Физика-9кл-Перышкин-Гутник-2001-ГДZ (991173), страница 7
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>eyl_eZ,Z fk2^eyl_eZ,,Z fk2.1.>Zght=5cZo fk2v0o dfq fkGZclbsx.2.>Zght = 20 cZo fk2v0o fkGZclbsx.1.>Zghs3 ft1 kGZclb s1, a.2.>Zghs5 ft1 kt5 kMijZ`g_gb_ J_r_gb_sx = v0 o t +axt 22fk ⋅ kfHl\_lsx f0,5 fk 2 ⋅ (5 k )=22J_r_gb_axt 2vv t2 v t; ao = − 0 x ⇒ sx = v0 o t − 0 x = 0 x =2t2t2fk ⋅ k fHl\_lsx fsx = v0 o t +MijZ`g_gb_ J_r_gb_s1 : s2 : s3 = 1 : 3 : 5; s1 : 2 f = 1 : 5 ⇒ s1 = 2 f 5 = 0,4 f;at122s2 ⋅ 0,4 f= 0,8 f/k2.⇒ a = 21 =22t1(1 k)Hl\_ls1 fa fk2.s1 =J_r_gb_s1 : s2 : s3 : s4 : s5 = 1 : 3 : 5 : 7 : 9; s1 : 6,3 f = 1 : 9 ⇒⇒ s1 = 6,3 f 5 = 0,7 f;at122s2 ⋅ 0,7 f= 1,4 f/k2;⇒ a = 21 =2t1(1 k)2v5 = at5 fk2 ⋅ k fkHl\_lv5 fks1 =GZclbv5.41MijZ`g_gb_ 1. fk2. G_l ihkdhevdm b ^_j_\h b \hdaZe `_kldh k\yaZgu k ^jm]hckbkl_fhchlkq_lZ²A_fe_c3.
Ijbmkeh\bbg_ih^\b`ghklbwlbol_ehlghkbl_evgh^jm]^jm]Z4. dfq fk5*.>ZghJ_r_gb_v1 dfq fkv\ = v1 + v2 fk fk fkv2 fkva = v2 – v1 fk ±fk fkGZclbv\, va.Hl\_lv\ fkva fkMijZ`g_gb_ AZdhgbg_jpbb\uihegy_lky\ kbkl_f_hlkq_lZk\yaZgghck A_fe_cb\ kbkl_f_ hlkq_lZ k\yaZgghc k ih_a^hf \h \j_fy _]hijyfhebg_cgh]h b jZ\ghf_jgh]h ^\b`_gby g_ \uihegy_lky \kbkl_f_ hlkq_lZ k\yaZgghc k ih_a^hf \h \j_fy _]h lhjfh`_gbyBg_jpbZevghckbkl_fhcfh`ghkqblZlva_fexZ ih_a^²g_evayMijZ`g_gb_1.>ZghJ_r_gb_Z fk2 IhhfmaZdhgmGvxlhgZm d]F = ma d]⋅ fk2 GGZclbF.Hl\_lF G2.>ZghJ_r_gb_t = 20 cF = ma ²hcaZdhgGvxlhgZv fkvmv 1,84 ⋅ 10 5 d] ⋅ 4 fk5====a⇒Fm l ⋅10 d]20 kttG dGGZclbF.Hl\_lF dG3.>ZghJ_r_gb_IhhfmaZdhgmGvxlhgZm1 = m2a1 fk2 F1 = m1a1; F2 = m2a2. Ldm1 = m2lhihemqZ_fa2 fk2F1 F2a F0,64 fk 2 ⋅ 1,2 G=⇒ F2 = 2 1 == 9,6 H.F1 = 1,2 Ha1 a 2a10,08 fk 2GZclbF2.Hl\_lF2 G424.>Zghm = 0,5 d]FA = 10 HFL = 5 HFC = 2 HJ_r_gb_IhhfmaZdhgmGvxlhgZF = ma.F = FA – FL – FC ⇒ FA – FL – FC = ma ⇒F − FL − FC 10 H − 5 H − 2 Hfk2.⇒a = A=m0,5 d]GZclbF2.Hl\_la fk2.5.
Ijb ^\b`_gbb \\_jo kdhjhklv b i_j_f_s_gb_ ijhlb\hiheh`ghgZijZ\e_gu k kbehc ly`_klb mkdhj_gb_ ² khgZijZ\e_gh Ijb^\b`_gbb\gbakdhjhklvi_j_f_s_gb_b mkdhj_gb_khgZijZ\e_gukkbehcly`_klb6. Mkdhj_gb_ \k_]^Z khgZijZ\e_gh k jZ\gh^_ckl\mxs_cijbeh`_gguo d l_em kbe Kdhjhklv b i_j_f_s_gb_ fh]ml [ulv dZdkhgZijZ\e_gu k jZ\gh^_ckl\mxs_c ijbeh`_gguo d l_em kbe lZd bijhlb\hiheh`ghgZijZ\e_guMijZ`g_gb_UU1. GZ l_eh ^_ckl\mxl kbeZ ly`_klb Fl b kbeZ j_Zdpbb hihju NkfjbkUNUFl2.
G_ ij_\ukbl ld jZ\gh^_ckl\mxsZy ijbeh`_gguo kbe gZ^bgZfhf_ljjZ\gZ3.>ZghJ_r_gb_IhhfmaZdhgmGvxlhgZm1 d]m2 d]F2x = m2ax d]⋅ fk2 Ga fk2 IhfmaZdhgmGvxlhgZF1x = –F2x ±GIhhfmaZdhgmGvxlhgZF1x = m1ax d]⋅ fk2 GIhfmaZdhgmGvxlhgZF2x = –F1x ±G < i_j\hf kemqZ_ gblv f_`^m l_e_`dZfb gZlygmlZkbevg__IhhfmaZdhgmGvxlhgZFx = (m1 + m2)ax d]d]⋅ fk2 GGZclb F1x, Hl\_lF1x ±GF2x GF1x GF2x =±G\ i_j\hfkemqZ_Fx GF2x, Fx.431.>Zghg ≈ fk2t=2cJ_r_gb_gt 2 10 fk 2 ⋅ (2 k )=22Hl\_lh f2h=GZclbh.2.>Zghg ≈ fk2h = 80 cf fGZclbt.3.>Zghg ≈ fk2h = 45 ft1 = 1 c∆t = 1 cGZclb t, s1, s2.>Zghv fkv1 = 0g fk2GZclbt, s.MijZ`g_gb_fJ_r_gb_gt 22h2 ⋅ 0,8 f⇒t=== 0,4 k.2g10 fk 2Hl\_lt kh=J_r_gb_h=gt 22h2 ⋅ 45 f⇒t==2g10 fk 2kgt12 10 fk 2 ⋅ (1 k )2== 5 f;222gt 2 g (t − ût )s2 =−=222210 fk 2 ⋅ (3 k ) 10 fk 2 ⋅ (3 c − 1 c )=−=5f22Hl\_lt ks1 fs2 fs1 =MijZ`g_gb_J_r_gb_v − v1 vv9,8 fkg== ⇒t= ==1 c;ttg 9,8 fk 2gt 29,8 fk 2 ⋅ (1k )fk ⋅ k ±22Hl\_lt ks f2s = vt −fMijZ`g_gb_1.
<k_l_eZiZ^ZxlgZa_fexih^^_ckl\b_fkbeuly`_klb2. KlZgpby m^Zey_lky hl A_feb ijb[eb`Zykv d Emg_ BaaZbaf_g_gbc jZkklhygbc f_`^m ieZg_lZfb b klZgpb_c kbeZ __ijbly`_gby d A_fe_ mf_gvrZ_lky Z kbeZ ijbly`_gby d Emg_44m\_ebqb\Z_lky Dh]^Z klZgpby gZoh^blky gZ k_j_^bg_ hgZ kbevg__ijbly]b\Z_lkyd A_fe_ldfZkkZA_feb[hevr_fZkkuEmgu3. G_l4.
Z^_ckl\h\ZeZ[ijbly`_gb_A_feb\baaZ^_ckl\bykbeuly`_klb5. >Zijbly]b\Z_lky ghwlZkbeZ]hjZa^hf_gvr_kbeuly`_klb baaZjZkklhygbcEmgZlZd`_ijbly]b\Z_lkyd wlhfmq_eh\_dm1.>Zghg ≈ fk2m1 d]m2 ] d]m3 l d]m4 l d]GZclb Fl1, Fl2, Fl3, Fl4.2.>Zghg ≈ fk2; m d]GZclbFl.3.>Zghg ≈ fk2;Fl GMijZ`g_gb_J_r_gb_Fl = mg ⇒Fl fk2 ⋅ d] GFl fk2 ⋅ d] GFl fk2 ⋅ d] G dGFl fk2 ⋅ d] ⋅105 G dGHl\_lGGdGdGJ_r_gb_Fl = mg d]⋅ fk2 GHl\_lFl GJ_r_gb_Fl 819,3 Gd]=g 10 fk 2GZclbFl.Hl\_lm d]4.
G_lihkdhevdm\ukhlZihe_lZkjZ\gbfZk jZaf_jZfbA_febKbemF a mjly`_klb fh`gh jZkkqblZlv ih nhjfme_ Fl = G ]^_ h —( Ra + h) 2\ukhlZgZ^A_fe_c5. GZyklj_[Z^_ckl\m_lkbeZly`_klbb _kebhgkeh`bldjuevylhhgmiZ^_lgZA_fex16. GZjZkklhygbbRa; 3Ra (Ra ²jZ^bmkA_febihkdhevdmFl~(Ra + h)2Fl = mg ⇒ m =MijZ`g_gb_U1. KbeZ F fh]eZ^_ckl\h\Zlvlhevdh\ gZijZ\e_gbb2. KbeZ ^_ckl\h\ZeZ gZ rZjbd gZ mqZkldZo RZjbdih\hjZqb\Zekyih^^_ckl\b_f\g_rgbokbe3. KbeZ^_ckl\h\ZeZgZl_ehgZ\_jgydZgZmqZkldZo:<&'GZl_ehfh]eZ^_ckl\h\ZlvkbeZb gZhklZevguomqZkldZo45MijZ`g_gb_1.>Zghr kf fv fkGZclba.2.>ZghR kf fT kGZclba.3.
Z1 =J_r_gb_v 2 (20 fk )2=≈ fk2.r0,21 fHl\_lZ ≈ fk2.Z=J_r_gb_Z=v2l 2πR4π 2 R 2 4π 2 R;v= =⇒Z= 2 = 2 =RTTT RT24 ⋅ (3,14 ) ⋅ 0,02 f=≈ 2⋅10-4 fk2.(60 k )2Hl\_lZ ≈ 2⋅10-4 fk2.v2v2v2; Z2 == 2a1 ⇒ ml\_j`^_gb_\_jgh= 2⋅rr/2r4.>ZghT1 kT2 kJ_r_gb_v 2 (2πR T1 )2 4π 2 R4π 2 Ra1 = 1 =. :gZeh]bqgh a 2 =.=2RRT1T22Ke_^h\Zl_evghGZclba1.a2Hl\_l5.>ZghFa = 6⋅1024 d]Fe = 6⋅1022 d]G ⋅ f2d] 2r = df= 3,84⋅108 fG=6,67⋅10-11GZclbF]j, Zp, v.2a1 T1 3600 c = = = 3600.a 2 T2 60 c 2a1= 3600.a2J_r_gb_ZF]j = G×F aF e2= 6,67⋅10-11r6 ⋅ 10 24 d] ⋅ 7 ⋅10 22 d](3,84 ⋅ 10 8 f 2[Zp =F]jFa=G ⋅ f2d] 2×≈ 1,9⋅1020 G1,9 ⋅ 10 20 G6 ⋅ 10 24 d]≈ 3,17⋅10-5 fk2;\v = ap r = 3,17 ⋅10−5 fk2 ⋅ 3,84⋅108 f ≈fkHl\_lF]j ≈ 1,9⋅1020 Gv ≈ fkZp = 3,17⋅10-5 fk2.46MijZ`g_gb_1.>Zghh df ⋅106 fFa = 6⋅1024 d]Ra = 6,4⋅106 fG = 6,67⋅10-11G ⋅ f2d] 2J_r_gb_Mav≈ G=Ra + h= 6,67 ⋅ 10−11G ⋅ f2d] 2⋅6 ⋅ 1024 d](2,6 ⋅ 106 f + 6,4 ⋅ 106 ffk dfkGZclbv.Hl\_lv dfk2.>ZghJ_r_gb_v dfk ⋅103 fkv2v21,67 ⋅10 3 fkre =⇒ re ==ge ≈ fk2rege1,6 fk 2= 1,7⋅106 f ⋅103 dfGZclb re.Hl\_lre = 1,7⋅103 df()=2=MijZ`g_gb_1.>Zghv1x = –v2x fkm = 0,2 d]GZclb p1x, p2x.2.>Zghv1 dfq fkv2 dfq fkm l d]GZclb ∆p.J_r_gb_p1x = mv1x d]⋅ fk d]⋅fkp2x = – p1x ±d]⋅fk<_dlhjubfimevkh\fZrbgg_jZ\guldhgbijhlb\hiheh`ghgZijZ\e_guFh^meb\_dlhjh\bfimevkh\jZ\guHl\_lp1x d]⋅fkp2x ±d]⋅fkJ_r_gb_∆j = m∆v = m(v2 – v1) =d]⋅ fk ± fk d]⋅fkHl\_l∆p d]⋅fkMijZ`g_gb_1.
Ih aZdhgm khojZg_gby bfimevkZ eh^dZ gZqg_l ^\b]Zlvky \klhjhgmijhlb\hiheh`gmx^\b`_gbxq_eh\_dZ472.>Zghm1 lm2 lv2 fkGZclb v1.1.>Zghve fkm\ d]v\ fkme d]J_r_gb_AZibr_faZdhgkhojZg_gbybfimevkZm + m2v2 =m1v1 = (m1 + m2)v2 ⇒ v1 = 1m135 l + 28 l=⋅ 0,5 fk fk35lHl\_lv1 fkJ_r_gb_AZibr_faZdhgkhojZg_gbybfimevkZ( m + m\ ) v e + m\ v \(me + m\)ve + m\v\ = mev ⇒ v = e=me(200 d] + 5 d] )⋅ 2 fk + 5 d] ⋅ 8 fk fk=200 d]Hl\_lv fkGZclb v.2.>Zghmj ] d]mi ] d]vi fkGZclb vj.MijZ`g_gb_J_r_gb_AZibr_faZdhgkhojZg_gbybfimevkZm v0,1 d] ⋅ 100 fkmjvj=mivi⇒vj= i i =≈ fkmj0,3 d]Hl\_lvj ≈ fkMijZ`g_gb_1.
Dhe_[Zl_evgufb kbkl_fZfb y\eyxlky [ ] _ G_ y\eyxlkydhe_[Zl_evgufbZ\^2. ZIh^^_ckl\b_fkbemijm]hklbrgmjh\[g_l\rgmju^bkd]^Zy\ey_lkyMijZ`g_gb_1. :fieblm^Z : qZklhlZ ν i_jbh^ L ² ihklhyggu_ F, v —i_j_f_ggu_2.>ZghJ_r_gb_11ν = =pT= == 0,5 kν 2 =pGZclb T.Hl\_lT k483.>ZghT kGZclb ν.4.>Zghn = 600t fbg kJ_r_gb_11ν= == 2 =pT 0,5 cHl\_lν =pJ_r_gb_1tn 600ν= ; T = ⇒ν= == 10 =pTnt 60 cGZclb ν.Hl\_lν =p5.
kfkfkfkf6.>ZghJ_r_gb_A = 10 kf11T = == 2 c AZ k l_eh kh\_jrZ_l ihegh_ν = 0,5 =pν 0,5 =pt kdhe_[Zgb_b ijhc^_limlvS = 4: kfGZclb S.Hl\_lS kf7. Dhe_[exlky \ h^bgZdh\uo nZaZo \ kemqZyo [ ^ Dhe_[exlky \ijhlb\hiheh`guonZaZo\ kemqZyoZ\]_MijZ`g_gb_GZijZ\e_gb_^\b`_gbyfZylgbdZHl< d Hmf_gvHl: d Hmf_gv1.HlH d :HlH d <Fmijm\_em\_evm\_emf_gv.m\_emf_gv.?i?dmf_gvm\_emf_gvm\_em\_em\_emf_gvmf_gv?iheK lj_ ;_a lj_gb_fgbymf_gvmf_gvmf_gvmf_gvg_baf_gg_baf_gg_baf_gg_baf_g2. Z >` >` [ >` >` >` \ >` \h \k_okemqZyoMijZ`g_gb_1. Kihkh[gu kh\_jrZlv k\h[h^gu_ dhe_[Zgby l_eZ [ _\ugm`^_ggu_dhe_[Zgby²\k_l_eZ2.
Z^ZgZijbf_jkljmgZfmaudZevgh]hbgkljmf_glZ[g_l49MijZ`g_gb_1. Z<ugm`^_ggu_[[eZ]h^Zjydhe_[ZgbxfZylgbdZ\qZklhlZfZylgbdZ jZ\gZ qZklhl_ fZylgbdZ m fZylgbdZ qZklhlZ [hevr_q_fm fZylgbdZm fZylgbdZqZklhlZf_gvr_q_fm fZylgbdZ]ldbo^ebgub khhl\_lkl\_gghkh[kl\_ggu_qZklhlukh\iZ^Zxl2. FZevqbdb \h^ZgZqbgZxldhe_[Zlvky\ ijhlb\hnZa_3. Q_j_ak L = 1/ν k1.>Zghλ fT kGZclb v.2.>Zghν =pv fkGZclb λ.3.2.>Zghv fkλ fGZclbT.MijZ`g_gb_J_r_gb_λ 270 fv= == 20 fkT 13,5 kHl\_lv fkJ_r_gb_v 340 fkλ= == 1,7 fν 200 =pHl\_lλ fJ_r_gb_λ6fv= == 4 kT 1,5 fkHl\_lT = 4 c.MijZ`g_gb_E_lysZyilbpZkha^Z_lbgnjZa\mdh\u_\heguMijZ`g_gb_1. DhfZjA\mdkha^Z\Z_fucbfkZfuc\ukhdbc2. Mf_gvrblkyihkdhevdmqZklhlZ__ \jZs_gbylZd`_mf_gvrblky3. Ijb ih\ur_gbb l_fi_jZlmju kljmgZ jZkly]b\Z_lky i_jbh^ __dhe_[Zgbc m\_ebqb\Z_lky qZklhlZ b khhl\_lkl\_ggh \ukhlZa\mqZgbymf_gvrZ_lkyMijZ`g_gb_1. G_lf_`^mA_fe_cb Emghcg_lmijm]hckj_^uihdhlhjhcfh`_ljZkijhkljZgylvkya\md2.
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