09大学物理I练习册练习题评讲ppt课件

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2、 stdvadt212 ,t21.2vrt2.4 , t24.8/tam s2t 222 212.4(2.4 )0.1 (12 ) ,2tttt3.15rad1/61/12 3.15rad(sincos)RtitjcossinrRtiRtjv dvdtv drdt(sincos)Rtitj vR32m23262xttx(4)(0)xxdxdtv 2126ttS (2)(0)xx(4)(2)xx48m12 12dvatdt(4)48/ ,vm s 2(4)36/am s 219.00.5yx22.019.02.0 rtitjx 2.0 , t(2)(1)rrv 219.02.0yt2.06.0i

3、jv drdt2.04.0itjv 24.0 16.0,t11ttdvadt12.04.0 ,tvij3.58 ,2211nttaaa n1.79 , na dvdt4.0 j 21ntva11.7( ),m2 1220.25yx22(2)rtitjx 2 , t(2)(0)rrr 22yt44ijr 202rr(0)r2 , j(2)r42ij(2)(0)rr2.47 m18.0/m s21030 xtt xv dxdt1060 , t xxdvadt21520yttyv dydt1540 , t22(0)(0)(0)xyvvvtan( 1.5)arc123 4160,40yydvadt 2

4、72.1/m s22xyaaatan( 2/3)arc33 41 24ata v 31143vtt adtcdvdt2410.752( )12xtttm v ,dxdt3143ttcx 31( 1 4)3tt dtc 2(4)tdtc2420() /bvbtR22naaRv2dtdva na2021bttvsav,baarctan(/)naatsdtdsbtv 0bv /0201,2vbN2sR204vbR20arctan () /()vbtRb64aij010riavddtavd64vtitjrrrd0221032rit it jdtrdv0t0vdta0(64 )ttitj dtdtvd2

5、2(103 )2rtit j3220yxv (2)4.0/vm sr2ct230(2/3)ttt20.5ct10.5s22 0.50.50.5ttdvadt21.0/m s222,()vaar21.01/m sddt22 ,t22,dt dt5.33rad31.05 10 su,xxxvvu,xxvvyyyvvu0.55yv 01.10sinyv uvvt /xL v31.00 101.10cos3031.05 10 su,xxvv0.55yv 01.10sinyv uvvt /xL v31.00 101.10cos30t /xL v31.00 10,1.10cos500m y minut12

6、,fM gM a11,fM gM a21/ ,FFaa12/,aM g Mag 21/ ,FFaa112() ,FMMa212() ,FMMa11Ffm a22fFm a20TF0ATf0Ff0fmg2Amgfmgma0Bmgfmamaxcossinmgmgmacossingg2( )()F rNdm r( )F rNr2( )mdF rrdrl200( )llmdF rrdrl21(0)2Flm52.79 10 ()N()F rdr2vNmR21dvdtvR 0201()vtvdvdtvR00RvvRvtdvNmdt2dvvdtR 0Rtv21dvdtvR 0201()vtvdvdtvR00

7、RvvRvt2dvvdtR 0Rtv00RvdsvdtRvtln2R0000RvRv dtsRvt00()vtvtdvdtm20,2tvvmdvmtdt 467m1030/ ,tvm s20,2dxtvvdtm210000()2txxvdtm0,mvmV2211,22mvmVmgR2vvVv 0 xxWFdx22011,22Wmvmv100(25).xdxyINtmgN)(0()mv 2,mghmgt2,mghmgt2mgh2kr2vmr212kEmvr/()vkmr2rkFer rWFdr/()kmrkr ()pprEE ,prkEr /(2 )kr2()rkdrr1W Fr3 128 (

8、3) 12 J12 J12kWWE 2W 12 J204.252 (1)vhmgctg(cos)sinhmg1/22(1)8.16/vghctgm s2(cos)sinhmg2012mghmv2201122mvmvdWmgdy882 J(100.2 )y gdyWdW100(100.2 )y gdymv25mvglm12vmm v 221211222m vm glm v22vmm glfW 43n 220011222vmmv2 mg rn2038mv 2fWmg r 20316vrg20102mv222211 1()22 2mgRmRMR2211(1 cos )2mgLmL2221 1(1 c

9、os )()22 3LmgmL22012122llmvmlm0外Mm1 1mRvFW2v22mR v2212mv2211221(1)2RmvR112RvR2112mv1 12/RvR22211212(/1)mvRR TRa 212MRR12TMa/2MaMM 2lmg19MM /9M/332mlg22112122LMLm 22001212MLmr 22222100(24)/(6)MLmrMLmL2222100(24)/(6)MLmrMLmL111,m gTm a12156,118TNTN222Tm gm a21231,2fTrT rMm r,ar合外McJM dcJdtddtJc1001,tc

10、dtdJtJce0001,tcdtdJtJce02lncJt tJcedtd000ln2(1),2ctJJtcJJecc04JNc01l2l)(21llF1Nl0Nr)(2mr)(21llF1Nl0Nr)(2mrt0023.14 10FNvmvRvuv Rv JmRRvm2srad /1052. 92J0sin602lmg212J0,MJ21cos60 /()23lmgml218.4s17.98s212KEJ0.98 J2lmg212J0,18.57s12,JJ1212,?a a T T RT11a2arR)2() 1 (1m2m1111amTgm2222amgmTrT212()JJRr12221212(),m Rm r gJJm Rm r1a12221212(),m Rm r gRJJm Rm r2122211221212(),JJm rm Rr m gTJJm Rm r0外Mm2,000rrFrmFW020mrFWsinrmvJprrp2mr