<\/ins><\/p>\n\n\n\nThanh th\u00e9p co l\u1ea1i, chi\u1ec1u d\u00e0i gi\u1ea3m \u0111i \u0111\u1ed3ng th\u1eddi ti\u1ebft di\u1ec7n c\u1ee7a thanh \u1edf \u0111o\u1ea1n gi\u1eefa t\u0103ng l\u00ean, thanh th\u00e9p b\u1ecb ph\u00ecnh ra.<\/p>\n\n\n\n
C2.<\/strong> ( trang 189 sgk V\u1eadt L\u00fd 10): D\u00f9ng k\u00ecm k\u00e9o d\u00e3n m\u1ed9t l\u00f2 xo nh\u1ecf(l\u1ea5y trong ru\u1ed9t b\u00fat ch\u00ec), r\u1ed3i bu\u00f4ng ra:<\/p>\n\n\n\n–\tL\u1ea7n \u0111\u1ea7u k\u00e9o nh\u1eb9 \u0111\u1ec3 l\u00f2 xo d\u00e3n \u00edt;<\/p>\n\n\n\n
–\tL\u1ea7n sau k\u00e9o m\u1ea1nh \u0111\u1ec3 l\u00f2 xo d\u00e3n d\u00e0i g\u1ea5p kho\u1ea3ng 2-3 l\u1ea7n \u0111\u1ed9 d\u00e0i ban \u0111\u1ea7u.<\/p>\n\n\n\n
Quan s\u00e1t xem tr\u01b0\u1eddng h\u1ee3p n\u00e0o l\u00f2 xo bi\u1ebfn d\u1ea1ng \u0111\u00e0n h\u1ed3i?<\/ins><\/p>\n\n\n\nTr\u1ea3 l\u1eddi:<\/strong><\/p>\n\n\n\nL\u1ea7n \u0111\u1ea7u k\u00e9o nh\u1eb9, l\u00f2 xo d\u00e3n \u00edt r\u1ed3i th\u1ea3 th\u00ec l\u00f2 xo bi\u1ebfn d\u1ea1ng \u0111\u00e0n h\u1ed3i.<\/p>\n\n\n\n
L\u1ea7n sau k\u00e9o m\u1ea1nh, l\u00f2 xo d\u00e3n nhi\u1ec1u, th\u1ea3 th\u00ec l\u00f2 xo kh\u00f4ng c\u00f2n \u0111\u00e0n h\u1ed3i.<\/p>\n\n\n\n
C3.<\/strong> ( trang 189 sgk V\u1eadt L\u00fd 10): M\u1ed9t thanh th\u00e9p ch\u1ecbu t\u00e1c d\u1ee5ng m\u1ed9t l\u1ef1c F\u2192 v\u00e0 b\u1ecb bi\u1ebfn d\u1ea1ng. N\u1ebfu ti\u1ebft di\u1ec7n ngang S c\u1ee7a thanh c\u00e0ng l\u1edbn th\u00ec m\u1ee9c \u0111\u1ed9 bi\u1ebfn d\u1ea1ng c\u1ee7a thanh c\u00e0ng l\u1edbn hay c\u00e0ng nh\u1ecf?<\/p>\n\n\n\nTr\u1ea3 l\u1eddi:<\/strong><\/p>\n\n\n\nV\u1edbi l\u1ef1c t\u00e1c d\u1ee5ng F\u2192 kh\u00f4ng \u0111\u1ed5i, \u0111\u1ed9 bi\u1ebfn d\u1ea1ng c\u1ee7a thanh th\u00e9p c\u00e0ng nh\u1ecf khi ti\u1ebft di\u1ec7n c\u1ee7a n\u00f3 c\u00e0ng l\u1edbn v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n\n\n\n
C4.<\/strong> ( trang 190 sgk V\u1eadt L\u00fd 10): Theo \u0111\u1ecbnh lu\u1eadt III Niu-t\u01a1n, l\u1ef1c F\u2192\u0111h<\/sub> trong v\u1eadt r\u1eafn ph\u1ea3i c\u00f3 ph\u01b0\u01a1ng, chi\u1ec1u v\u00e0 \u0111\u1ed9 l\u1edbn nh\u01b0 th\u1ebf n\u00e0o so v\u1edbi l\u1ef1c F\u2192 g\u00e2y ra bi\u1ebfn d\u1ea1ng c\u1ee7a v\u1eadt?<\/p>\n\n\n\nTr\u1ea3 l\u1eddi:<\/strong><\/p>\n\n\n\nL\u1ef1c \u0111\u00e0n h\u1ed3i trong v\u1eadt r\u1eafn ph\u1ea3i c\u00f9ng ph\u01b0\u01a1ng, c\u00f9ng \u0111\u1ed9 l\u1edbn v\u1edbi ngo\u1ea1i l\u1ef1c nh\u01b0ng ng\u01b0\u1ee3c chi\u1ec1u.<\/p>\n\n\n\n
B\u00e0i 6 (trang 192 SGK V\u1eadt L\u00fd 10) :<\/strong> \u0110\u1ed9 c\u1ee9ng (hay h\u1ec7 s\u1ed1 \u0111\u00e0n h\u1ed3i) c\u1ee7a v\u1eadt r\u1eafn (h\u00ecnh tr\u1ee5 \u0111\u1ed3ng ch\u1ea5t) ph\u1ee5 thu\u1ed9c nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0o d\u01b0\u1edbi \u0111\u00e2y?<\/ins><\/p>\n\n\n\nA. Ch\u1ea5t li\u1ec7u c\u1ee7a v\u1eadt r\u1eafn<\/p>\n\n\n\n
B. Ti\u1ebft di\u1ec7n c\u1ee7a v\u1eadt r\u1eafn<\/p>\n\n\n\n
C. \u0110\u1ed9 d\u00e0i ban \u0111\u1ea7u c\u1ee7a v\u1eadt r\u1eafn<\/p>\n\n\n\n
D. C\u1ea3 ba y\u1ebfu t\u1ed1 tr\u00ean.<\/p>\n\n\n\n
L\u1eddi gi\u1ea3i:<\/strong><\/p>\n\n\n\nCh\u1ecdn D.<\/p>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-6-trang-192-sgk-vat-ly-10.PNG\")
<\/figure>\n\n\n\n l\u00e0 h\u1ec7 s\u1ed1 \u0111\u00e0n h\u1ed3i hay \u0111\u1ed9 c\u1ee9ng c\u1ee7a thanh r\u1eafn .<\/p>\n\n\n\n
Trong \u0111\u00f3: <\/p>\n\n\n\n
E l\u00e0 su\u1ea5t \u0111\u00e0n h\u1ed3i, \u0111\u01a1n v\u1ecb l\u00e0 Pa;<\/p>\n\n\n\n
S l\u00e0 di\u1ec7n t\u00edch ti\u1ebft di\u1ec7n c\u1ee7a v\u1eadt r\u1eafn \u0111\u1ed3ng ch\u1ea5t, h\u00ecnh tr\u1ee5.<\/p>\n\n\n\n
lo<\/sub> l\u00e0 chi\u1ec1u d\u00e0i ban \u0111\u1ea7u c\u1ee7a v\u1eadt<\/p>\n\n\n\nB\u00e0i 7 (trang 192 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u1ed9t s\u1ee3i\n d\u00e2y th\u00e9p \u0111\u01b0\u1eddng k\u00ednh 1,5 mm c\u00f3 \u0111\u1ed9 d\u00e0i ban \u0111\u1ea7u l\u00e0 5,2 m. T\u00ednh h\u1ec7 s\u1ed1 \u0111\u00e0n \nh\u1ed3i c\u1ee7a s\u1ee3i d\u00e2y th\u00e9p, bi\u1ebft su\u1ea5t \u0111\u00e0n h\u1ed3i c\u1ee7a th\u00e9p l\u00e0 E = 2.1011<\/sup> Pa.<\/p>\n\n\n\nL\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\nd = 1,5mm = 1,5.10-3<\/sup>m; l0 = 5,2m; E = 2.1011<\/sup> Pa; H\u1ec7 s\u1ed1 \u0111\u00e0n h\u1ed3i k = ?<\/p>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-7-trang-192-sgk-ly-10-1.PNG\")
<\/figure>\n\n\n\nB\u00e0i 8 (trang 192 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u1ed9t \nthanh r\u1eafn \u0111\u1ed3ng ch\u1ea5t ti\u1ebft di\u1ec7n \u0111\u1ec1u c\u00f3 h\u1ec7 s\u1ed1 \u0111\u00e0n h\u1ed3i l\u00e0 100 N\/m, \u0111\u1ea7u tr\u00ean \ng\u1eafn c\u1ed1 \u0111\u1ecbnh v\u00e0 \u0111\u1ea7u d\u01b0\u1edbi treo m\u1ed9t v\u1eadt n\u1eb7ng \u0111\u1ec3 thanh b\u1ecb bi\u1ebfn d\u1ea1ng \u0111\u00e0n h\u1ed3i.\n Bi\u1ebft gia t\u1ed1c r\u01a1i t\u1ef1 do g = 10 m\/s2<\/sup>. Mu\u1ed1n thanh r\u1eafn d\u00e0i th\u00eam 1 cm, v\u1eadt n\u1eb7ng ph\u1ea3i c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng l\u00e0 bao nhi\u00eau?<\/p>\n\n\n\nL\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\n k = 100 N\/m<\/p>\n\n\n\n
\u0394l = 1 cm = 0,01m<\/p>\n\n\n\n
g = 10 m\/s2<\/sup><\/p>\n\n\n\n m = ?<\/p>\n\n\n\n
Khi thanh r\u1eafn c\u00e2n b\u1eb1ng \u1edf tr\u1ea1ng th\u00e1i bi\u1ebfn d\u1ea1ng, ta c\u00f3: <\/p>\n\n\n\n
F\u0111h<\/sub> = mg \u21d4 k|\u0394l| = mg<\/p>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-8-trang-192-sgk-ly-10-1.PNG\")
<\/figure>\n\n\n\nB\u00e0i 9 (trang 192 SGK V\u1eadt L\u00fd 10) :<\/strong> M\u1ed9t thanh th\u00e9p tr\u00f2n \u0111\u01b0\u1eddng k\u00ednh 20 mm c\u00f3 su\u1ea5t \u0111\u00e0n h\u1ed3i E = 2.1011<\/sup> Pa. Gi\u1eef ch\u1eb7t m\u1ed9t \u0111\u1ea7u thanh v\u00e0 n\u00e9n \u0111\u1ea7u c\u00f2n l\u1ea1i b\u1eb1ng m\u1ed9t l\u1ef1c F = 1,57.105<\/sup> N \u0111\u1ec3 thanh n\u00e0y bi\u1ebfn d\u1ea1ng \u0111\u00e0n h\u1ed3i. T\u00ednh \u0111\u1ed9 bi\u1ebfn d\u1ea1ng t\u1ec9 \u0111\u1ed1i c\u1ee7a thanh. <\/p>\n\n\n\nL\u1eddi gi\u1ea3i:<\/strong><\/ins><\/p>\n\n\n\n d = 20 mm = 20.10-3<\/sup>m<\/p>\n\n\n\n E = 2.1011<\/sup> Pa<\/p>\n\n\n\n Fn\u00e9n<\/sub> = 1,57.105<\/sup> N<\/p>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-9-trang-192-sgk-ly-10-1.PNG\")
<\/figure>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-9-trang-192-sgk-ly-10-2.PNG\")
<\/figure>\n\n\n\nTa c\u00f3: \n<\/p>\n\n\n\n
\u2192 \u0110\u1ed9 bi\u1ebfn d\u1ea1ng t\u1ec9 \u0111\u1ed1i c\u1ee7a thanh:<\/p>\n\n\n\n![\"Gi\u1ea3i](\"https:\/\/vietjack.com\/giai-bai-tap-vat-ly-10\/images\/bai-9-trang-192-sgk-ly-10-3.PNG\")
<\/figure>\n\n\n\n<\/ins><\/p>\n","protected":false},"excerpt":{"rendered":"C1. ( trang 188 sgk V\u1eadt L\u00fd 10): N\u1ebfu gi\u1eef ch\u1eb7t \u0111\u1ea7u A c\u1ee7a thanh th\u00e9p AB v\u00e0 t\u00e1c d\u1ee5ng v\u00e0o \u0111\u1ea7u B m\u1ed9t l\u1ef1c n\u00e9n \u0111\u1ee7 l\u1edbn \u0111\u1ec3 g\u00e2y ra bi\u1ebfn d\u1ea1ng th\u00ec \u0111\u1ed9 d\u00e0i l v\u00e0 ti\u1ebft di\u1ec7n ngang S c\u1ee7a thanh n\u00e0y thay \u0111\u1ed5i nh\u01b0 th\u1ebf n\u00e0o? Tr\u1ea3 l\u1eddi: Thanh th\u00e9p co […]<\/p>\n","protected":false},"author":12,"featured_media":44194,"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
Gi\u1ea3i V\u1eadt L\u00ed 10 B\u00e0i 35 : Bi\u1ebfn d\u1ea1ng c\u01a1 c\u1ee7a v\u1eadt r\u1eafn<\/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-35-bien-dang-co-cua-vat-ran\/\" \/>\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 35 : Bi\u1ebfn d\u1ea1ng c\u01a1 c\u1ee7a v\u1eadt r\u1eafn\" \/>\n<meta property=\"og:description\" content=\"C1. 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( trang 188 sgk V\u1eadt L\u00fd 10): N\u1ebfu gi\u1eef ch\u1eb7t \u0111\u1ea7u A c\u1ee7a thanh th\u00e9p AB v\u00e0 t\u00e1c d\u1ee5ng v\u00e0o \u0111\u1ea7u B m\u1ed9t l\u1ef1c n\u00e9n \u0111\u1ee7 l\u1edbn \u0111\u1ec3 g\u00e2y ra bi\u1ebfn d\u1ea1ng th\u00ec \u0111\u1ed9 d\u00e0i l v\u00e0 ti\u1ebft di\u1ec7n ngang S c\u1ee7a thanh n\u00e0y thay \u0111\u1ed5i nh\u01b0 th\u1ebf n\u00e0o? 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