<\/ins><\/p>\n\n\n\n\u2217 Th\u00ed nghi\u1ec7m 2: Th\u1ea3 vi\u00ean gi\u1ea5y vo tr\u00f2n, n\u00e9n ch\u1eb7t v\u00e0 h\u00f2n s\u1ecfi.<\/p>\n\n\n\n
\u2217 Th\u00ed nghi\u1ec7m 3: Th\u1ea3 hai t\u1edd gi\u1ea5y c\u00f9ng k\u00edch th\u01b0\u1edbc, nh\u01b0ng m\u1ed9t t\u1edd gi\u1ea5y \u0111\u1ec3 ph\u1eb3ng c\u00f2n t\u1edd kia th\u00ec vo tr\u00f2n v\u00e0 n\u00e9n ch\u1eb7t l\u1ea1i.<\/p>\n\n\n\n
\u2217 Th\u00ed nghi\u1ec7m 4: Th\u1ea3 h\u00f2n bi s\u1eaft (trong l\u00edp c\u1ee7a xe \u0111\u1ea1p) v\u00e0 m\u1ed9t t\u1ea5m ph\u1eb3ng \u0111\u1eb7t n\u1eb1m ngang.<\/p>\n\n\n\n
– Trong th\u00ed nghi\u1ec7m n\u00e0o v\u1eadt n\u1eb7ng r\u01a1i nhanh h\u01a1n v\u1eadt nh\u1eb9?<\/p>\n\n\n\n
– Trong th\u00ed nghi\u1ec7m n\u00e0o v\u1eadt nh\u1eb9 r\u01a1i nhanh h\u01a1n v\u1eadt n\u1eb7ng?<\/p>\n\n\n\n
– Trong th\u00ed nghi\u1ec7m n\u00e0o hai v\u1eadt n\u1eb7ng nh\u01b0 nhau l\u1ea1i r\u01a1i nhanh, ch\u1eadm kh\u00e1c nhau?<\/p>\n\n\n\n
– Trong th\u00ed nghi\u1ec7m n\u00e0o hai v\u1eadt n\u1eb7ng, nh\u1eb9 kh\u00e1c nhau l\u1ea1i r\u01a1i nhanh nh\u01b0 nhau?<\/p>\n\n\n\n
Tr\u1ea3 l\u1eddi:<\/strong><\/ins><\/p>\n\n\n\n\u2217 Trong th\u00ed nghi\u1ec7m 1: Th\u1ea3 m\u1ed9t t\u1edd gi\u1ea5y v\u00e0 m\u1ed9t h\u00f2n s\u1ecfi : h\u00f2n s\u1ecfi r\u01a1i nhanh h\u01a1n (v\u1eadt n\u1eb7ng r\u01a1i nhanh h\u01a1n v\u1eadt nh\u1eb9).<\/p>\n\n\n\n
\u2217 Th\u00ed nghi\u1ec7m 4: V\u1eadt nh\u1eb9 r\u01a1i nhanh h\u01a1n v\u1eadt n\u1eb7ng (h\u00f2n bi nh\u1ecf r\u01a1i nhanh h\u01a1n m\u1ed9t t\u1ea5m b\u00eca ph\u1eb3ng \u0111\u1eb7t n\u1eb1m ngang).<\/p>\n\n\n\n
\u2217 Th\u00ed nghi\u1ec7m 3: Hai v\u1eadt n\u1eb7ng nh\u01b0 nhau l\u1ea1i r\u01a1i nhanh \u2013 ch\u1eadm kh\u00e1c nhau.<\/p>\n\n\n\n
\u2217 Th\u00ed nghi\u1ec7m 2: Hai v\u1eadt n\u1eb7ng \u2013 nh\u1eb9 kh\u00e1c nhau l\u1ea1i r\u01a1i nhanh nh\u01b0 nhau.<\/p>\n\n\n\n
C2.<\/strong>( trang 25 sgk V\u1eadt L\u00fd 10) S\u1ef1 r\u01a1i c\u1ee7a nh\u1eefng v\u1eadt n\u00e0o trong b\u1ed1n th\u00ed nghi\u1ec7m m\u00e0 ta \u0111\u00e3 l\u00e0m \u1edf tr\u00ean th\u1ebf coi l\u00e0 s\u1ef1 r\u01a1i t\u1ef1 do?<\/p>\n\n\n\nTr\u1ea3 l\u1eddi:<\/strong><\/p>\n\n\n\nS\u1ef1 r\u01a1i c\u1ee7a h\u00f2n s\u1ecfi, h\u00f2n bi xe \u0111\u1ea1p, vi\u00ean gi\u1ea5y vo tr\u00f2n l\u00e0 s\u1ef1 r\u01a1i t\u1ef1 do.\n V\u00ec nh\u1eefng v\u1eadt n\u00e0y ch\u1ecbu s\u1ee9c c\u1ea3n c\u1ee7a kh\u00f4ng kh\u00ed kh\u00f4ng \u0111\u00e1ng k\u1ec3 so v\u1edbi tr\u1ecdng \nl\u1ef1c.\n<\/p>\n\n\n\n
C3.<\/strong>( trang 26 sgk V\u1eadt L\u00fd 10) Ph\u01b0\u01a1ng c\u1ee7a\n chuy\u1ec3n \u0111\u1ed9ng r\u01a1i t\u1ef1 do l\u00e0 ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng. L\u00e0m th\u00ed nghi\u1ec7m n\u00e0o \u0111\u1ec3 x\u00e1c \n\u0111\u1ecbnh \u0111i\u1ec1u kh\u1eb3ng \u0111\u1ecbnh n\u00e0y?<\/p>\n\n\n\nTr\u1ea3 l\u1eddi:<\/strong><\/p>\n\n\n\nM\u1ed9t qu\u1ea3 c\u1ea9u nh\u1ecf, n\u1eb7ng (th\u01b0\u1eddng b\u1eb1ng ch\u00ec) \u0111\u01b0\u1ee3c treo b\u1eb1ng s\u1ee3i d\u00e2y m\u1ea3nh. Khi qu\u1ea3 c\u1ea7u n\u1eb1m c\u00e2n b\u1eb1ng, ph\u01b0\u01a1ng s\u1ee3i d\u00e2y l\u00e0 th\u1eb3ng \u0111\u1ee9ng chu\u1ea9n nh\u1ea5t. Th\u1ea3 v\u1eadt r\u01a1i t\u1ef1 do d\u1ecdc theo v\u00e0 s\u00e1t s\u1ee3i d\u00e2y, ta s\u1ebd th\u1ea5y ph\u01b0\u01a1ng r\u01a1i l\u00e0 ph\u01b0\u01a1ng s\u1ee3i d\u00e2y d\u1ecdi. <\/p>\n\n\n\n
B\u00e0i 9 (trang 27 SGK V\u1eadt L\u00fd 10) :<\/strong> Th\u1ea3 m\u1ed9t \nh\u00f2n \u0111\u00e1 t\u1eeb m\u1ed9t \u0111\u1ed9 cao h xu\u1ed1ng \u0111\u1ea5t. H\u00f2n \u0111\u00e1 r\u01a1i trong 1 s. N\u1ebfu th\u1ea3 h\u00f2n \u0111\u00e1 \n\u0111\u00f3 t\u1eeb \u0111\u1ed9 cao 4 h xu\u1ed1ng \u0111\u1ea5t th\u00ec h\u00f2n \u0111\u00e1 r\u01a1i trong bao l\u00e2u?<\/p>\n\n\n\nL\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\nCh\u1ecdn B<\/strong>. <\/p>\n\n\n\nG\u1ecdi t l\u00e0 th\u1eddi gian v\u1eadt r\u01a1i h\u1ebft \u0111\u1ed9 cao h.<\/p>\n\n\n\n
Ta c\u00f3:<\/p>\n\n\n\nV\u00ec v\u1eadt r\u01a1i t\u1eeb \u0111\u1ed9 cao h xu\u1ed1ng \u0111\u1ea5t h\u1ebft 1s n\u00ean suy ra t’ = 2.1 = 2s.<\/p>\n\n\n\n
<\/p>\n\n\n\n
B\u00e0i 10 (trang 27 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u1ed9t v\u1eadt n\u1eb7ng r\u01a1i t\u1eeb \u0111\u1ed9 cao 20 m xu\u1ed1ng \u0111\u1ea5t. T\u00ednh th\u1eddi gian r\u01a1i, v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt khi ch\u1ea1m \u0111\u1ea5t. L\u1ea5y g = 10 m\/s2<\/sup> .<\/p>\n\n\n\nL\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\nTh\u1eddi gian m\u00e0 v\u1eadt n\u1eb7ng r\u01a1i t\u1eeb \u0111\u1ed9 cao 20m l\u00e0:<\/p>\n\n\n\n
\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c:<\/p>\n\n\n\nB\u00e0i 11 (trang 27 SGK V\u1eadt L\u00fd 10) :<\/strong> Th\u1ea3 m\u1ed9t\n h\u00f2n \u0111\u00e1 r\u01a1i t\u1eeb mi\u1ec7ng m\u1ed9t c\u00e1i hang s\u00e2u xu\u1ed1ng \u0111\u1ebfn \u0111\u00e1y. Sau 4 s k\u1ec3 t\u1eeb l\u00fac \nb\u1eaft \u0111\u1ea7u th\u1ea3 th\u00ec nghe ti\u1ebfng h\u00f2n \u0111\u00e1 ch\u1ea1m v\u00e0o \u0111\u00e1y. T\u00ednh chi\u1ec1u s\u00e2u c\u1ee7a hang.\n Bi\u1ebft v\u1eadn t\u1ed1c truy\u1ec1n \u00e2m trong kh\u00f4ng kh\u00ed l\u00e0 330 m\/s. L\u1ea5y g = 9,8 m\/s2<\/sup>.<\/p>\n\n\n\nL\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\nGiai \u0111o\u1ea1n 1:\n<\/p>\n\n\n\n
V\u1eadt r\u01a1i t\u1ef1 do t\u1ee9c v\u1eadt chuy\u1ec3n \u0111\u1ed9ng nhanh d\u1ea7n \u0111\u1ec1u trong hang s\u00e2u \n<\/p>\n\n\n\n
\u2192 Th\u1eddi gian v\u1eadt r\u01a1i t\u1ef1 do h\u1ebft chi\u1ec1u s\u00e2u c\u1ee7a hang l\u00e0: \n<\/p>\n\n\n\n(h l\u00e0 chi\u1ec1u s\u00e2u c\u1ee7a hang).\n<\/p>\n\n\n\n
Giai \u0111o\u1ea1n 2: Khi \u0111\u00e1 ch\u1ea1m v\u00e0o \u0111\u00e1y, s\u00f3ng \u00e2m thanh do va ch\u1ea1m s\u1ebd truy\u1ec1n \nth\u1eb3ng \u0111\u1ec1u l\u00ean tr\u00ean \u2192 th\u1eddi gian \u00e2m thanh chuy\u1ec1n t\u1eeb \u0111\u00e1y l\u00ean mi\u1ec7ng hang l\u00e0:\n \n<\/p>\n\n\n\nTheo \u0111\u1ec1 b\u00e0i kho\u1ea3ng th\u1eddi gian t\u1eeb l\u00fac b\u1eaft \u0111\u1ea7u th\u1ea3 \u0111\u1ebfn l\u00fac nghe th\u1ea5y ti\u1ebfng l\u00e0 t = 4s n\u00ean ta c\u00f3: t = t1<\/sub> + t2<\/sub> = 4s\n<\/p>\n\n\n\n(s\u1eed d\u1ee5ng ch\u1ee9c n\u0103ng SLOVE trong m\u00e1y t\u00ednh Casio fx 570 VN Plus ta gi\u1ea3i nhanh \u0111\u01b0\u1ee3c h)\n<\/p>\n\n\n\n
(ta c\u00f3 th\u1ec3 ph\u01b0\u01a1ng tr\u00ecnh tr\u00ean t\u00ecm h b\u1eb1ng c\u00e1ch \u0111\u1eb7t \u1ea9n x = \u221ah \u2192 x2<\/sup> = h r\u00f9i chuy\u1ec3n v\u1ec1 ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 2 \u1ea9n x:\n<\/p>\n\n\n\n<\/p>\n\n\n\n
B\u00e0i 12 (trang 27 SGK V\u1eadt L\u00fd 10) :<\/strong> Th\u1ea3 m\u1ed9t\n h\u00f2n s\u1ecfi t\u1eeb tr\u00ean g\u00e1c cao xu\u1ed1ng \u0111\u1ea5t. Trong gi\u00e2y cu\u1ed1i c\u00f9ng h\u00f2n s\u1ecfi r\u01a1i \n\u0111\u01b0\u1ee3c qu\u00e3ng \u0111\u01b0\u1eddng 15 m. T\u00ednh \u0111\u1ed9 cao c\u1ee7a \u0111i\u1ec3m t\u1eeb \u0111\u00f3 b\u1eaft \u0111\u1ea7u th\u1ea3 h\u00f2n s\u1ecfi. \nL\u1ea5y g = 10 m\/s2<\/sup>.<\/p>\n\n\n\nL\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\nG\u1ecdi \u0111\u1ed9 cao ban \u0111\u1ea7u c\u1ee7a vi\u00ean s\u1ecfi l\u00e0 h (m) th\u1eddi gian r\u01a1i h\u1ebft \u0111\u1ed9 cao h l\u00e0 t.\n<\/p>\n\n\n\n
Ta c\u00f3: \n<\/p>\n\n\n\nQu\u00e3ng \u0111\u01b0\u1eddng v\u1eadt r\u01a1i \u0111\u01b0\u1ee3c tr\u01b0\u1edbc khi ch\u1ea1m \u0111\u1ea5t 1 gi\u00e2y (t\u1ee9c l\u00e0 r\u01a1i \u0111\u01b0\u1ee3c t\u2019 = t -1 s) l\u00e0: \n<\/p>\n\n\n\n<\/ins><\/p>\n\n\n\nTheo \u0111\u1ec1 ta c\u00f3: h \u2013 h\u2019 = 15 (3)\n<\/p>\n\n\n\n
Th\u1ebf (1), (2) v\u00e0o (3) \n<\/p>\n\n\n\nB\u00e0i 4: S\u1ef1 r\u01a1i t\u1ef1 do C1. ( trang 24 sgk V\u1eadt L\u00fd 10) L\u00e0m 4 th\u00ed nghi\u1ec7m sau: \u2217 Th\u00ed nghi\u1ec7m 1: Th\u1ea3 m\u1ed9t t\u1edd gi\u1ea5y v\u00e0 m\u1ed9t h\u00f2n s\u1ecfi. \u2217 Th\u00ed nghi\u1ec7m 2: Th\u1ea3 vi\u00ean gi\u1ea5y vo tr\u00f2n, n\u00e9n ch\u1eb7t v\u00e0 h\u00f2n s\u1ecfi. \u2217 Th\u00ed nghi\u1ec7m 3: Th\u1ea3 hai t\u1edd gi\u1ea5y c\u00f9ng k\u00edch […]<\/p>\n","protected":false},"author":12,"featured_media":44100,"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":"\n
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![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-9-trang-27-sgk-ly-10.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-9-trang-27-sgk-vat-ly-10.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-10-trang-27-sgk-vat-ly-10.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-11-trang-27-sgk-vat-ly-10-3.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-11-trang-27-sgk-vat-ly-10-4.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-11-trang-27-sgk-vat-ly-10-5.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-11-trang-27-sgk-vat-ly-10-6.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-12-trang-27-sgk-vat-ly-10-2.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-12-trang-27-sgk-vat-ly-10-3.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-12-trang-27-sgk-vat-ly-10-4.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-12-trang-27-sgk-vat-ly-10-5.PNG\")
<\/figure>\n","protected":false},"excerpt":{"rendered":"