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{"id":26319,"date":"2018-04-10T17:03:48","date_gmt":"2018-04-10T10:03:48","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=26319"},"modified":"2018-04-10T17:03:48","modified_gmt":"2018-04-10T10:03:48","slug":"bai-tap-trac-nghiem-vat-li-12-chuong-1-phan-1","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-chuong-1-phan-1\/","title":{"rendered":"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: Ch\u01b0\u01a1ng 1 (ph\u1ea7n 1)"},"content":{"rendered":"

C\u00e2u 1:<\/b>\u00a0M\u1ed9t ch\u1ea5t \u0111i\u1ec3m dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a tr\u00ean \u0111o\u1ea1n th\u1eb3ng MN d\u00e0i 12 cm v\u1edbi t\u1ea7n s\u1ed1 2 Hz, Ch\u1ecdn g\u1ed1c th\u1eddi gian l\u00e0 l\u00fac ch\u1ea5t \u0111i\u1ec3m c\u00f3 li \u0111\u1ed9 3\u221a3 cm v\u00e0 chuy\u1ec3n \u0111\u1ed9ng ng\u01b0\u1ee3c chi\u1ec1u v\u1edbi chi\u1ec1u d\u01b0\u01a1ng \u0111\u00e3 ch\u1ecdn. Ph\u01b0\u01a1ng tr\u00ecnh dao \u0111\u1ed9ng c\u1ee7a ch\u1ea5t \u0111i\u1ec3m l\u00e0<\/p>\n

\"B\u00e0i<\/p>\n

C\u00e2u 2:<\/b>\u00a0M\u1ed9t ch\u1ea5t \u0111i\u1ec3m dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a v\u1edbi t\u1ea5n s\u1ed1 3 Hz tr\u00ean qu\u1ef9 \u0111\u1ea1o l\u00e0 m\u1ed9t \u0111o\u1ea1n th\u1eb3ng d\u00e0i 12 cm. V\u1eadn t\u1ed1c c\u1ee7a ch\u1ea5t \u0111i\u1ec3m c\u00f3 \u0111\u1ed9 l\u1edbn c\u1ef1c \u0111\u1ea1i b\u1eb1ng<\/p>\n

A. 30 cm\/s \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 20 cm\/s. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C. 113 cm\/s \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 0,52 m\/s<\/p>\n

C\u00e2u 3:<\/b>\u00a0Hai dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a c\u00f9ng ph\u01b0\u01a1ng, c\u00f3 c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh dao \u0111\u1ed9ng l\u00e0<\/p>\n

\"B\u00e0i<\/p>\n

Bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng t\u1ed5ng h\u1ee3p l\u00e0<\/p>\n

A. 5\u221a3 cm. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 2,5\u221a3 cm. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C. 5 cm. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 2,5 cm.<\/p>\n

C\u00e2u 4:<\/b>\u00a0Hai dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a c\u00f9ng ph\u01b0\u01a1ng, c\u00f9ng t\u1ea7n s\u1ed1 c\u00f3 c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh dao \u0111\u1ed9ng l\u00e0:<\/p>\n

\"B\u00e0i<\/p>\n

Ph\u01b0\u01a1ng tr\u00ecnh dao \u0111\u1ed9ng t\u1ed5ng h\u1ee3p l\u00e0: x=9cos\u2061(\u03c9t+ \u03c6) (cm). Bi\u00ean \u0111\u1ed9 A1<\/sub>\u00a0thay \u0111\u1ed5i \u0111\u01b0\u1ee3c. Bi\u1ebft A1<\/sub>\u00a0c\u00f3 gi\u00e1 tr\u1ecb sao cho A2<\/sub>\u00a0c\u00f3 gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t. Gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t c\u1ee7a A2<\/sub>\u00a0khi \u0111\u00f3 l\u00e0<\/p>\n

A. 9 cm. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 18 cm. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C. 9\u221a2 cm. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 9\u221a3 cm.<\/p>\n

C\u00e2u 5:<\/b>\u00a0M\u1ed9t v\u1eadt dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a theo ph\u01b0\u01a1ng ngang, m\u1ed1c th\u1ebf n\u0103ng t\u1ea1i v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng. Khi l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean v\u1eadt c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng 0,25 \u0111\u1ed9 l\u1edbn l\u1ef1c c\u1ef1c \u0111\u1ea1i t\u00e1c d\u1ee5ng l\u00ean v\u1eadt th\u00ec t\u1ec9 s\u1ed1 gi\u1eef th\u1ebf n\u0103ng v\u00e0 \u0111\u1ed9ng n\u0103ng c\u1ee7a con l\u1eafc l\u00e0<\/p>\n

A. 16 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 15 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C. 1\/15 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 1\/16<\/p>\n

C\u00e2u 6:<\/b>\u00a0M\u1ed9t v\u1eadt dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a v\u1edbi chu k\u00ec b\u1eb1ng T, t\u1ea1i th\u1eddi \u0111i\u1ec3m t = 0 v\u1eadt \u0111i qua v\u1ecb tr\u00ed c\u00f3 li \u0111\u1ed9 b\u1eb1ng m\u1ed9t n\u1eeda bi\u00ean \u0111\u1ed9 v\u00e0 \u0111ang \u0111i theo chi\u1ec1u \u00e2m c\u1ee7a tr\u1ee5c t\u1ecda \u0111\u1ed9. Trong th\u1eddi gian 16T\/3 k\u1ec3 t\u1eeb t = 0 v\u1eadt \u0111i \u0111\u01b0\u1ee3c qu\u00e3ng \u0111\u01b0\u1eddng 1,29 m. Bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u1ee7a v\u1eadt b\u1eb1ng<\/p>\n

A. 6 cm \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 8 cm \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C. 10 cm \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 5 cm<\/p>\n

C\u00e2u 7:<\/b>\u00a0M\u1ed9t con l\u1eafc l\u00f2 xo th\u1eb3ng \u0111\u1ee9ng, \u0111\u1ea7u d\u01b0\u1edbi c\u00f3 v\u1eadt m, dao \u0111\u1ed9ng v\u1edbi bi\u00ean \u0111\u1ed9 6,25 cm, t\u1ec9 s\u1ed1 gi\u1eefa l\u1ef1c c\u1ef1c \u0111\u1ea1i v\u00e0 l\u1ef1c c\u1ef1c ti\u1ec3u t\u00e1c d\u1ee5ng v\u00e0o \u0111i\u1ec3m treo trong qu\u00e1 tr\u00ecnh dao \u0111\u1ed9ng l\u00e0 5\/3; l\u1ea5y g = \u03c02<\/sup>\u00a0= 10 m\/s2<\/sup>. T\u1ea7n s\u1ed1 dao \u0111\u1ed9ng l\u00e0<\/p>\n

A. 1 Hz \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 0,5 Hz \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C. 0,25 Hz \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 0,75 Hz.<\/p>\n

H\u01b0\u1edbng d\u1eabn gi\u1ea3i v\u00e0 \u0111\u00e1p \u00e1n<\/b><\/p>\n\n\n\n\n
C\u00e2u<\/td>\n1<\/td>\n2<\/td>\n3<\/td>\n4<\/td>\n5<\/td>\n6<\/td>\n7<\/td>\n<\/tr>\n
\u0110\u00e1p \u00e1n<\/td>\nB<\/td>\nC<\/td>\nB<\/td>\nB<\/td>\nC<\/td>\nA<\/td>\nA<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n
<\/div>\n<\/div>\n

C\u00e2u 1:<\/b>\u00a0B<\/p>\n

Ph\u01b0\u01a1ng tr\u00ecnh dao \u0111\u1ed9ng c\u00f3 d\u1ea1ng : x = Acos(\u03c9t + \u03c6)<\/p>\n

\u21d2 V\u1eadn t\u1ed1c v = \u2013 \u03c9Asin(\u03c9t + \u03c6), trong \u0111\u00f3 A = 6 cm, \u03c9 = 2\u03c0f = 4\u03c0 (rad\/s).<\/p>\n

Ch\u1ecdn g\u1ed1c th\u1eddi gian t = 0 l\u00e0 l\u00fac x=3\u221a3 cm , v\u00e0 v < 0<\/p>\n

\"B\u00e0i<\/p>\n

C\u00e2u 2:<\/b>\u00a0C<\/p>\n

V\u00ec chi\u1ec1u d\u00e0i qu\u1ef9 \u0111\u1ea1o L = 2A, n\u00ean bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng : A = 6 cm<\/p>\n

|vmax<\/sub>\u00a0|=A\u03c9=6.2\u03c0.3=113 cm\/s<\/p>\n

C\u00e2u 3:<\/b>\u00a0B<\/p>\n

A2<\/sup>=A1<\/sub>2<\/sup>+A2<\/sub>2<\/sup>+2A1<\/sub>\u00a0A2<\/sub>\u00a0cos(\u03c61<\/sub>-\u03c62<\/sup>\u00a0)=2A1<\/sub>2<\/sup>+2A2<\/sub>2<\/sup>\u00a0cos \u03c0\/3<\/p>\n

\u21d2A=A1<\/sub>\u00a0\u221a3=2,5\u221a3 cm<\/p>\n

C\u00e2u 4:<\/b>\u00a0B<\/p>\n

Ta c\u00f3 : A2<\/sup>=A1<\/sub>2<\/sup>+A2<\/sub>2<\/sup>+2A1<\/sub>\u00a0A2<\/sub>\u00a0cos(5\u03c0\/6)<\/p>\n

\u27faA1<\/sub>2<\/sup>-\u221a3 A2<\/sub>\u00a0A1<\/sub>+A2<\/sub>2<\/sup>-92<\/sup>=0 (1)<\/p>\n

Ph\u01b0\u01a1ng tr\u00ecnh (1) c\u00f3 nghi\u1ec7m A1<\/sub>\u00a0khi \u0394=3A2<\/sub>2<\/sup>-4(A2<\/sub>2<\/sup>-92<\/sup>\u00a0)\u22650<\/p>\n

\u21d2A2<\/sub>\u226418. Do \u0111\u00f3 A2<\/sub>max=18 cm<\/p>\n

C\u00e2u 5:<\/b>\u00a0C<\/p>\n

\"B\u00e0i<\/p>\n

C\u00e2u 6:<\/b><\/p>\n

\"B\u00e0i<\/p>\n

C\u00e2u 7:<\/b>\u00a0A<\/p>\n

\"B\u00e0i<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00e2u 1:\u00a0M\u1ed9t ch\u1ea5t \u0111i\u1ec3m dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a tr\u00ean \u0111o\u1ea1n th\u1eb3ng MN d\u00e0i 12 cm v\u1edbi t\u1ea7n s\u1ed1 2 Hz, Ch\u1ecdn g\u1ed1c th\u1eddi gian l\u00e0 l\u00fac ch\u1ea5t \u0111i\u1ec3m c\u00f3 li \u0111\u1ed9 3\u221a3 cm v\u00e0 chuy\u1ec3n \u0111\u1ed9ng ng\u01b0\u1ee3c chi\u1ec1u v\u1edbi chi\u1ec1u d\u01b0\u01a1ng \u0111\u00e3 ch\u1ecdn. Ph\u01b0\u01a1ng tr\u00ecnh dao \u0111\u1ed9ng c\u1ee7a ch\u1ea5t \u0111i\u1ec3m l\u00e0 C\u00e2u 2:\u00a0M\u1ed9t ch\u1ea5t \u0111i\u1ec3m […]<\/p>\n","protected":false},"author":3,"featured_media":26320,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[158],"tags":[1445,1444],"yoast_head":"\nB\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: Ch\u01b0\u01a1ng 1 (ph\u1ea7n 1)<\/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\/bai-tap-trac-nghiem-vat-li-12-chuong-1-phan-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: Ch\u01b0\u01a1ng 1 (ph\u1ea7n 1)\" \/>\n<meta property=\"og:description\" content=\"C\u00e2u 1:\u00a0M\u1ed9t ch\u1ea5t \u0111i\u1ec3m dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a tr\u00ean \u0111o\u1ea1n th\u1eb3ng MN d\u00e0i 12 cm v\u1edbi t\u1ea7n s\u1ed1 2 Hz, Ch\u1ecdn g\u1ed1c th\u1eddi gian l\u00e0 l\u00fac ch\u1ea5t \u0111i\u1ec3m c\u00f3 li \u0111\u1ed9 3\u221a3 cm v\u00e0 chuy\u1ec3n \u0111\u1ed9ng ng\u01b0\u1ee3c chi\u1ec1u v\u1edbi chi\u1ec1u d\u01b0\u01a1ng \u0111\u00e3 ch\u1ecdn. 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