\n| T\u1ecda \u0111\u1ed9 g\u00f3c \u03c6<\/td>\n | T\u1ecda \u0111\u1ed9 x<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n <\/p>\n C\u00e2u 2 (trang 8 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0Vi\u1ebft c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh c\u1ee7a chuy\u1ec3n \u0111\u1ed9ng quay bi\u1ebfn \u0111\u1ed5i \u0111\u1ec1u c\u1ee7a v\u1eadt r\u1eafn quanh m\u1ed9t tr\u1ee5c c\u1ed1 \u0111\u1ecbnh.<\/span><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n T\u1ed1c \u0111\u1ed9 g\u00f3c: \u03c9 = \u03c9o<\/sub>\u00a0+ \u03d2t<\/p>\nT\u1ecda \u0111\u1ed9 g\u00f3c: \u03c6= \u03c6o<\/sub>\u00a0+ \u03c9o<\/sub>\u00a0+ 1\/2\u03d2t2<\/sup><\/p>\nLi\u00ean h\u1ec7: \u03c92<\/sup>\u00a0– \u03c9o<\/sub>2<\/sup>\u00a0= 2 \u03d2\u03c6<\/p>\nC\u00e2u 3 (trang 8 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0Vi\u1ebft c\u00f4ng th\u1ee9c t\u00ednh gia t\u1ed1c ti\u1ebfp tuy\u1ebfn, gia t\u1ed1c h\u01b0\u1edbng t\u00e2m c\u1ee7a m\u1ed9t \u0111i\u1ec3m chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n kh\u00f4ng \u0111\u1ec1u.<\/span><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n Gia t\u1ed1c ti\u1ebfp tuy\u1ebfn: at<\/sub>\u00a0= r\u03d2<\/p>\nGia t\u1ed1c h\u01b0\u1edbng t\u00e2m: a = (v2<\/sup>)\/R<\/p>\nGia t\u1ed1c to\u00e0n ph\u1ea7n c\u1ee7a m\u1ed9t \u0111i\u1ec3m:<\/p>\n ![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-60.png\") <\/p>\n
B\u00c0I T\u1eacP<\/strong><\/p>\nB\u00e0i 1 (trang 9 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0M\u1ed9t c\u00e1nh qu\u1ea1t d\u00e0i 20cm, quay v\u1edbi t\u1ed1c \u0111\u1ed9 g\u00f3c kh\u00f4ng \u0111\u1ed5i l\u00e0 \u03c9= rad\/s. T\u1ed1c \u0111\u1ed9 d\u00e0i c\u1ee7a m\u1ed9t \u0111i\u1ec3m \u1edf v\u00e0nh c\u00e1nh qu\u1ea1t b\u1eb1ng.<\/span><\/p>\nA 37,6 m\/s.\u00a0\u00a0\u00a0B. 23,5 m\/s.<\/p>\n C. 18,8 m\/s.\u00a0\u00a0\u00a0D. 47 m\/s.<\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n Ch\u1ecdn C. T\u1ed1c \u0111\u1ed9 d\u00e0i V = \u03c9R= 94.0,2 = 18,8m\/s<\/p>\n B\u00e0i 2 (trang 9 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0Hai h\u1ecdc sinh A v\u00e0 B \u0111\u1ee9ng tr\u00ean chi\u1ebfc \u0111u quay tr\u00f2n. A \u1edf ngo\u00e0i ria. B \u1edf c\u00e1ch t\u00e2m m\u1ed9t \u0111o\u1ea1n b\u1eb1ng n\u1eeda b\u00e1n k\u00ednh c\u1ee7a \u0111u. G\u1ecdi \u03c9A, \u03c9B, \u03b3A , \u03b3B l\u1ea7n l\u01b0\u1ee3t l\u00e0 t\u1ed1c \u0111\u1ed9 g\u00f3c v\u00e0 gia t\u1ed1c g\u00f3c cua A v\u00e0 B. K\u1ebft lu\u1eadn n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang?<\/span><\/p>\nA. \u03c9A<\/sub>\u00a0= \u03c9B<\/sub>, \u03b3A<\/sub>\u00a0= \u03b3B<\/sub>\u00a0\u00a0\u00a0B. \u03c9A<\/sub>\u00a0> \u03c9B<\/sub>, \u03b3A<\/sub>\u00a0>\u03b3B<\/sub><\/p>\nC. \u03c9A<\/sub>\u00a0> \u03c9B<\/sub>, \u03b3A<\/sub>\u00a0= 2\u03b3B<\/sub>\u00a0\u00a0\u00a0D. \u03c9A<\/sub>\u00a0= \u03c9B<\/sub>, \u03b3A<\/sub>\u00a0> \u03b3B<\/sub><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n Ch\u1ecdn A.<\/p>\n T\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a m\u1ecdi \u0111i\u1ec3m khi chuy\u1ec3n \u0111\u1ed9ng quay l\u00e0 nh\u01b0 nhau n\u00ean \u03c9A<\/sub>\u00a0= \u03c9B<\/sub>, v\u00e0 gia t\u1ed1c g\u00f3c c\u1ee7a c\u00e1c \u0111i\u1ec3m \u03b3 = d\u03c9\/dt , v\u1eady gia t\u1ed1c g\u00f3c c\u0169ng lu\u00f4n b\u1eb1ng nhau \u03b3A<\/sub>\u00a0= \u03b3B<\/sub>.<\/p>\nB\u00e0i 3 (trang 9 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0M\u1ed9t \u0111i\u1ec3m \u1edf tr\u00ean v\u1eadt r\u1eafn c\u00e1ch tr\u1ee5c quay m\u1ed9t kho\u1ea3ng R. Khi v\u1eadt r\u1eafn quay \u0111\u1ec1u quanh tr\u1ee5c, \u0111i\u1ec3m \u0111\u00f3 c\u00f3 to\u1ea1 \u0111\u1ed9 d\u00e0i l\u00e0 v. T\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a v\u1eadt r\u1eafn l\u00e0:<\/span><\/p>\n![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-61.png\") <\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n Ch\u1ecdn A. T\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a v\u1eadt r\u1eafn l\u00e0: \u03c9 = v\/R<\/p>\n B\u00e0i 4 (trang 9 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0B\u00e1nh \u0111\u00e0 c\u1ee7a m\u1ed9t \u0111\u1ed9ng c\u01a1 t\u1eeb l\u00fac kh\u1edfi \u0111\u1ed9ng \u0111\u1ebfn l\u00fac \u0111\u1ea1t t\u1ed1c \u0111\u1ed9 g\u00f3c 140 rad\/s ph\u1ea3i m\u1ea5t 2s. Bi\u1ebft \u0111\u1ed9ng c\u01a1 quay nhanh d\u1ea7n \u0111\u1ec1u. G\u00f3c quay c\u1ee7a b\u00e1nh \u0111\u00e0 trong th\u1eddi gian tr\u00ean b\u1eb1ng:<\/span><\/p>\nA 140 rad.\u00a0\u00a0\u00a0B. 70 rad.<\/p>\n C. 35 rad.\u00a0\u00a0\u00a0D. 35\u03c0 rad.<\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n T\u1ed1c \u0111\u1ed9 g\u00f3c:<\/p>\n ![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-62.png\") <\/p>\n
G\u00f3c quay:<\/p>\n ![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/2-23.png\") <\/p>\n
B\u00e0i 5 (trang 9 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0M\u1ed9t b\u00e1nh xe quay nhanh d\u1ea7n \u0111\u1ec1u quanh tr\u1ee5c. L\u00fac t = 0 b\u00e1nh xe c\u00f3 t\u1ed1c \u0111\u1ed9 g\u00f3c 5 rad\/s. Sau 5s, t\u1ed1c \u0111\u1ed9 g\u00f3c c\u1ee7a n\u00f3 t\u0103ng l\u00ean \u0111\u1ebfn 7 rad\/s. Gia t\u1ed1c g\u00f3c c\u1ee7a b\u00e1nh xe l\u00e0:<\/span><\/p>\nA. 0,2 rad\/s2<\/sup>\u00a0\u00a0\u00a0B. 0,4 rad\/s2<\/sup>.<\/p>\nC. 2,4 rad\/s2<\/sup>\u00a0\u00a0\u00a0D. 0,8 rad\/s2<\/sup>.<\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n Ch\u1ecdn B.<\/p>\n T\u1eeb c\u00f4ng th\u1ee9c t\u1ed1c \u0111\u1ed9 g\u00f3c:<\/p>\n ![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-63.png\") <\/p>\n","protected":false},"excerpt":{"rendered":"
C\u00c2U H\u1eceI C\u00e2u 1 (trang 8 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):\u00a0N\u00eau s\u1ef1 t\u01b0\u01a1ng \u1ee9ng gi\u1eefa c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng g\u00f3c trong chuy\u1ec3n \u0111\u1ed9ng quay v\u00e0 c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng. L\u1eddi gi\u1ea3i: Chuy\u1ec3n \u0111\u1ed9ng quay Chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng Gia t\u1ed1c g\u00f3c \u03d2 Gia t\u1ed1c a T\u1ed1c \u0111\u1ed9 g\u00f3c \u03c9 T\u1ed1c \u0111\u1ed9 v T\u1ecda \u0111\u1ed9 […]<\/p>\n","protected":false},"author":3,"featured_media":25339,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1304],"tags":[1432,1431],"yoast_head":"\n Ch\u01b0\u01a1ng 1 - B\u00e0i 1: Chuy\u1ec3n \u0111\u1ed9ng quay c\u1ee7a v\u1eadt r\u1eafn quanh m\u1ed9t tr\u1ee5c c\u1ed1 \u0111\u1ecbnh<\/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\/chuong-1-bai-1-chuyen-dong-quay-cua-vat-ran-quanh-mot-truc-co-dinh\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ch\u01b0\u01a1ng 1 - B\u00e0i 1: Chuy\u1ec3n \u0111\u1ed9ng quay c\u1ee7a v\u1eadt r\u1eafn quanh m\u1ed9t tr\u1ee5c c\u1ed1 \u0111\u1ecbnh\" \/>\n<meta property=\"og:description\" content=\"C\u00c2U H\u1eceI C\u00e2u 1 (trang 8 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):\u00a0N\u00eau s\u1ef1 t\u01b0\u01a1ng \u1ee9ng gi\u1eefa c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng g\u00f3c trong chuy\u1ec3n \u0111\u1ed9ng quay v\u00e0 c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng. 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