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{"id":3533,"date":"2016-06-10T02:30:33","date_gmt":"2016-06-10T02:30:33","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=3533"},"modified":"2016-06-10T02:30:33","modified_gmt":"2016-06-10T02:30:33","slug":"phuong-phap-hay-giup-diem-vat-ly-thi-thpt-quoc-gia","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/phuong-phap-hay-giup-diem-vat-ly-thi-thpt-quoc-gia\/","title":{"rendered":"Ph\u01b0\u01a1ng ph\u00e1p hay gi\u00fap \u0103n \u0111i\u1ec3m V\u1eadt l\u00fd thi THPT qu\u1ed1c gia"},"content":{"rendered":"
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\"Ph\u01b0\u01a1ng<\/h1>\n

\n

\n
D\u00f9ng v\u00f2ng tr\u00f2n l\u01b0\u1ee3ng gi\u00e1c l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p r\u1ea5t hay, nhanh lu\u00f4n \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 m\u1ea1nh trong vi\u1ec7c gi\u1ea3i \u0111\u1ec1 thi m\u00f4n V\u1eadt l\u00fd, \u0111\u1eb7c bi\u1ec7t trong k\u1ef3 thi THPT qu\u1ed1c gia.<\/div>\n<\/div>\n
\n

Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y d\u1ef1a tr\u00ean m\u1ed1i quan h\u1ec7 gi\u1eefa chuy\u00ean \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u v\u00e0 dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a. N\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i to\u00e1n t\u00ecm th\u1eddi gian, x\u00e1c \u0111\u1ecbnh th\u1eddi \u0111i\u1ec3m, x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng kh\u00e1c trong \u0111\u00f3 c\u00f3 gi\u1ea3 thi\u1ebft li\u00ean quan \u0111\u1ebfn th\u1eddi gian…<\/p>\n

T\u00e0i li\u1ec7u gi\u1edbi thi\u1ec7u v\u1ec1 ph\u01b0\u01a1ng ph\u00e1p n\u00e0y r\u1ea5t nhi\u1ec1u, c\u00f3 trong c\u00e1c s\u00e1ch tham kh\u1ea3o, c\u00e1c t\u00e0i li\u1ec7u c\u00f3 tr\u00ean m\u1ea1ng. Tuy nhi\u00ean, c\u00e1c t\u00e0i li\u1ec7u n\u00e0y ch\u1ec9 m\u1edbi xem x\u00e9t v\u00e0 gi\u1edbi thi\u1ec7u c\u00e1c b\u00e0i to\u00e1n \u1edf m\u1ee9c \u0111\u1ed9 c\u01a1 b\u1ea3n, s\u1eed d\u1ee5ng m\u1ed9t v\u00f2ng tr\u00f2n \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i to\u00e1n, ch\u01b0a c\u00f3 nhi\u1ec1u b\u00e0i kh\u00f3 \u0111\u01b0\u1ee3c gi\u1edbi thi\u1ec7u gi\u1ea3i quy\u1ebft b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p n\u00e0y.<\/p>\n

Do v\u1eady, \u0111\u1ec3 ho\u00e0n thi\u1ec7n h\u01a1n n\u1eefa v\u00e0 gi\u00fap th\u00ed sinh th\u1ea5y \u0111\u01b0\u1ee3c \u0111\u1ea7y \u0111\u1ee7 ph\u01b0\u01a1ng ph\u00e1p n\u00e0y, gi\u00e1o vi\u00ean s\u1eed d\u1ee5ng v\u00f2ng tr\u00f2n l\u01b0\u1ee3ng gi\u00e1c trong m\u1ed9t s\u1ed1 b\u00e0i to\u00e1n l\u1ea1 v\u00e0 kh\u00f3. C\u1ee5 th\u1ec3, s\u1eed d\u1ee5ng hai hay nhi\u1ec1u v\u00f2ng tr\u00f2n l\u01b0\u1ee3ng gi\u00e1c l\u1ed3ng nhau (c\u00f9ng t\u00e2m) \u0111\u1ec3 gi\u1ea3i quy\u1ebft b\u00e0i to\u00e1n li\u00ean quan \u0111\u1ebfn dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a c\u00f3 nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n, ho\u1eb7c c\u00e1c b\u00e0i to\u00e1n hai hay nhi\u1ec1u dao \u0111\u1ed9ng, b\u00e0i to\u00e1n t\u1ed5ng h\u1ee3p dao \u0111\u1ed9ng kh\u00f3,\u2026<\/p>\n

C\u00e1c b\u01b0\u1edbc gi\u1ea3i chung l\u00e0:<\/em><\/p>\n

B\u01b0\u1edbc 1: V\u1ebd hai hay nhi\u1ec1u v\u00f2ng tr\u00f2n l\u01b0\u1ee3ng gi\u00e1c c\u00f9ng t\u00e2m, kh\u00e1c b\u00e1n k\u00ednh.<\/p>\n

B\u01b0\u1edbc 2: K\u1ebb c\u00e1c tr\u1ee5c g\u1ed1c c\u1ee7a c\u00e1c dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a(c\u0103n c\u1ee9 v\u00e0o \u0111\u1ed9 l\u1ec7ch pha v\u00e0 d\u1ea5u c\u00e1c h\u00e0m \u0111i\u1ec1u h\u00f2a \u0111\u1ec3 v\u1ebd).<\/p>\n

B\u01b0\u1edbc 3: D\u1ef1a v\u00e0o gi\u1ea3 thi\u1ebft, th\u1ec3 hi\u1ec7n c\u00e1c th\u00f4ng tin tr\u00ean c\u00e1c v\u00f2ng tr\u00f2n.<\/p>\n

B\u01b0\u1edbc 4: S\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 to\u00e1n kh\u00e1c h\u1ed7 tr\u1ee3 gi\u1ea3i quy\u1ebft y\u00eau c\u1ea7u \u0111\u1ec1 b\u00e0i.<\/p>\n

D\u01b0\u1edbi \u0111\u00e2y l\u00e0 chi ti\u1ebft ph\u01b0\u01a1ng ph\u00e1p n\u00e0y th\u00f4ng qua vi\u1ec7c gi\u1edbi thi\u1ec7u hai b\u00e0i to\u00e1n : B\u00e0i to\u00e1n th\u1ecfa m\u00e3n nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n v\u00e0 b\u00e0i to\u00e1n x\u00e9t quan h\u1ec7 hai hay nhi\u1ec1u dao \u0111\u1ed9ng.<\/p>\n

B\u00e0i to\u00e1n th\u1ecfa m\u00e3n nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n<\/strong><\/p>\n

B\u00e0i to\u00e1n n\u00e0y c\u00f3 th\u1ec3 l\u00e0 c\u00e1c b\u00e0i dao \u0111\u1ed9ng c\u01a1, s\u00f3ng c\u01a1, \u0111i\u1ec7n xoay chi\u1ec1u, dao \u0111\u1ed9ng \u0111i\u1ec7n t\u1eeb li\u00ean quan \u0111\u1ebfn c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a, nh\u01b0ng gi\u1eefa c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng c\u00f3 m\u1ed1i quan h\u1ec7 v\u1ec1 pha, quan h\u1ec7 v\u1ec1 bi\u00ean \u0111\u1ed9,\u2026<\/p>\n

V\u00ed d\u1ee5: M\u1ed9t con l\u1eafc l\u00f2 xo treo v\u00e0o m\u1ed9t \u0111i\u1ec3m c\u1ed1 \u0111\u1ecbnh, dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a theo ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng v\u1edbi chu k\u00ec 1,2 s. Trong m\u1ed9t chu k\u00ec, n\u1ebfu th\u1eddi gian m\u00e0 l\u1ef1c \u0111\u00e0n h\u1ed3i ng\u01b0\u1ee3c chi\u1ec1u l\u1ef1c k\u00e9o v\u1ec1 l\u00e0 0,2 th\u00ec t\u1ec9 s\u1ed1 c\u1ee7a th\u1eddi gian l\u00f2 xo gi\u00e3n v\u1edbi th\u1eddi gian l\u00f2 xo n\u00e9n b\u1eb1ng:<\/p>\n

A. 3<\/p>\n

B. 4<\/p>\n

C. 1<\/p>\n

D. 2<\/p>\n

H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/em> Tr\u00ean h\u00ecnh v\u1ebd, \u0111\u01b0\u1eddng tr\u00f2n l\u1ef1c k\u00e9o v\u1ec1 c\u00f3 b\u00e1n k\u00ednh l\u00e0 k.A \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n b\u1eb1ng \u0111\u01b0\u1eddng li\u1ec1n, tr\u1ee5c li\u1ec1n. \u0110\u01b0\u1eddng tr\u00f2n l\u1ef1c \u0111\u00e0n h\u1ed3i l\u00e0 \u0111\u01b0\u1eddng \u0111\u1ee9t c\u00f3 b\u00e1n k\u00ednh c\u0169ng l\u00e0 k.A (hai \u0111\u01b0\u1eddng tr\u00f2n tr\u00f9ng nhau nh\u01b0ng g\u1ed1c kh\u00f4ng tr\u00f9ng), tuy nhi\u00ean ta th\u1ec3 hi\u1ec7n hai \u0111\u01b0\u1eddng tr\u00f2n cho d\u1ec5 ph\u00e2n bi\u1ec7t.<\/p>\n

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\"\"<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Xem c\u00e1c b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng T\u1ea0I \u0110\u00c2Y<\/strong><\/a><\/p>\n

B\u00e0i to\u00e1n x\u00e9t quan h\u1ec7 hai hay nhi\u1ec1u dao \u0111\u1ed9ng<\/strong><\/p>\n

N\u1ebfu trong \u0111\u1ec1 thi cho hai hay nhi\u1ec1u dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a c\u00f9ng ph\u01b0\u01a1ng c\u00f9ng g\u1ed1c t\u1ecda \u0111\u1ed9 O, ho\u1eb7c hai hay nhi\u1ec1u dao \u0111\u1ed9ng th\u00e0nh ph\u1ea7n c\u1ee7a m\u1ed9t dao \u0111\u1ed9ng t\u1ed5ng h\u1ee3p c\u00f3 c\u00f9ng ph\u01b0\u01a1ng dao \u0111\u1ed9ng th\u00ec ph\u01b0\u01a1ng ph\u00e1p v\u00f2ng tr\u00f2n l\u01b0\u1ee3ng gi\u00e1c c\u0169ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng. C\u1ee5 th\u1ec3 t\u00f4i xin gi\u1edbi thi\u1ec7u hai v\u00ed d\u1ee5 m\u1eabu v\u00e0 m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng sau<\/p>\n

V\u00ed d\u1ee5: Hai ch\u1ea5t \u0111i\u1ec3m dao \u0111\u1ed9ng \u0111i\u1ec1u ho\u00e0 v\u1edbi c\u00f9ng t\u1ea7n s\u1ed1 f = 0,25 Hz d\u1ecdc theo hai \u0111\u01b0\u1eddng th\u1eb3ng song song c\u1ea1nh nhau v\u00e0 song song v\u1edbi tr\u1ee5c Ox. V\u1ecb tr\u00ed c\u00e2n b\u1eb1ng c\u1ee7a hai ch\u1ea5t \u0111i\u1ec3m \u1edf tr\u00ean c\u00f9ng m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng qua g\u1ed1c to\u1ea1 \u0111\u1ed9 v\u00e0 vu\u00f4ng g\u00f3c v\u1edbi tr\u1ee5c Ox. Trong qu\u00e1 tr\u00ecnh dao \u0111\u1ed9ng, kho\u1ea3ng c\u00e1ch l\u1edbn nh\u1ea5t gi\u1eefa hai ch\u1ea5t \u0111i\u1ec3m theo ph\u01b0\u01a1ng Ox l\u00e0 16 cm. T\u1ea1i th\u1eddi \u0111i\u1ec3m t, hai ch\u1ea5t \u0111i\u1ec3m \u0111i ngang qua nhau. Th\u1eddi gian ng\u1eafn nh\u1ea5t sau \u0111\u00f3 \u0111\u1ec3 kho\u1ea3ng c\u00e1ch gi\u1eefa hai ch\u1ea5t \u0111i\u1ec3m b\u1eb1ng 8 cm theo ph\u01b0\u01a1ng Ox c\u00f3 gi\u00e1 tr\u1ecb l\u00e0:<\/p>\n

A. 1\/12s<\/p>\n

B. 1\/4s<\/p>\n

C. 1\/3s<\/p>\n

D. 1\/6s<\/p>\n

H\u01b0\u1edbng d\u1eabn gi\u1ea3i:<\/em> V\u1ebd hai v\u00f2ng tr\u00f2n th\u1ec3 hi\u1ec7n cho hai dao \u0111\u1ed9ng c\u00f9ng t\u1ea7n s\u1ed1. bi\u00ean \u0111\u1ed9 A1=OM, A2=ON.<\/p>\n

Gi\u1ea3 s\u1eed ch\u1ea5t \u0111i\u1ec3m 1 dao \u0111\u1ed9ng nhanh pha h\u01a1n ch\u1ea5t \u0111i\u1ec3m 2. Khi kho\u1ea3ng c\u00e1ch gi\u1eefa hai ch\u1ea5t \u0111i\u1ec3m theo ph\u01b0\u01a1ng Ox l\u00e0 l\u1edbn nh\u1ea5t th\u00ec MN\/\/Ox ta c\u00f3 MN=16cm.<\/p>\n

T\u1ea1i th\u1eddi \u0111i\u1ec3m t hai ch\u1ea5t \u0111i\u1ec3m \u0111i ngang qua nhau (v\u1ecb tr\u00ed M1 v\u00e0 N1) ta c\u00f3 M1N1 vu\u00f4ng g\u00f3c Ox.<\/p>\n

V\u1ecb tr\u00ed m\u00e0 kho\u1ea3ng c\u00e1ch gi\u1eefa hai ch\u1ea5t \u0111i\u1ec3m theo ph\u01b0\u01a1ng Ox b\u1eb1ng 8 l\u00e0 v\u1ecb tr\u00ed M2N2 c\u00f3 h\u00ecnh chi\u1ebfu l\u00ean Ox b\u1eb1ng 8cm, m\u00e0 M2N2=16cm. V\u1eady v\u1ecb tr\u00ed n\u00e0y M2N2 h\u1ee3p v\u1edbi ph\u01b0\u01a1ng ngang g\u00f3c 600 t\u1ee9c l\u00e0 h\u1ee3p v\u1edbi M1N1 m\u1ed9t g\u00f3c 30 \u0111\u1ed9.<\/p>\n

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\"\"<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n

Th\u1ea7y Chu Anh Tu\u1ea5n \u2013 Tr\u01b0\u1eddng THPT Y\u00ean Kh\u00e1nh A (Ninh B\u00ecnh)<\/strong><\/p>\n

Theo giaoducthoidai.vn<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

D\u00f9ng v\u00f2ng tr\u00f2n l\u01b0\u1ee3ng gi\u00e1c l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p r\u1ea5t hay, nhanh lu\u00f4n \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 m\u1ea1nh trong vi\u1ec7c gi\u1ea3i \u0111\u1ec1 thi m\u00f4n V\u1eadt l\u00fd, \u0111\u1eb7c bi\u1ec7t trong k\u1ef3 thi THPT qu\u1ed1c gia. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y d\u1ef1a tr\u00ean m\u1ed1i quan h\u1ec7 gi\u1eefa chuy\u00ean \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u v\u00e0 dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a. N\u00f3 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[25],"tags":[],"yoast_head":"\nPh\u01b0\u01a1ng ph\u00e1p hay gi\u00fap \u0103n \u0111i\u1ec3m V\u1eadt l\u00fd thi THPT qu\u1ed1c gia<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lop12.edu.vn\/phuong-phap-hay-giup-diem-vat-ly-thi-thpt-quoc-gia\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ph\u01b0\u01a1ng ph\u00e1p hay gi\u00fap \u0103n \u0111i\u1ec3m V\u1eadt l\u00fd thi THPT qu\u1ed1c gia\" \/>\n<meta property=\"og:description\" content=\"D\u00f9ng v\u00f2ng tr\u00f2n l\u01b0\u1ee3ng gi\u00e1c l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p r\u1ea5t hay, nhanh lu\u00f4n \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 m\u1ea1nh trong vi\u1ec7c gi\u1ea3i \u0111\u1ec1 thi m\u00f4n V\u1eadt l\u00fd, \u0111\u1eb7c bi\u1ec7t trong k\u1ef3 thi THPT qu\u1ed1c gia. 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