Физика-9кл-Перышкин-Гутник-2001-ГДZ (991173), страница 9
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< mkeh\byo k\h[h^gh]h iZ^_gby kdhjhklb h[hbo rZjbdh\ \ex[hc fhf_gl \j_f_gb [m^ml h^bgZdh\u b ke_^h\Zl_evghhlghr_gb_ bo bfimevkh\ [m^_l aZ\bk_lv ebrv hl hlghr_gby bofZkk LZd dZd ih mkeh\bx h[t_fu h^bgZdh\u hgh [m^_l jZ\ghρ f 8,9 ⋅ 10 3 d]f 3=≈ 3,3.ρ Z 2,7 ⋅10 3 d]f 3BlZd \ ex[hc fhf_gl \j_f_gb f_^guc rZjbd bf__l bfimevkijbf_jgh\ jZaZ[hevr_q_fZexfbgb_\uc31.^hklhedgh\_gbyX12hlghr_gbxiehlghkl_cf_^bb Zexfbgbyihke_klhedgh\_gby12X^hklhedgh\_gby12X2X>Zghv1x fkv2x fkv1′ x fkGZclbv.32.J_r_gb_Ih aZdhgm khojZg_gby bfimevkZ gZ hkv O):mv1x + mv2 x = mv1′ x + mv′2 x ⇒ v ′2 x = v1x + v 2 x − v1′ x =fk fk ±fk fkHl\_l v ′2 x fkihke_klhedgh\_gby1>Zghv1x fkv2x ±fkv1′ x = –fkGZclbv.J_r_gb_Ih aZdhgm khojZg_gby bfimevkZ gZ hkv O):mv1x + mv2 x = mv1′ x + mv′2 x ⇒ v ′2 x = v1x + v 2 x − v1′ x =fk ±fk±±fk fkHl\_l v ′2 x fk33.E=()()mv12x mv22x m 2mv ′ 2 mv ′22x m+= ⋅ v1x + v 22x ; E ′ = 1x += ⋅ v1′ x2 + v ′22x ;22222261v12x + v22x fk2 + ±fk2 = 0,05 f2k2; v1′x2 + v′22x ±fk2 ++ fk = 0,05 f k ⇒ v1x + v2 x = v1′ x + v′2 x ⇒ E = E′.22222234.
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Ihevamykv ]jZnbdhf hij_^_ey_f Z ijb =p Zfieblm^ZmklZgh\b\rboky dhe_[Zgbc [m^_l [hevr_ q_f ijb =p [ qlh[uZfieblm^Z mklZgh\b\rboky dhe_[Zgbc [ueZ fZdkbfZevghc dZq_ebgZ^hih^lZedb\Zlvk qZklhlhc=p\kh[kl\_ggZy qZklhlZ dZq_e_cjZ\gZqZklhl_\ugm`^Zxs_ckbeul_=p38.>Zgh:J_r_gb_l kf fmg 0,002 d] ⋅ 9,8 fk 2==m ] d] Fl = Ff; mg = BIl ⇒ I =Bl4 ⋅10 −2 Le ⋅ 0,1 fB = 4 ⋅ 10-2 Le= 4,9 A.GZclbI.Hl\_l: I = 4,9 A.39.
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