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{"id":44129,"date":"2019-10-13T13:29:52","date_gmt":"2019-10-13T06:29:52","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=44129"},"modified":"2019-10-13T13:29:53","modified_gmt":"2019-10-13T06:29:53","slug":"giai-vat-li-10-bai-14-luc-huong-tam","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/giai-vat-li-10-bai-14-luc-huong-tam\/","title":{"rendered":"Gi\u1ea3i V\u1eadt L\u00ed 10 B\u00e0i 14 : L\u1ef1c h\u01b0\u1edbng t\u00e2m"},"content":{"rendered":"\n

B\u00e0i 14 : L\u1ef1c h\u01b0\u1edbng t\u00e2m<\/h2>\n\n\n\n

C1.<\/strong> ( trang 75 sgk V\u1eadt L\u00fd 10):<\/p>\n\n\n\n

a) L\u1ef1c n\u00e0o \u0111\u00e3 g\u00e2y ra gia t\u1ed1c h\u01b0\u1edbng t\u00e2m cho v\u1eadt?<\/p>\n\n\n\n

b) T\u1ea1i sao khi b\u00e0n quay nhanh \u0111\u1ebfn m\u1ed9t m\u1ee9c n\u00e0o \u0111\u00f3 th\u00ec v\u1eadt s\u1ebd v\u0103ng ra ngo\u00e0i b\u00e0n?<\/p>\n\n\n\n

Tr\u1ea3 l\u1eddi:<\/strong><\/ins><\/p>\n\n\n\n

a)\tL\u1ef1c h\u1ea5p d\u1eabn g\u00e2y ra gia t\u1ed1c h\u01b0\u1edbng t\u00e2m cho c\u00e1c v\u1ec7 tinh, h\u00e0nh tinh \nchuy\u1ec3n \u0111\u1ed9ng xung quanh Tr\u00e1i \u0110\u1ea5t, xung quanh M\u1eb7t Tr\u1eddi. M\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p \nl\u1ef1c ma s\u00e1t ngh\u1ec9 \u0111\u00f3ng vai tr\u00f2 l\u00e0 l\u1ef1c h\u01b0\u1edbng t\u00e2m.<\/p>\n\n\n\n

b) N\u1ebfu b\u00e0n quay nhanh \u0111\u1ebfn m\u1ed9t t\u1ed1c \u0111\u1ed9 n\u00e0o \u0111\u00f3 th\u00ec \u0111\u1ed9 l\u1edbn c\u1ee7a l\u1ef1c ma s\u00e1t ngh\u1ec9 c\u1ef1c \u0111\u1ea1i nh\u1ecf h\u01a1n \u0111\u1ed9 l\u1edbn c\u1ee7a l\u1ef1c h\u01b0\u1edbng t\u00e2m c\u1ea7n thi\u1ebft n\u00ean v\u1eadt tr\u01b0\u1ee3t tr\u00ean b\u00e0n ra xa t\u00e2m quay, v\u0103ng ra ngo\u00e0i.<\/p>\n\n\n\n

B\u00e0i 4 (trang 82 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u1ed9t v\u1eadt \nc\u00f3 kh\u1ed1i l\u01b0\u1ee3ng m = 20 g \u0111\u1eb7t \u1edf m\u00e9p m\u1ed9t chi\u1ebfc b\u00e0n quay. H\u1ecfi ph\u1ea3i quay b\u00e0n \nv\u1edbi t\u1ea7n s\u1ed1 v\u00f2ng l\u1edbn nh\u1ea5t b\u1eb1ng bao nhi\u00eau \u0111\u1ec3 v\u1eadt kh\u00f4ng v\u0103ng ra kh\u1ecfi b\u00e0n? \nCho bi\u1ebft m\u1eb7t b\u00e0n h\u00ecnh tr\u00f2n, b\u00e1n k\u00ednh 1 m. L\u1ef1c ma s\u00e1t ngh\u1ec9 c\u1ef1c \u0111\u1ea1i b\u1eb1ng \n0,08 N.<\/p>\n\n\n\n

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

\u0110\u1ec3 v\u1eadt kh\u00f4ng b\u1ecb v\u0103ng ra ngo\u00e0i kh\u1ecfi b\u00e0n th\u00ec: Fht<\/sub> \u2264 Fmsn (max)<\/sub> \n<\/p>\n\n\n\n

(Khi Fmsn (max)<\/sub> \u2264 Fht<\/sub> th\u00ec v\u1eadt b\u1ecb v\u0103ng)\n<\/p>\n\n\n\n

L\u1ef1c h\u01b0\u1edbng t\u00e2m t\u00e1c d\u1ee5ng v\u00e0o v\u1eadt:\n<\/p>\n\n\n\n

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

(f l\u00e0 t\u1ea7n s\u1ed1 quay c\u1ee7a b\u00e0n)\n<\/p>\n\n\n\n

\u0110\u1ec3 v\u1eadt kh\u00f4ng b\u1ecb v\u0103ng ra kh\u1ecfi m\u1eb7t b\u00e0n ta c\u00f3:\n<\/p>\n\n\n\n

Fht<\/sub> \u2264 Fmsn<\/sub> \u21d4 8.10-2<\/sup>. 9,8596. f2<\/sup> \u2264 8.10-2<\/sup>\n<\/p>\n\n\n\n

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

B\u00e0i 5 (trang 83 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u1ed9t \u00f4 t\u00f4\n c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 1200 kg chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u qua m\u1ed9t \u0111o\u1ea1n c\u1ea7u v\u01b0\u1ee3t (coi l\u00e0 \ncung tr\u00f2n) v\u1edbi t\u1ed1c \u0111\u1ed9 36 km\/h. H\u1ecfi \u00e1p l\u1ef1c c\u1ee7a \u00f4 t\u00f4 v\u00e0o m\u1eb7t \u0111\u01b0\u1eddng t\u1ea1i \n\u0111i\u1ec3m cao nh\u1ea5t (H\u00ecnh 14.7) b\u1eb1ng bao nhi\u00eau? Bi\u1ebft b\u00e1n k\u00ednh cong c\u1ee7a \u0111o\u1ea1n \nc\u1ea7u v\u01b0\u1ee3t l\u00e0 50 m. L\u1ea5y g = 10 m\/s2<\/sup> .<\/ins><\/p>\n\n\n\n

A.\t11760 N ;        B. 11950 N <\/p>\n\n\n\n

C. 14400N ;        D. 9600 N<\/p>\n\n\n\n

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

Ch\u1ecdn D\n<\/p>\n\n\n\n

v = 36 km\/h = 10m\/s\n<\/p>\n\n\n\n

H\u1ee3p l\u1ef1c c\u1ee7a tr\u1ecdng l\u1ef1c P v\u00e0 ph\u1ea3n l\u1ef1c N c\u1ee7a m\u1eb7t c\u1ea7u v\u1ed3ng t\u1ea1o ra l\u1ef1c h\u01b0\u1edbng t\u00e2m:\n<\/p>\n\n\n\n

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

Ch\u1ecdn chi\u1ec1u d\u01b0\u01a1ng c\u1ee7a tr\u1ee5c t\u1ecda \u0111\u1ed9 h\u01b0\u1edbng theo chi\u1ec1u c\u1ee7a P. Chi\u1ebfu bi\u1ec3u th\u1ee9c (1) l\u00ean tr\u1ee5c \u0111\u00e3 ch\u1ecdn ta \u0111\u01b0\u1ee3c:\n<\/p>\n\n\n\n

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

B\u00e0i 6 (trang 83 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u1ed9t v\u1ec7 tinh nh\u00e2n t\u1ea1o bay quanh Tr\u00e1i \u0110\u1ea5t \u1edf \u0111\u1ed9 cao h b\u1eb1ng b\u00e1n k\u00ednh R c\u1ee7a Tr\u00e1i \u0110\u1ea5t. Cho R = 6400 km v\u00e0 l\u1ea5y g = 10 m\/s2<\/sup> . H\u00e3y t\u00ednh t\u1ed1c \u0111\u1ed9 v\u00e0 chu k\u00ec quay c\u1ee7a v\u1ec7 tinh.<\/p>\n\n\n\n

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

L\u1ef1c h\u1ea5p d\u1eabn gi\u1eefa v\u1ec7 tinh v\u00e0 Tr\u00e1i \u0110\u1ea5t \u0111\u00f3ng vai tr\u00f2 l\u00e0 l\u1ef1c h\u01b0\u1edbng t\u00e2m, ta c\u00f3: Fhd<\/sub> = Fht<\/sub> \n<\/p>\n\n\n\n

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

(B\u00e1n k\u00ednh qu\u1ef9 \u0111\u1ea1o tr\u00f2n c\u1ee7a v\u1ec7 tinh t\u1eeb v\u1ec7 tinh \u0111\u1ebfn t\u00e2m Tr\u00e1i \u0110\u1ea5t: R + h)\n<\/p>\n\n\n\n

M\u1eb7t kh\u00e1c: \n<\/p>\n\n\n\n

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

(M l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng tr\u00e1i \u0111\u1ea5t)\n<\/p>\n\n\n\n

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

B\u00e0i 7 (trang 83 SGK V\u1eadt L\u00fd 10) :<\/strong> H\u00e3y gi\u1ea3i th\u00edch c\u00e1c chuy\u1ec7n \u0111\u1ed9ng sau \u0111\u00e2y b\u1eb1ng chuy\u1ec3n \u0111\u1ed9ng li t\u00e2m:<\/p>\n\n\n\n

a)\tCho rau \u0111\u00e3 r\u1eeda v\u00e0o r\u1ed5 r\u1ed3i v\u1ea9y m\u1ed9t l\u00fac thi rau r\u00e1o n\u01b0\u1edbc.<\/ins><\/p>\n\n\n\n

b)\tTh\u00f9ng gi\u1eb7t qu\u1ea7n \u00e1o c\u1ee7a m\u00e1y gi\u1eb7t c\u00f3 nhi\u1ec1u l\u1ed7 th\u1ee7ng nh\u1ecf \u1edf th\u00e0nh xung\n quanh (H\u00ecnh 14.8). \u1ede c\u00f4ng \u0111o\u1ea1n v\u1eaft n\u01b0\u1edbc, van x\u1ea3 n\u01b0\u1edbc m\u1edf ra v\u00e0 th\u00f9ng \nquay nhanh l\u00e0m qu\u1ea7n \u00e1o r\u00e1o n\u01b0\u1edbc.<\/p>\n\n\n\n

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

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

a)\tKhi v\u1ea9y rau, n\u01b0\u1edbc v\u00e0 rau chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n (m\u1ed9t cung tr\u00f2n). N\u1ebfu v\u1ea9y\n nhanh, l\u1ef1c li\u00ean k\u1ebft gi\u1eefa n\u01b0\u1edbc v\u00e0 rau nh\u1ecf h\u01a1n l\u1ef1c h\u01b0\u1edbng t\u00e2m c\u1ea7n thi\u1ebft. \nM\u1eb7t kh\u00e1c rau th\u00ec \u0111\u01b0\u1ee3c r\u1ed5 gi\u1eef l\u1ea1i, do \u0111\u00f3 c\u00e1c gi\u1ecdt n\u01b0\u1edbc v\u0103ng \u0111i.\n<\/p>\n\n\n\n

b)\tKhi th\u00f9ng gi\u1eb7t quay nhanh, l\u1ef1c li\u00ean k\u1ebft gi\u1eefa n\u01b0\u1edbc v\u00e0 v\u00e0i nh\u1ecf h\u01a1n \nl\u1ef1c h\u01b0\u1edbng t\u00e2m c\u1ea7n thi\u1ebft, khi \u0111\u00f3 n\u01b0\u1edbc t\u00e1ch ra kh\u1ecfi v\u1ea3i v\u00e0 v\u0103ng ra ngo\u00e0i \nqua l\u1ed7 l\u01b0\u1edbi c\u1ee7a th\u00f9ng gi\u1eb7t.\n<\/ins><\/p>\n","protected":false},"excerpt":{"rendered":"

B\u00e0i 14 : L\u1ef1c h\u01b0\u1edbng t\u00e2m C1. ( trang 75 sgk V\u1eadt L\u00fd 10): a) L\u1ef1c n\u00e0o \u0111\u00e3 g\u00e2y ra gia t\u1ed1c h\u01b0\u1edbng t\u00e2m cho v\u1eadt? b) T\u1ea1i sao khi b\u00e0n quay nhanh \u0111\u1ebfn m\u1ed9t m\u1ee9c n\u00e0o \u0111\u00f3 th\u00ec v\u1eadt s\u1ebd v\u0103ng ra ngo\u00e0i b\u00e0n? Tr\u1ea3 l\u1eddi: a) L\u1ef1c h\u1ea5p d\u1eabn g\u00e2y ra gia t\u1ed1c […]<\/p>\n","protected":false},"author":12,"featured_media":44130,"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 14 : L\u1ef1c h\u01b0\u1edbng t\u00e2m<\/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-14-luc-huong-tam\/\" \/>\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 14 : L\u1ef1c h\u01b0\u1edbng t\u00e2m\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 14 : L\u1ef1c h\u01b0\u1edbng t\u00e2m C1. ( trang 75 sgk V\u1eadt L\u00fd 10): a) L\u1ef1c n\u00e0o \u0111\u00e3 g\u00e2y ra gia t\u1ed1c h\u01b0\u1edbng t\u00e2m cho v\u1eadt? b) T\u1ea1i sao khi b\u00e0n quay nhanh \u0111\u1ebfn m\u1ed9t m\u1ee9c n\u00e0o \u0111\u00f3 th\u00ec v\u1eadt s\u1ebd v\u0103ng ra ngo\u00e0i b\u00e0n? 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( trang 75 sgk V\u1eadt L\u00fd 10): a) L\u1ef1c n\u00e0o \u0111\u00e3 g\u00e2y ra gia t\u1ed1c h\u01b0\u1edbng t\u00e2m cho v\u1eadt? b) T\u1ea1i sao khi b\u00e0n quay nhanh \u0111\u1ebfn m\u1ed9t m\u1ee9c n\u00e0o \u0111\u00f3 th\u00ec v\u1eadt s\u1ebd v\u0103ng ra ngo\u00e0i b\u00e0n? 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