-(v-t)3()4S-tv-tS-tv-t(v)tls1(a)t1v1(Ot1)113s236s13s6m/s2at22/1/639smsma3attmmS36)39(62163[]--220091A0-2s1m/s2B0-5s10mC1s3sD1s5sACv-t0-2s1m/s20-5s7m1s3s5s[]-vm/st/s12345201120221gthv=gt3gg=9.8m/s24stvt5135(:1).....23(:)1213mg=10m/s2212sgt22151.7310stssg101.73/17.3/tvgtmsms[]21.5km8m/s221gtsgtvttsmsmgsvt/10732.1/105.1102223[](1)()(2)a=a=ava=av(3)vt=v0+atS=vot+at2(4)vt2v02=2asaa2/02ttvvvvs=tvvt20vs/2=SSSaT2=51s2s3sns123n1s2s3sns122232n21s2s3sns135(2n-1);1(123n6.1ABAa11.0m/s2Ba22.0m/s2ABABABCDABAAB2nssAsn22B22nsC122nsD122nsCa(n1)ssn121a(n1)2nssn21an2nsssnsn121an221a(n1)2sa122nsO5ABCDs1s2s3(1)vTssvc232(T=50.02s=0.1s(2)a23216549Tssssssa(3)a223Tssa(4)v-taABCDEFv-tat/s0T2T3T4T5T6Tv/(ms-1)BCDs1s2s3A(5)a()b()(50Hz0.02s5)5c()()150Hz012345601350d1d2d3cm2v2=______m/s.a=______m/s2.d1=1.20cmd2=5.40cmd3=12.00cmv2=0.21m/sa=0.60m/s21202ttvvtSvt0v,tvaatvv022202tavvtavvttt202ttvvv222202tsvvvS0v,tvaasvvt220222222222022SavvSavvsts22202tsvvv3,t1S2S3SnSa,2312SSSSS21atSSnn0vtatvv0120121attvStatvv022202122321attvattvStatvv023202232521attvattvSntatnvvn0202121221atntvattvSnn2312SSSSS21atSSnna2tSaSta4t2t3tnt1S2S3SnS=1492n00va221atSt2t3tnt2121atS22)2(21taS23)3(21taS2)(21ntaSn1S2S3SnS=1492n5,11S2S3SnS=135(2n-1)1t2t3tnt321SSSnS1t2121atS2t22222321)2(21atattaS3t222325)2(21)3(21attataSnt222212])1[(21)(21atntnantaSn)12(:5:3:1::::321nSSSSn6,1t2t3tnt=1(12)(23)(1nn)SSSnS321tttnt,221atSaSt21aSaSaSt2)12(242aSaSaSt2)23(463aSnnaSnanStn2)1()1(22)1(:)23(:)12(:1::321nnttttn13.51231A2B3CD3.570.5D70.5135791113SCB:SBA:SAO=8:16:2412,3SOASOBSOC=244048=356212561t2t3tnt=1(12)(23)(1nn)561262tt)(58.2512566St3ABtABavbvAB1v2t2vA.1v2vB.1v2vC.1v2vD.2v1v1v21baABvvvv2v2222bavvv22224)(2222222222222babbaabbaababavvvvvvvvvvvvvvv1vbavv2v1vD1.=+2.3.4./123456G=mg78910111213f=kx1(1)(2).(3)(4)2_3F1F2F1=F2N4(1)(2)5(1)(2)61,2G=mggg9.8219.8345mg=GMm/R2mg71()2()3F=kx,kxLLox=|L-L0|xL241()ABCDBD2ABCDAB()C3GABGAN1BN2ON1N2GGNGN1NTABGNGN4ABAAAC5mFAF=mgsinBF=mgcosCaF=ma/sinDa22)()(mgmaF)/arctan(gamgamgFmaFcossinga/tantangasin/maFamgma22)()(mgmaF)/arctan(gaDBAAAABBBABCDFmgmamamgFf=N1(1)(2)(3)()()2()()()()GNf3(1)()()(2)f=NN,F=N1mv1v2v3??()()Nmgcosf==mgcosf=mgcos2FABF()AAFBAFCADAAFABAABCDAABAFCAD3F1F2F1=10NF2=2NF1A10NB8NC2NDF1AF1F1-F2-f=08NF12NF2F2+f0D1()()12(a)ABN1N2GN1N2O(b)3F1F2F1F2F1F2aF1F2F1F2F1F2Fb21F1F2,cos2212221FFFFF|F1-F2|FF1+F2()2FF1tan=cossin212FFF,090tan=12FF3F1F20-1800FF12004+-312()()F1F2F1F2()341234121F1-F2FF1+F223121m()AmgcosBmgtanCmg/cosDmgFlF2F=mg/cosC2()ABCDF2=Fsin1F2Fsin2F2Fsin3FsinF2F4F2FD12v=0a=0va=00,.:.31F=0Fx=0Fy=02451236123xyxyxy7891Om1m2m1O6021mmA.3/3B.3/2C.2/3D.2/2m2m2T=m2gm1120sin30sin1gmT3/321mmA(1)m1m2(2)2mABmgCDmgBCmmgFN1FN2FN1FN2mgOm1m2m1gTNmgFN1FN21(1)()(2)(3)2(1)(2)()(3)(4)3(1)(2)(3)(4)41()21MmMmMmMgFN1mFN2fMMmmMaMFN2mABCABFBC_________ABC()11ACBFf234521aF2F=mamFaaaa31F=maF2FmamFm3FmaFaFaFaFa4FmaFaaF5Fma6FmaFmkga27Fma4(1)F=ma(2)aFa(3)()FaFxaxFyay(4)F=maFma(5)(,)12F=F/31()ABCDD23?avvavvava(F=mg-kxx)(a=F/m)va(F=kx-mg=ma)Fav4mL1L2L1L2L2T2L1L1L1a=gsin5L14(1)(2)ab()/11()2a2341234562/2,2,21,0202200ttttvvvtsvasvvattvsatvv()Fmg()Fmg()F=0ag7ag12kg6.4N4.2N4s4sF=F-f=6.4-4.2N=2.2NmFa=1.1m/s2v0=04svt=v0+at=at=1.1m/s24s=4.4m/s4s22220)4(/10212121ssmgtgttvs=80m275kgv02m/s30t5ss60m2021attvs2)5(215/260sassmma=4m/s2F=ma=300NNGFNGNGF=Gsin30=750N1/2=375NF=375N-300N=75NGNFfNGFNGFxycosGGYsinGGxNGFXYYN=GyXGxF=300NF=75N32mAmB.FABAB?ABFF2mmaaF3mBAF1F1maF1F34ABCD0C5m=1kg(g=10m/s2)15m/s25m/s235m/s245m/s255m/s2(1)10N(2)15N(3)5N(4)5N(5)15N