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{"id":44102,"date":"2019-10-13T13:04:18","date_gmt":"2019-10-13T06:04:18","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=44102"},"modified":"2019-10-13T13:04:19","modified_gmt":"2019-10-13T06:04:19","slug":"giai-vat-li-10-bai-5-chuyen-dong-tron-deu","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/giai-vat-li-10-bai-5-chuyen-dong-tron-deu\/","title":{"rendered":"Gi\u1ea3i V\u1eadt L\u00ed 10 B\u00e0i 5: Chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u"},"content":{"rendered":"\n

B\u00e0i 5: Chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u<\/h2>\n\n\n\n

C1.<\/strong> ( trang 29 sgk V\u1eadt L\u00fd 10) H\u00e3y n\u00eau m\u1ed9t v\u00e0i v\u00ed d\u1ee5 v\u1ec1 chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u.<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\n

\u0110\u1ed1i v\u1edbi ng\u01b0\u1eddi quan s\u00e1t ng\u1ed3i tr\u00ean xe \u0111\u1ea1p \u0111ang ch\u1ea1y th\u1eb3ng \u0111\u1ec1u th\u00ec \u0111\u1ea7u \nvan b\u00e1nh xe chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u; \u0110i\u1ec3m \u0111\u1ea7u m\u00fat c\u1ee7a kim gi\u00e2y \u0111\u1ed3ng h\u1ed3 l\u00e0 \nchuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u\u2026<\/p>\n\n\n\n

C2.<\/strong> ( trang 30 sgk V\u1eadt L\u00fd 10) M\u1ed9t chi\u1ebfc \nxe \u0111\u1ea1p chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u tr\u00ean m\u1ed9t \u0111\u01b0\u1eddng tr\u00f2n b\u00e1n k\u00ednh 100m. Xe ch\u1ea1y m\u1ed9t \nv\u00f2ng h\u1ebft 2 ph\u00fat. T\u00ednh t\u1ed1c \u0111\u1ed9 d\u00e0i c\u1ee7a xe.<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\n

1 v\u00f2ng h\u1ebft 2 ph\u00fat = 120s \n<\/p>\n\n\n\n

\u21d2 Th\u1eddi gian quay xe \u0111i \u0111\u01b0\u1ee3c m\u1ed9t qu\u1ea3ng \u0111\u01b0\u1eddng b\u1eb1ng chu vi c\u1ee7a \u0111\u01b0\u1eddng tr\u00f2n l\u00e0: t = T = 120(s) (T \u0111\u01b0\u1ee3c g\u1ecdi chu k\u1ef3 quay)\n<\/p>\n\n\n\n

T\u1ed1c \u0111\u1ed9 d\u00e0i c\u1ee7a xe l\u00e0: \n<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

C3.<\/strong> ( trang 31 sgk V\u1eadt L\u00fd 10) C\u00f3 lo\u1ea1i \n\u0111\u1ed3ng h\u1ed3 treo t\u01b0\u1eddng m\u00e0 kim gi\u00e2y quay \u0111\u1ec1u li\u00ean t\u1ee5c. H\u00e3y t\u00ednh t\u1ed1c \u0111\u1ed9 g\u00f3c \nc\u1ee7a kim gi\u00e2y trong \u0111\u1ed3ng h\u1ed3 n\u00e0y.<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

C4.<\/strong> ( trang 31 sgk V\u1eadt L\u00fd 10) H\u00e3y ch\u1ee9ng minh c\u00f4ng th\u1ee9c <\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/p>\n\n\n\n

Theo \u0111\u1ecbnh ngh\u0129a t\u1ed1c \u0111\u1ed9 g\u00f3c: \n<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

X\u00e9t 1 v\u00f2ng tr\u00f2n c\u1ee7a chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u ta c\u00f3: \u0394\u03b1 = 2\u03c0\n<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

C5.<\/strong> ( trang 31 sgk V\u1eadt L\u00fd 10) H\u00e3y ch\u1ee9ng minh c\u00f4ng th\u1ee9c f = 1\/T.<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

C6.<\/strong> ( trang 31 sgk V\u1eadt L\u00fd 10) H\u00e3y t\u00ednh t\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a chi\u1ebfc xe \u0111\u1ea1p trong c\u00e2u C2.<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/p>\n\n\n\n

Ta c\u00f3 t\u1ed1c \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng: \n<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

\u21d2 T\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a xe \u0111\u1ea1p l\u00e0: \n<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

Ho\u1eb7c: \n<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

C7.<\/strong> ( trang 33 sgk V\u1eadt L\u00fd 10) H\u00e3y ch\u1ee9ng minh c\u00f4ng th\u1ee9c: aht<\/sub> = \u03c92<\/sup>R. <\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

B\u00e0i 11 (trang 34 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u1ed9t qu\u1ea1t m\u00e1y quay v\u1edbi t\u1ea7n s\u1ed1 400 v\u00f2ng\/ ph\u00fat. C\u00e1ch qu\u1ea1t d\u00e0i 0,8m. T\u00ednh t\u1ed1c \u0111\u1ed9 d\u00e0i v\u00e0 t\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a m\u1ed9t \u0111i\u1ec3m \u1edf \u0111\u1ea7u c\u00e1nh qu\u1ea1t.<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\n

Ta c\u00f3: \n <\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

T\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a m\u1ed9t \u0111i\u1ec3m b\u1ea5t k\u00ec \u1edf \u0111\u1ea7u c\u00e1nh qu\u1ea1t l\u00e0:\n<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

T\u1ed1c \u0111\u1ed9 d\u00e0i c\u1ee7a \u0111i\u1ec3m tr\u00ean \u0111\u1ea7u c\u00e1nh qu\u1ea1t l\u00e0: V = R.\u03c9 = 33,5 m\/s. <\/p>\n\n\n\n

<\/p>\n\n\n\n

B\u00e0i 12 (trang 34 SGK V\u1eadt L\u00fd 10) :<\/strong> B\u00e1nh xe\n \u0111\u1ea1p c\u00f3 \u0111\u01b0\u1eddng k\u00ednh 0,66 m. Xe \u0111\u1ea1p chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng \u0111\u1ec1u v\u1edbi v\u1eadn t\u1ed1c 12 \nkm\/h. T\u00ednh t\u1ed1c \u0111\u1ed9 d\u00e0i v\u00e0 t\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a m\u1ed9t \u0111i\u1ec3m tr\u00ean v\u00e0nh b\u00e1nh \u0111\u1ed1i v\u1edbi \nng\u01b0\u1eddi ng\u1ed3i tr\u00ean xe .<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\n

B\u00e1n k\u00ednh c\u1ee7a b\u00e1nh xe \u0111\u1ea1p l\u00e0: <\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

Khi xe \u0111\u1ea1p chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng \u0111\u1ec1u, m\u1ed9t \u0111i\u1ec3m M tr\u00ean v\u00e0nh b\u00e1nh xe \u0111\u1ed1i \nv\u1edbi ng\u01b0\u1eddi quan s\u00e1t ng\u1ed3i tr\u00ean xe ch\u1ec9 chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u. (\u0110\u1ed1i v\u1edbi m\u1eb7t \n\u0111\u1ea5t, \u0111i\u1ec3m M c\u00f2n tham gia chuy\u1ec3n \u0111\u1ed9ng t\u1ecbnh ti\u1ebfn) khi \u0111\u00f3 t\u1ed1c \u0111\u1ed9 d\u00e0i c\u1ee7a M \nb\u1eb1ng t\u1ed1c \u0111\u1ed9 d\u00e0i c\u1ee7a xe: v = 12 km\/h = 10\/3 m\/s.\n<\/p>\n\n\n\n

T\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a m\u1ed9t \u0111i\u1ec3m tr\u00ean v\u00e0nh b\u00e1nh \u0111\u1ed1i v\u1edbi ng\u01b0\u1eddi ng\u1ed3i tr\u00ean xe l\u00e0:\n<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

B\u00e0i 13 (trang 34 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u1ed9t \n\u0111\u1ed3ng h\u1ed3 treo t\u01b0\u1eddng c\u00f3 kim ph\u00fat d\u00e0i 10 cm v\u00e0 kim gi\u1edd d\u00e0i 8 cm. Cho r\u1eb1ng \nc\u00e1c kim quay \u0111\u1ec1u. T\u00ednh t\u1ed1c \u0111\u1ed9 d\u00e0i v\u00e0 t\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a \u0111i\u1ec3m \u0111\u1ea7u hai kim.<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\n

Kim ph\u00fat quay 1 v\u00f2ng \u0111\u01b0\u1ee3c 1h \u2192 Chu k\u00ec quay tr\u00f2n c\u1ee7a \u0111i\u1ec3m \u0111\u1ea7u kim ph\u00fat l\u00e0: Tp<\/sub> = 1h = 3600 s\n\n<\/p>\n\n\n\n

Kim gi\u1edd quay 1 v\u00f2ng h\u1ebft 12 h \u2192 Chu k\u00ec quay tr\u00f2n c\u1ee7a \u0111i\u1ec3m \u0111\u1ea7u kim gi\u1edd l\u00e0: Tg<\/sub> = 12h = 43200 s.\n<\/p>\n\n\n\n

\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c li\u00ean h\u1ec7 gi\u1eefa t\u1ed1 \u0111\u1ed9 d\u00e0i v\u00e0 t\u1ed1c \u0111\u1ed9 g\u00f3c: \n<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

Ta c\u00f3:\n<\/p>\n\n\n\n

\u2022 T\u1ed1c \u0111\u1ed9 d\u00e0i c\u1ee7a kim ph\u00fat l\u00e0: \n<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

\u2022\tT\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a kim ph\u00fat l\u00e0: \n<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

\u2022\tT\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a kim gi\u1edd l\u00e0: \n<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

T\u1ed1c \u0111\u1ed9 d\u00e0i c\u1ee7a kim gi\u1edd l\u00e0: \n<\/p>\n\n\n\n

Vg<\/sub> = Rg<\/sub>.\u03c9g<\/sub> = 0,08. 1,45.10-4<\/sup> = 0,116.10-4<\/sup> m\/s = 0,0116 mm\/s. <\/p>\n\n\n\n

B\u00e0i 14 (trang 34 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u1ed9t \n\u0111i\u1ec3m n\u1eb1m tr\u00ean v\u00e0nh ngo\u00e0i c\u1ee7a m\u1ed9t l\u1ed1p xe m\u00e1y c\u00e1ch tr\u1ee5c c\u1ee7a xe 30 cm. Xe \nchuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng \u0111\u1ec1u. H\u1ecfi b\u00e1nh xe ph\u1ea3i quay bao nhi\u00eau v\u00f2ng th\u00ec s\u1ed1 ch\u1ec9 \ntr\u00ean \u0111\u1ed3ng h\u1ed3 t\u1ed1c \u0111\u1ed9 c\u1ee7a xe s\u1ebd nh\u1ea3y m\u1ed9t s\u1ed1 \u1ee9ng v\u1edbi 1 km.<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\n

Khi b\u00e1nh xe quay \u0111\u01b0\u1ee3c m\u1ed9t v\u00f2ng th\u00ec xe \u0111i \u0111\u01b0\u1ee3c qu\u00e3ng \u0111\u01b0\u1eddng b\u1eb1ng chu vi\n c\u1ee7a b\u00e1nh xe. Qu\u00e3ng \u0111\u01b0\u1eddng m\u00e0 m\u1ed9t v\u00f2ng \u0111i \u0111\u01b0\u1ee3c l\u00e0 chu vi c\u1ee7a v\u00f2ng tr\u00f2n:\n<\/p>\n\n\n\n

\t\t\tS = C = 2\u03c0R = 2. 3,14. 0,3 = 1,884m.\n<\/p>\n\n\n\n

V\u1eady \u0111\u1ec3 \u0111i \u0111\u01b0\u1ee3c 1 km = 1000m th\u00ec b\u00e1nh xe ph\u1ea3i quay\n<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

B\u00e0i 15 (trang 34 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u1ed9t \nchi\u1ebfc t\u00e0u th\u1ee7y neo t\u1ea1i m\u1ed9t \u0111i\u1ec3m tr\u00ean \u0111\u01b0\u1eddng x\u00edch \u0111\u1ea1o. H\u00e3y t\u00ednh t\u1ed1c \u0111\u1ed9 g\u00f3c\n v\u00e0 t\u1ed1c \u0111\u1ed9 d\u00e0i c\u1ee7a t\u00e0u \u0111\u1ed1i v\u1edbi tr\u1ee5c quay c\u1ee7a Tr\u00e1i \u0110\u1ea5t . Bi\u1ebft b\u00e1n k\u00ednh \nc\u1ee7a Tr\u00e1i \u0110\u1ea5t l\u00e0 6400 km.<\/p>\n\n\n\n

L\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\n

B\u00e1n k\u00ednh c\u1ee7a Tr\u00e1i \u0110\u1ea5t l\u00e0: R = 6400 km = 6400000 m.\n<\/p>\n\n\n\n

Tr\u00e1i \u0111\u1ea5t quay m\u1ed9t v\u00f2ng quanh tr\u1ee5c h\u1ebft 24h \u2192 Chu k\u00ec quay c\u1ee7a 1 \u0111i\u1ec3m \nn\u1eb1m tr\u00ean \u0111\u01b0\u1eddng x\u00edch \u0111\u1ea1o quanh tr\u1ee5c Tr\u00e1i \u0110\u1ea5t l\u00e0: T = 24h = 24.3600 = \n86400 (s).\n<\/p>\n\n\n\n

T\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a t\u00e0u \u0111\u1ed1i v\u1edbi tr\u1ee5c quay c\u1ee7a Tr\u00e1i \u0110\u1ea5t l\u00e0:\n<\/p>\n\n\n\n

\"Gi\u1ea3i<\/figure>\n\n\n\n

T\u1ed1c \u0111\u1ed9 d\u00e0i c\u1ee7a t\u00e0u \u0111\u1ed1i v\u1edbi tr\u1ee5c quay c\u1ee7a Tr\u00e1i \u0110\u1ea5t l\u00e0: \n<\/p>\n\n\n\n

V = \u03c9.R = 7,3.10-5<\/sup>. 6400000 = 467,2 m\/s.\n<\/ins><\/p>\n","protected":false},"excerpt":{"rendered":"

B\u00e0i 5: Chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u C1. ( trang 29 sgk V\u1eadt L\u00fd 10) H\u00e3y n\u00eau m\u1ed9t v\u00e0i v\u00ed d\u1ee5 v\u1ec1 chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u. L\u1eddi gi\u1ea3i: \u0110\u1ed1i v\u1edbi ng\u01b0\u1eddi quan s\u00e1t ng\u1ed3i tr\u00ean xe \u0111\u1ea1p \u0111ang ch\u1ea1y th\u1eb3ng \u0111\u1ec1u th\u00ec \u0111\u1ea7u van b\u00e1nh xe chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u; \u0110i\u1ec3m \u0111\u1ea7u m\u00fat c\u1ee7a kim gi\u00e2y […]<\/p>\n","protected":false},"author":12,"featured_media":44103,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1640],"tags":[],"yoast_head":"\nGi\u1ea3i V\u1eadt L\u00ed 10 B\u00e0i 5: Chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u<\/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\/giai-vat-li-10-bai-5-chuyen-dong-tron-deu\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Gi\u1ea3i V\u1eadt L\u00ed 10 B\u00e0i 5: Chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 5: Chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u C1. 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