M\u1eb9o \u0111\u00e1nh l\u1ee5i tr\u1eafc nghi\u1ec7m m\u00f4n l\u00fd chi\u00eau th\u1ee9 1.<\/strong><\/p>\n Khi trong 4 ph\u01b0\u01a1ng \u00e1n tr\u1ea3 l\u1eddi, c\u00f3 2 ph\u01b0\u01a1ng \u00e1n l\u00e0 ph\u1ee7 \u0111\u1ecbnh c\u1ee7a nhau, th\u00ec c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang ch\u1eafc ch\u1eafn ph\u1ea3i l\u00e0 m\u1ed9t trong hai ph\u01b0\u01a1ng \u00e1n n\u00e0y. M\u1eb9o \u0111\u00e1nh l\u1ee5i tr\u1eafc nghi\u1ec7m m\u00f4n l\u00fd chi\u00eau th\u1ee9 1. Khi trong 4 ph\u01b0\u01a1ng \u00e1n tr\u1ea3 l\u1eddi, c\u00f3 2 ph\u01b0\u01a1ng \u00e1n l\u00e0 ph\u1ee7 \u0111\u1ecbnh c\u1ee7a nhau, th\u00ec c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang ch\u1eafc ch\u1eafn ph\u1ea3i l\u00e0 m\u1ed9t trong hai ph\u01b0\u01a1ng \u00e1n n\u00e0y. V\u00ed d\u1ee5: Cho \u0111\u1ed3 th\u1ecb bi\u1ec3u di\u1ec5n m\u1ed9t qu\u00e1 tr\u00ecnh bi\u1ebfn \u0111\u1ed5i tr\u1ea1ng th\u00e1i […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[158],"tags":[],"yoast_head":"\n
\nV\u00ed d\u1ee5: Cho \u0111\u1ed3 th\u1ecb bi\u1ec3u di\u1ec5n m\u1ed9t qu\u00e1 tr\u00ecnh bi\u1ebfn \u0111\u1ed5i tr\u1ea1ng th\u00e1i c\u1ee7a ch\u1ea5t kh\u00ed (h\u00ecnh d\u01b0\u1edbi). Trong qu\u00e1 tr\u00ecnh di\u1ec5n bi\u1ebfn t\u1eeb tr\u1ea1ng th\u00e1i 1 \u0111\u1ebfn tr\u1ea1ng th\u00e1i 2
\nA. \u00e1p su\u1ea5t ch\u1ea5t kh\u00ed gi\u1ea3m;
\nB. th\u1ec3 t\u00edch ch\u1ea5t kh\u00ed t\u0103ng;
\nC. nhi\u1ec7t \u0111\u1ed9 ch\u1ea5t kh\u00ed thay \u0111\u1ed5i;
\nD. nhi\u1ec7t \u0111\u1ed9 ch\u1ea5t kh\u00ed kh\u00f4ng \u0111\u1ed5i.
\nCh\u1ecdn \u0111\u00e1p \u00e1n SAI. R\u00f5 r\u00e0ng v\u1edbi tr\u01b0\u1eddng h\u1ee3p c\u00e2u h\u1ecfi n\u00e0y, ta kh\u00f4ng c\u1ea7n quan t\u00e2m \u0111\u1ebfn hai ph\u01b0\u01a1ng \u00e1n A v\u00e0 B, v\u00ec C v\u00e0 D kh\u00f4ng th\u1ec3 c\u00f9ng \u0111\u00fang ho\u1eb7c c\u00f9ng sai \u0111\u01b0\u1ee3c. N\u1ebfu v\u00e0o thi m\u00e0 g\u1eb7p c\u00e2u h\u1ecfi nh\u01b0 th\u1ebf n\u00e0y th\u00ec coi nh\u01b0 b\u1ea1n may m\u1eafn, v\u00ec b\u1ea1n \u0111\u00e3 \u0111\u01b0\u1ee3c tr\u1ee3 gi\u00fap 50 \u2013 50 r\u1ed3i
\nM\u1eb9o \u0111\u00e1nh l\u1ee5i tr\u1eafc nghi\u1ec7m m\u00f4n l\u00fd chi\u00eau th\u1ee9 2.<\/strong>
\nKhi 4 \u0111\u00e1p s\u1ed1 n\u00eau ra c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng c\u1ea7n t\u00ecm c\u00f3 t\u1edbi 3, 4 \u0111\u01a1n v\u1ecb kh\u00e1c nhau th\u00ec h\u00e3y khoan t\u00ednh to\u00e1n \u0111\u00e3, c\u00f3 th\u1ec3 ng\u01b0\u1eddi ta mu\u1ed1n ki\u1ec3m tra ki\u1ebfn th\u1ee9c v\u1ec1 th\u1ee9 nguy\u00ean (\u0111\u01a1n v\u1ecb c\u1ee7a \u0111\u1ea1i l\u01b0\u1ee3ng v\u1eadt l\u00ed) \u0111\u1ea5y. V\u00ed d\u1ee5: M\u1ed9t \u0111\u1ed9ng c\u01a1 c\u00f3 th\u1ec3 k\u00e9o m\u1ed9t chi\u1ebfc t\u00e0u \u0111i xa 100m trong kho\u1ea3ng th\u1eddi gian 20 gi\u00e2y v\u1edbi l\u1ef1c ph\u00e1t \u0111\u1ed9ng trung b\u00ecnh 5000N. C\u00f4ng su\u1ea5t c\u1ee7a \u0111\u1ed9ng c\u01a1 n\u00e0y l\u00e0
\nA. 500 000 J;
\nB. 500 000 kg.m\/s;
\nC. 34 CV;
\nD. 34 N.s.
\nV\u1edbi b\u00e0i to\u00e1n n\u00e0y, sau m\u1ed9t lo\u1ea1t t\u00ednh to\u00e1n, b\u1ea1n s\u1ebd thu \u0111\u01b0\u1ee3c \u0111\u00e1p s\u1ed1 l\u00e0 34 CV. Tuy nhi\u00ean, ch\u1ec9 c\u1ea7n nhanh tr\u00ed m\u1ed9t ch\u00fat th\u00ec vi\u1ec7c ch\u1ecdn \u0111\u00e1p s\u1ed1 34 CV ph\u1ea3i l\u00e0 hi\u1ec3n nhi\u00ean, kh\u00f4ng c\u1ea7n l\u00e0m to\u00e1n.
\nM\u1eb9o \u0111\u00e1nh l\u1ee5i tr\u1eafc nghi\u1ec7m m\u00f4n l\u00fd chi\u00eau th\u1ee9 3.<\/strong>
\n\u0110\u1eebng v\u1ed9i v\u00e0ng \u201ct\u00f4 v\u00f2ng tr\u00f2n\u201d khi con s\u1ed1 b\u1ea1n t\u00ednh \u0111\u01b0\u1ee3c tr\u00f9ng kh\u1edbp v\u1edbi con s\u1ed1 c\u1ee7a m\u1ed9t ph\u01b0\u01a1ng \u00e1n tr\u1ea3 l\u1eddi n\u00e0o \u0111\u1ea5y. M\u1ed7i \u0111\u1ea1i l\u01b0\u1ee3ng v\u1eadt l\u00ed c\u00f2n c\u1ea7n c\u00f3 \u0111\u01a1n v\u1ecb \u0111o ph\u00f9 h\u1ee3p n\u1eefa. V\u00ed d\u1ee5: M\u1ed9t h\u00f2n \u0111\u00e1 n\u1eb7ng 5kg \u0111\u1eb7t tr\u00ean \u0111\u1ec9nh m\u1ed9t t\u00f2a nh\u00e0 cao 20m. L\u1ea5y m\u1ed1c th\u1ebf n\u0103ng b\u1eb1ng kh\u00f4ng t\u1ea1i m\u1eb7t \u0111\u1ea5t v\u00e0 g = 10m\/s2. Th\u1ebf n\u0103ng c\u1ee7a h\u00f2n \u0111\u00e1 n\u00e0y l\u00e0
\nA. 100 J;
\nB. 100 W;
\nC. 1000 W;
\nD. 1 kJ.
\nGi\u1ea3i b\u00e0i to\u00e1n n\u00e0y, b\u1ea1n thu \u0111\u01b0\u1ee3c con s\u1ed1 1000. Nh\u01b0ng \u0111\u00e1p \u00e1n \u0111\u00fang l\u1ea1i l\u00e0 1 c\u01a1. H\u00e3y c\u1ea9n th\u1eadn v\u1edbi nh\u1eefng b\u00e0i to\u00e1n d\u1ea1ng n\u00e0y.
\nM\u1eb9o \u0111\u00e1nh l\u1ee5i tr\u1eafc nghi\u1ec7m m\u00f4n l\u00fd chi\u00eau th\u1ee9 4.<\/strong>
\nPh\u1ea3i c\u00e2n nh\u1eafc c\u00e1c con s\u1ed1 thu \u0111\u01b0\u1ee3c t\u1eeb b\u00e0i to\u00e1n c\u00f3 ph\u00f9 h\u1ee3p v\u1edbi nh\u1eefng ki\u1ebfn th\u1ee9c \u0111\u00e3 bi\u1ebft kh\u00f4ng. Ch\u1eb3ng h\u1ea1n t\u00ecm b\u01b0\u1edbc s\u00f3ng c\u1ee7a \u00e1nh s\u00e1ng kh\u1ea3 ki\u1ebfn th\u00ec gi\u00e1 tr\u1ecb ph\u1ea3i trong kho\u1ea3ng 0,380 \u0111\u1ebfn 0,760 m. Hay t\u00ednh gi\u00e1 tr\u1ecb l\u1ef1c ma s\u00e1t tr\u01b0\u1ee3t th\u00ec h\u00e3y nh\u1edb l\u00e0 l\u1ef1c ma s\u00e1t tr\u01b0\u1ee3t lu\u00f4n v\u00e0o kho\u1ea3ng tr\u00ean d\u01b0\u1edbi ch\u1ee5c ph\u1ea7n tr\u0103m c\u1ee7a \u00e1p l\u1ef1c. Trong v\u00ed d\u1ee5 sau, hai con s\u1ed1 0,5 N v\u00e0 6,48 N r\u00f5 r\u00e0ng l\u00e0 kh\u00f4ng th\u1ec3 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c.
\nM\u1ed9t \u00f4 t\u00f4 c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 2 t\u1ea5n \u0111ang chuy\u1ec3n \u0111\u1ed9ng v\u1edbi v\u1eadn t\u1ed1c 36 km\/h th\u00ec t\u1eaft m\u00e1y, sau khi \u0111i \u0111\u01b0\u1ee3c \u0111o\u1ea1n \u0111\u01b0\u1eddng 200m th\u00ec d\u1eebng h\u1eb3n. L\u1ef1c ma s\u00e1t trung b\u00ecnh t\u00e1c d\u1ee5ng l\u00ean \u00f4 t\u00f4 trong qu\u00e1 tr\u00ecnh n\u00e0y c\u00f3 \u0111\u1ed9 l\u1edbn
\nA. 500 N;
\nB. 0,5 N;
\nC. 6,48 N;
\nD. 6480 N.
\nBao gi\u1edd c\u0169ng v\u1eady, trong 4 ph\u01b0\u01a1ng \u00e1n tr\u1ea3 l\u1eddi, v\u1edbi m\u1ed9t ch\u00fat tinh \u00fd v\u00e0 \u00f3c ph\u00e1n \u0111o\u00e1n nhanh, tr\u00ean c\u01a1 s\u1edf ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc, b\u1ea1n lu\u00f4n lu\u00f4n c\u00f3 th\u1ec3 lo\u1ea1i tr\u1eeb ngay 2 ph\u01b0\u01a1ng \u00e1n kh\u00f4ng h\u1ee3p l\u00ed.
\nM\u1eb9o \u0111\u00e1nh l\u1ee5i tr\u1eafc nghi\u1ec7m m\u00f4n l\u00fd chi\u00eau th\u1ee9 5.<\/strong>
\nLu\u00f4n lu\u00f4n c\u1ea9n th\u1eadn v\u1edbi nh\u1eefng t\u1eeb ph\u1ee7 \u0111\u1ecbnh trong c\u00e2u h\u1ecfi, c\u1ea3 trong ph\u1ea7n \u0111\u1ec1 d\u1eabn l\u1eabn trong c\u00e1c ph\u01b0\u01a1ng \u00e1n tr\u1ea3 l\u1eddi. Kh\u00f4ng ph\u1ea3i ng\u01b0\u1eddi ra \u0111\u1ec1 thi n\u00e0o c\u0169ng \u201cnh\u00e2n t\u1eeb\u201d m\u00e0 in \u0111\u1eadm, in nghi\u00eang, vi\u1ebft hoa c\u00e1c t\u1eeb ph\u1ee7 \u0111\u1ecbnh cho b\u1ea1n \u0111\u00e2u. H\u00e3y \u0111\u00e1nh d\u1ea5u c\u00e1c t\u1eeb ph\u1ee7 \u0111\u1ecbnh \u0111\u1ec3 nh\u1eafc nh\u1edf b\u1ea3n th\u00e2n kh\u00f4ng ph\u1ea1m sai l\u1ea7m.
\nV\u00ed d\u1ee5: H\u1ec7 s\u1ed1 \u0111\u00e0n h\u1ed3i (hay \u0111\u1ed9 c\u1ee9ng) c\u1ee7a m\u1ed9t v\u1eadt \u0111\u00e0n h\u1ed3i kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o
\nA. ti\u1ebft di\u1ec7n ngang c\u1ee7a v\u1eadt \u0111\u00e0n h\u1ed3i;
\nB. chi\u1ec1u d\u00e0i ban \u0111\u1ea7u c\u1ee7a v\u1eadt \u0111\u00e0n h\u1ed3i;
\nC. b\u1ea3n ch\u1ea5t c\u1ee7a v\u1eadt \u0111\u00e0n h\u1ed3i;
\nD. kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a v\u1eadt \u0111\u00e0n h\u1ed3i.
\nH\u00e3y nh\u1edb l\u00e0 m\u1ed7i k\u00ec thi c\u00f3 kh\u00f4ng \u00edt s\u0129 t\u1eed \u201ctr\u1eadn vong\u201d ch\u1ec9 v\u00ec nh\u1eefng ch\u1eef \u201ckh\u00f4ng\u201d ch\u1ebft ng\u01b0\u1eddi nh\u01b0 tr\u00ean \u0111\u00e2y
\nM\u1eb9o \u0111\u00e1nh l\u1ee5i tr\u1eafc nghi\u1ec7m m\u00f4n l\u00fd chi\u00eau th\u1ee9 6<\/strong>
\nT\u01b0\u01a1ng t\u1ef1, b\u1ea1n ph\u1ea3i c\u1ea3nh gi\u00e1c v\u1edbi nh\u1eefng c\u00e2u h\u1ecfi y\u00eau c\u1ea7u nh\u1eadn \u0111\u1ecbnh ph\u00e1t bi\u1ec3u l\u00e0 \u0111\u00fang hay sai. L\u00e0m \u01a1n \u0111\u1ecdc cho h\u1ebft c\u00e2u h\u1ecfi. Th\u1ef1c t\u1ebf c\u00f3 b\u1ea1n ch\u1eb3ng \u0111\u1ecdc h\u1ebft c\u00e2u \u0111\u00e3 v\u1ed9i tr\u1ea3 l\u1eddi r\u1ed3i.
\nV\u00ed d\u1ee5: Ch\u1ecdn c\u00e2u ph\u00e1t bi\u1ec3u \u0110\u00daNG.
\nA. Khi c\u00e1c ph\u00e2n t\u1eed \u1edf r\u1ea5t g\u1ea7n nhau, l\u1ef1c t\u01b0\u01a1ng t\u00e1c gi\u1eefa ch\u00fang l\u00e0 l\u1ef1c h\u00fat;
\nB. Kh\u00f4ng c\u00f3 nhi\u1ec7t \u0111\u1ed9 th\u1ea5p h\u01a1n 0 K;
\nC. Trong qu\u00e1 tr\u00ecnh \u0111\u1eb3ng \u00e1p, th\u1ec3 t\u00edch kh\u00ed t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi nhi\u1ec7t \u0111\u1ed9 tuy\u1ec7t \u0111\u1ed1i;
\nD. Trong h\u1ec7 t\u1ecda \u0111\u1ed9 (p, V), \u0111\u01b0\u1eddng \u0111\u1eb3ng nhi\u1ec7t l\u00e0 m\u1ed9t parabol.
\nCho nh\u01b0 c\u00e2u n\u00e0y l\u00e0 nh\u00e2n \u0111\u1ea1o l\u1eafm ! S\u0129 t\u1eed c\u00f3 th\u1ec3 ch\u1ebft \u201cb\u1ea5t \u0111\u1eafc k\u00ec t\u1eed\u201d v\u00ec nh\u1eefng c\u00e2u \u201cth\u00f2ng\u201d ph\u00eda sau nh\u01b0 c\u00e2u sau \u0111\u00e2y, m\u00e0 kh\u00f4ng hi\u1ec3u sao, c\u00f3 nhi\u1ec1u b\u1ea1n kh\u00f4ng th\u00e8m \u0111\u1ecdc \u0111\u1ebfn khi l\u00e0m b\u00e0i ! Khi v\u1eadn t\u1ed1c c\u1ee7a m\u1ed9t v\u1eadt bi\u1ebfn thi\u00ean th\u00ec
\nA. \u0111\u1ed9ng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt bi\u1ebfn thi\u00ean;
\nB. th\u1ebf n\u0103ng c\u1ee7a v\u1eadt bi\u1ebfn thi\u00ean;
\nC. \u0111\u1ed9ng n\u0103ng c\u1ee7a v\u1eadt bi\u1ebfn thi\u00ean;
\nD. c\u01a1 n\u0103ng c\u1ee7a v\u1eadt bi\u1ebfn thi\u00ean.
\nCh\u1ecdn \u0111\u00e1p \u00e1n SAI.
\nM\u1eb9o \u0111\u00e1nh l\u1ee5i tr\u1eafc nghi\u1ec7m m\u00f4n l\u00fd chi\u00eau th\u1ee9 7<\/strong>
\n\u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a b\u00e0i ki\u1ec3m tra tr\u1eafc nghi\u1ec7m l\u00e0 ph\u1ea1m vi bao qu\u00e1t ki\u1ebfn th\u1ee9c r\u1ed9ng, c\u00f3 khi ch\u1ec9 nh\u1eefng \u201cch\u00fa \u00fd\u201d, \u201cl\u01b0u \u00fd\u201d, \u201cnh\u1eadn x\u00e9t\u201d nh\u1ecf l\u1ea1i gi\u00fap \u00edch cho b\u1ea1n r\u1ea5t nhi\u1ec1u khi l\u1ef1a ch\u1ecdn ph\u01b0\u01a1ng \u00e1n tr\u1ea3 l\u1eddi. N\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c v\u00e0 t\u1ef1 tin v\u1edbi ki\u1ebfn th\u1ee9c m\u00e0 m\u00ecnh c\u00f3, kh\u00f4ng \u0111\u1ec3 b\u1ecb nhi\u1ec5u v\u00ec nh\u1eefng d\u1eef ki\u1ec7n cho kh\u00f4ng c\u1ea7n thi\u1ebft. X\u00e9t v\u00ed d\u1ee5 sau: N\u00e9m m\u1ed9t v\u1eadt l\u00ean cao v\u1edbi v\u1eadn t\u1ed1c ban \u0111\u1ea7u 5 m\/s. Bi\u1ebft l\u1ef1c c\u1ea3n c\u1ee7a kh\u00f4ng kh\u00ed t\u1ec9 l\u1ec7 v\u1edbi b\u00ecnh ph\u01b0\u01a1ng v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt. V\u1eadn t\u1ed1c c\u1ee7a v\u1eadt khi r\u01a1i xu\u1ed1ng ch\u1ea1m \u0111\u1ea5t c\u00f3 gi\u00e1 tr\u1ecb
\nA. v\u1eabn l\u00e0 5 m\/s;
\nB. l\u1edbn h\u01a1n 5 m\/s;
\nC. nh\u1ecf h\u01a1n 5 m\/s;
\nD. kh\u00f4ng th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c.
\nTrong b\u00e0i to\u00e1n n\u00e0y, chi ti\u1ebft \u201ct\u1ec9 l\u1ec7 v\u1edbi b\u00ecnh ph\u01b0\u01a1ng v\u1eadn t\u1ed1c\u201d \u0111\u01b0a ra ch\u1ec9 v\u1edbi m\u1ed9t m\u1ee5c \u0111\u00edch l\u00e0 l\u00e0m cho b\u1ea1n b\u1ed1i r\u1ed1i. M\u1ea5u ch\u1ed1t v\u1ea5n \u0111\u1ec1 l\u00e0 \u1edf ch\u1ed7 c\u00f3 s\u1ef1 xu\u1ea5t hi\u1ec7n c\u1ee7a l\u1ef1c c\u1ea3n trong b\u00e0i to\u00e1n. \u0110\u01a1n gi\u1ea3n th\u1ebf th\u00f4i. H\u00e3y v\u1ee9t \u0111i chi ti\u1ebft \u201ct\u1ec9 l\u1ec7 v\u1edbi b\u00ecnh ph\u01b0\u01a1ng v\u1eadn t\u1ed1c\u201d, l\u00e0 d\u1eef ki\u1ec7n kh\u00f4ng c\u1ea7n thi\u1ebft (d\u1eef ki\u1ec7n g\u00e2y nhi\u1ec5u), b\u00e0i to\u00e1n h\u1eb3n l\u00e0 \u0111\u01a1n gi\u1ea3n \u0111i r\u1ea5t nhi\u1ec1u.<\/p>\n","protected":false},"excerpt":{"rendered":"