... LUYỆN THI ĐẠI HỌC MÔN VẬTLÝ Email: Jackie9x.spb@gmail.com 1 HỆ THỐNG LÝ THUYẾT VÀ CÁCDẠNGBÀITẬPVẬTLÝ10 * Tóm tắt lý thuyết * Công thức tính nhanh * Cácdạngbàitập và phƣơng pháp ... 21 FFF; với F 2 = F1 2 + F 2 2 + 2F1F 2 cos.; F1 + F 2 ≥ F ≥ |F1 – F 2 |. Khi 1Fvà 2 F cùng phương, cùng chiều ( = 00) thì F = F1 + F 2 . 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... =R 2 Z 2 C+(ZLZC− 1) 2 =(R 2 + Z 2 L)1Z 2 C− 2. ZL1ZC+1=(R 2 + Z 2 L)x 2 − 2. ZLx +1Trong đó: x =1ZC;Tacó:a =(R 2 + Z 2 L) > 0Nên y = min khi x = −b2a=ZLR 2 + Z 2 L, ... =R 2 Z 2 L+(1−ZCZL) 2 =(R 2 + Z 2 C)1Z 2 L− 2. ZC1ZL+1=(R 2 + Z 2 C)x 2 − 2. ZCx +1Trong đó: x =1ZL; Ta có: a =(R 2 + Z 2 C) > 0Nên y = min khi x = −b2a=ZCR 2 + ... EtB1max= mgh1,hayE1=1 2 mglα 2 1Cơ năng ở chu kì 2: E 2 = EtB 2 max= mgh1,hayE 2 =1 2 mglα 2 2Độ giảm cơ năng sau 1 chu kỳ: ∆E =1 2 mgl(α 2 1− α 2 2)Th.s Trần AnhTrung33Luyện...
... =R 2 ω 2 L 2 +(1−1ω 2 CL) 2 =1C 2 L 2 1ω4+R 2 L 2 − 2 1CL1ω 2 +1Hay: y =1C 2 L 2 x 2 +R 2 L 2 − 2 1CLx +1với x =1ω 2 Ta có: a =1C 2 L 2 > 0Nên y = min khi x = −b2a= 2 CL−R 2 L 2 .L 2 C 2 2=2LC − R 2 C 2 2Vậy ... hoà.Chu kỳ: T = 2 ωhay T =2 4mkCách 2: Cơ năng:E = Eđ+ Et=1 2 mv 2 +1 2 kx 2 L=1 2 mv 2 +1 2 k(x 2 ) 2 = constĐạo hàm hai vế theo thời gian:1 2 m2vv+1 2 k42xx=0⇔ x”+k4mx ... I.ZL=UZLR 2 +(ZL− ZC) 2 =UωLR 2 +ωL−1ωC 2 =UR 2 ω 2 L 2 +1 −1ω 2 CL 2 Hay UL=const√y,đểULcực đại khi y = min.Ta có: y =R 2 ω 2 L 2 +(1−1ω 2 CL) 2 =1C 2 L 2 1ω4+R 2 L 2 −...
... giác vì dòng điện lớn)Phương Uyên CÁCDẠNGBÀITẬPVẬTLÝ 12 10 Phương Uyên CÁCDẠNGBÀITẬPVẬTLÝ 12 3+ Tìm A = 2 2 2 ωvx+(hay từ cơ năng E = 2 21kA) + Tìm ω= mk(con lắc lò ... tWtCqCqCuWđ)(cos)(cos 22 1 2 1 22 2 0 2 2ϕωϕω+=+===, tần số góc dao động của đWlà 2 ω chukì 2 T. tW = )(sin)(sin 22 1 22 2 0 2 ϕωϕω+=+=tWtCqLi, tần số góc dao động của tWlà 2 ω, chu kì 2 TTrong ... Năng lượng từ trường : 2 21LiWt= ⇒ 2 0max 2 1LIWt=+ Năng lượng điện từ : W = 2 21Cu+ 2 21Li= Cq 2 21+ 2 21Li= CQCU 2 0 2 0 2 1 2 1= 2 0 2 1LI= . Vậy =maxđWmaxtW+...
... lúc t1 = 2s vật đến A có tọa độ x1= 6m lúc t 2 =5s vật đến B có tọa độ x 2 =12m. Viết phương trình tọa độ của vật. Bài 4. Hai thành phố A,B cách nhau 28 km. Cùng một lúc có 2 ô tô chạy ... Trường THPT Đại an Bàitậpvậtlý10 nâng caoCHƯƠNG I : ĐỘNG HỌC CHẤT DIỂM Bài 1. Hai thành phố A,B cách nhau 40km. Cùng một lúc xe thứ I qua A với vận tốc 10 km/h, xe thứ 2 qua B với vận tốc ... 0,05s ) 10. Một vật rơi tự do trong thời gian 10s. Hãy tính thời gian vật rơi trong 10 m đầu tiên và thời gian vật rơi trong 10 m cuối cùng? Lấy g = 10m/s 2 ( Đs. 1,41s; 0,1s ) 11.Một vật rơi...
... Năng lượng từ trường : 2 21LiWt= ⇒ 2 0max 2 1LIWt=+ Năng lượng điện từ : W = 2 21Cu+ 2 21Li= Cq 2 21+ 2 21Li= CQCU 2 0 2 0 2 1 2 1= 2 0 2 1LI= . Vậy =maxđWmaxtW+ ... khác 2 π mạch có R,C - Nếu 0<ϕ và khác - 2 π mạch có R,C Hữu Nghĩa CÁCDẠNGBÀITẬPVẬTLÝ 12 Website: xomcodon.tk 9+ Năng lượng: tWtCqCqCuWđ)(cos)(cos 22 1 2 1 22 2 0 2 2ϕωϕω+=+===, ... Nghĩa CÁCDẠNGBÀITẬPVẬTLÝ 12 Website: xomcodon.tk 10 + Năng lượng nghỉ E0 = m0c 2 , năng lượng toàn phần E = mc 2 = 2 2 2 01ccvm−+ Hệ thức giữa năng lượng và động lượng E 2 = 2 0m 22 4cpc++...
... x’’= -x 2 ω.+ Hệ thức độc lập : 1 22 2 2 2 =+ωAvAx ⇒ v = 22 xA−ω và: A = 2 2 2 ωvx+- Lực kéo về: 5 CÁCDẠNGBÀITẬPVẬTLÝ 12 Chuyên đề1 : Động lực học vật rắn Các công ... tWtCqCqCuWđ)(cos)(cos 22 1 2 1 22 2 0 2 2ϕωϕω+=+===tW = )(sin)(sin 22 1 22 2 0 2 ϕωϕω+=+=tWtCqLi, (tần số góc dao động của tWlà 2 ω, chu kì 2 T)Trong 1 chu kì: CqWWtđ4 2 0== hai ... nhỏ thì: 2 1 2 1NNee= 2 1 2 1NNEE=⇒- Nếu các cuộn dây có điện trở thuần: 1e xem như nguồn thu: 1111riue−= , 2 exem như nguồn phát: 22 22 riue+=. Vậy: 2 1 22 2111 2 1NNriuriuee=+−=...
... f1 ; Mạch L 2 và C có tần số f 2 ): 22222 21 2 1 2 1 2 22 21 2 1 1 1 nt Lnt ntntL T T Tf f f 22 2 1 2 // 1 2 22222 2 // 1 2 // 1 2 1 1 1 1 1 1 ... và C 2 có tần số f 2 ) 22 2 1 2 1 2 22222 2 1 2 1 2 1 1 1 1 1 1C nt Cntnt ntf f fT T T 22222 21 2 // 1 2 // 1 2 22 2// 1 2 1 1 1C // C T T Tf f f ... = - 2 x 6. Cơ năng: 2 2đ1W W W 2 tm A Với 2222 2 đ1 1W sin ( ) Wsin ( ) 2 2mv m A t t 22222 21 1W ( ) W s ( ) 2 2tm x m A cos t co t...
... và R 2 và có hệ thức: R1.R 2 = r 2 :Từ (1) Px. (Rx + r) 2 = U 2 . Rx Px.Rx 2 - (U 2 - 2rPx).Rx + r 2 .Px = 0 (3) = (U 2 - 2r.Px) 2 - 4Px 2 .r 2 Thay U 2 = 4r.Pcđ ... thời gian cácdạngbàitậpVậtlý là điều cần thiết đối với giáo viên Vật lý để hướng dẫn cho học sinh. Hơn nữa, trong phần điện học, cácdạng bài tập nâng cao thường “khó” hơn so với các phần ... Trong cácbài toán nếu không có ghi chú gì đặc biệt, người ta thường coi là RA 0; RV = .5 .2. CÁCDẠNGBÀITẬP NÂNG CAO VÀ PHƯƠNG PHÁP GIẢI5 .2. 1. Bài toán chia dòng: ooII1I 2 I3InR1R 2 R3RnĐoạn...