09大学物理I练习册(力学)练习题评讲

1、 xdxvdt22xxdvd xadtdt dxdtxvxvt120.50.5xxxvv3,tdvadt223 (/)tm s003vttdva dtt,3 ;vt2,nvardsvdt20.3 ,t1030(/ )tvm s22450(/)nvam sr2450(/)m s3dvdt222cos,xd xartdt 222sin,yd yartdt 220zd zadt22(cos)(sin)rt irt jv dxdt5(/ )m s22dvd xdtdt25 123 ,tt(0)5(/ )vm s126 , t0a 2t (2)17 (/ )vm s17 (/ )m sddt24.8/m

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mm2,000rrfrmfw020mrfw sinrmv jpr