1、 1 6 2 6 20192020 1.2.3.120 150 4.12 4 48 18 912 4 2 0 1()A B C D 2 FGm1m2r2()A G B r Cm1 m2 Dm1 m2 m1m2 3()A B C D 4 v ()Avsin B vsin Cvcos Dvcos 5 O 10 m/s v0 45 A g10 m/s2()A1 s B1.5 s C2 s D1.4 s 6 10 m/s 0.9 r()A0.5 B0.6 C0.7 D0.8 7 AB O1O2 rArB rArB vA vB aA aB A B TA TB()AvAvB BAB CaAaB DTATB
2、 8 abc a()A a c B a b C a D b 24 h 9()A B C D 10 O v1 A O v2 B A B()A O A 3 6 4 6 B O A O B 3 Cv1v231 Dv1v221 11 v g()A rv2gtan B C v D v 12 AB O A B M L T()AA B BA B CL M T DM L T 5 52 13(6)“”x ABC x0.4 mh10.1 mh20.5 mg 10 m/s2(1)A B T_s(2)_m/s(3)B _m/s14(9)(O)(1)_(2)_(3)m_15(10)37 m2.0 kg 9 m/s 1.
3、5 s 0.25 R1.2103 km(sin 370.6cos 370.8)(1)g(2)16(12)m1 kg v010 m/s x O y F5 N OA x 37(sin 370.6cos 370.8)(1)OA P O P P(2)P vp x tan 5 6 6 6 17(15)30 v0 vt t0 R G(1)(2)(3)v1 20192020 1A A BC D 2D FGm1m2r2 G A r B m1m2 C D 3C A B()C D 4C(v1)(v2)v1vcos C 5A 45 vyv010 m/svygt t1 sA 6B mg-FNmv2R 10 m/s 2
4、100.9mgmgm R220mgkmgm R k0.6 B 7D vAvB A AB rArBvr AB B av2r r a aAaB C T2 A TATB D 8A GMmr2 m2r GMr3 a c A GMmr2 ma aGMr2 ab B GMmr2 mv2r vGMr a C GMmr2 m42T2 r T2r3GM b 24 hD 9BD A B C D 10BC OA h O A t 2hg 3 A B A O B 2 O A O B 3 B O B x t.3xv1txv2t v1v231 C D 11ABD mgtan mv2r rv2gtan A mgtan mv2
5、r vgrtan B v C D 12BD mAmB RARB GmAmBL2 mA2RAGmAmBL2 mB2RBRARBLmAmBRBRA RARB A B A vARAvBRB RARB A B B T2T2L3GM M L T C D 13(6)(1)0.2 (2)2(3)2.5(1)ygt2210.2hhytggs(2)02xvtm/s(3)B 121.52Byhhvtm/s B 2202.5BByvvvm/s 14(9)(1)(2)F R T (3)224FTR(1)(2)224FmRmaT F R T(3)224FmRmaT m224FTR 15(10)(1)mgsin mgco
6、s ma avt901.5 m/s26 m/s2g7.5 m/s2(2)GMmR2 mgGMmR2 mv2R v gR v3.0103 m/s 16(12)(1)Fmaxv0ty12at2 tan37yx t3 sx30 my22.5 m P 30 m22.5 m(2)P vyat15 m/svP2205 13Byvvvm/s 0tan1.5yvv 17(15)(1)010vat12v0t012v2t0v12v00200=24vvatt(2)a1gsin gcos a2gsin gcos 005=4vgtGMmR2 mg MgR2G3344/3MgGRR 001516 vG Rt(3)21vmgm R01054v Rvt
