{"segment":[{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":10,"ques":"Gi\u1edbi h\u1ea1n \u0111o (GH\u0110) c\u1ee7a th\u01b0\u1edbc l\u00e0:","select":["A. \u0111\u1ed9 d\u00e0i l\u1edbn nh\u1ea5t ghi tr\u00ean th\u01b0\u1edbc.","B. \u0111\u1ed9 d\u00e0i nh\u1ecf nh\u1ea5t ghi tr\u00ean th\u01b0\u1edbc.","C. \u0111\u1ed9 d\u00e0i gi\u1eefa 2 v\u1ea1ch chia li\u00ean ti\u1ebfp tr\u00ean th\u01b0\u1edbc.","D. \u0111\u1ed9 d\u00e0i gi\u1eefa 2 v\u1ea1ch chia nh\u1ecf nh\u1ea5t tr\u00ean th\u01b0\u1edbc."],"hint":"","explain":"<span class='basic_left'>Gi\u1edbi h\u1ea1n \u0111o (GH\u0110) c\u1ee7a th\u01b0\u1edbc l\u00e0 \u0111\u1ed9 d\u00e0i l\u1edbn nh\u1ea5t ghi tr\u00ean th\u01b0\u1edbc.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2431},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":10,"ques":"C\u00e2u n\u00e0o sau \u0111\u00e2y \u0111\u00fang khi n\u00f3i v\u1ec1 quy t\u1eafc \u0111\u1eb7t m\u1eaft \u0111\u1ecdc k\u1ebft qu\u1ea3 \u0111o.","select":["A. \u0110\u1eb7t m\u1eaft nh\u00ecn theo h\u01b0\u1edbng xi\u00ean sang ph\u1ea3i","B. \u0110\u1eb7t m\u1eaft nh\u00ecn theo h\u01b0\u1edbng sang tr\u00e1i.","C. \u0110\u1eb7t m\u1eaft nh\u00ecn theo h\u01b0\u1edbng vu\u00f4ng g\u00f3c v\u1edbi c\u1ea1nh c\u1ee7a th\u01b0\u1edbc t\u1ea1i \u0111\u1ea7u kia c\u1ee7a m\u1ed9t v\u1eadt.","D. \u0110\u1eb7t m\u1eaft nh\u01b0 th\u1ebf n\u00e0o l\u00e0 t\u00f9y \u00fd."],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2432},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":10,"ques":"C\u00e2u n\u00e0o sau \u0111\u00e2y \u0111\u00fang khi n\u00f3i v\u1ec1 quy t\u1eafc \u0111\u1eb7t b\u00ecnh chia \u0111\u1ed9:","select":["A. \u0110\u1eb7t b\u00ecnh sao cho m\u1ef1c ch\u1ea5t l\u1ecfng nghi\u00eang v\u1ec1 ph\u00eda c\u1ea1nh tr\u00ean b\u00ecnh \u0111\u1ec3 d\u1ec5 \u0111\u1ecdc k\u1ebft qu\u1ea3","B. \u0110\u1eb7t b\u00ecnh sao cho m\u1ef1c ch\u1ea5t l\u1ecfng nghi\u00eang v\u1ec1 c\u00e1c s\u1ed1 \u0111\u01b0\u1ee3c in tr\u00ean b\u00ecnh","C. \u0110\u1eb7t b\u00ecnh chia \u0111\u1ed9 th\u1eb3ng \u0111\u1ee9ng so v\u1edbi ph\u01b0\u01a1ng n\u1eb1m ngang.","D. \u0110\u1eb7t b\u00ecnh nh\u01b0 th\u1ebf n\u00e0o c\u0169ng \u0111\u01b0\u1ee3c, mi\u1ec5n sao m\u1ef1c ch\u1ea5t l\u1ecfng trong b\u00ecnh \u1ed5n \u0111\u1ecbnh"],"hint":"","explain":"<span class='basic_left'>quy t\u1eafc \u0111\u1eb7t b\u00ecnh chia \u0111\u1ed9 l\u00e0 \u0111\u1eb7t th\u1eb3ng \u0111\u1ee9ng so v\u1edbi ph\u01b0\u01a1ng n\u1eb1m ngang<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2433},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":10,"ques":"Khi s\u1eed d\u1ee5ng b\u00ecnh tr\u00e0n v\u00e0 b\u00ecnh ch\u1ee9a \u0111\u1ec3 \u0111o th\u1ec3 t\u00edch v\u1eadt r\u1eafn kh\u00f4ng th\u1ea5m n\u01b0\u1edbc th\u00ec ng\u01b0\u1eddi ta x\u00e1c \u0111\u1ecbnh th\u1ec3 t\u00edch c\u1ee7a v\u1eadt b\u1eb1ng c\u00e1ch :","select":["A. \u0110o th\u1ec3 t\u00edch b\u00ecnh tr\u00e0n","B. \u0110o th\u1ec3 t\u00edch b\u00ecnh ch\u1ee9a","C. \u0110o th\u1ec3 t\u00edch ph\u1ea7n n\u01b0\u1edbc tr\u00e0n ra t\u1eeb b\u00ecnh tr\u00e0n sang b\u00ecnh ch\u1ee9a","D. \u0110o th\u1ec3 t\u00edch n\u01b0\u1edbc c\u00f2n l\u1ea1i trong b\u00ecnh"],"hint":"","explain":"<span class='basic_left'>T\u00ednh th\u1ec3 t\u00edch c\u1ee7a v\u1eadt b\u1eb1ng c\u00e1ch \u0111o th\u1ec3 t\u00edch ph\u1ea7n n\u01b0\u1edbc tr\u00e0n ra t\u1eeb b\u00ecnh tr\u00e0n sang b\u00ecnh ch\u1ee9a.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2434},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":10,"ques":"Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang. Hai l\u1ef1c c\u00e2n b\u1eb1ng:","select":["A. L\u00e0 hai l\u1ef1c m\u1ea1nh nh\u01b0 nhau, c\u00f3 c\u00f9ng ph\u01b0\u01a1ng v\u00e0 c\u00f9ng chi\u1ec1u, t\u00e1c d\u1ee5ng v\u00e0o c\u00f9ng m\u1ed9t v\u1eadt. ","B. L\u00e0 hai l\u1ef1c m\u1ea1nh nh\u01b0 nhau, c\u00f3 c\u00f9ng ph\u01b0\u01a1ng nh\u01b0ng ng\u01b0\u1ee3c chi\u1ec1u, t\u00e1c d\u1ee5ng v\u00e0o c\u00f9ng m\u1ed9t v\u1eadt.","C. L\u00e0 hai l\u1ef1c m\u1ea1nh nh\u01b0 nhau, ng\u01b0\u1ee3c ph\u01b0\u01a1ng v\u00e0 ng\u01b0\u1ee3c chi\u1ec1u, t\u00e1c d\u1ee5ng v\u00e0o c\u00f9ng m\u1ed9t v\u1eadt. ","D. L\u00e0 hai l\u1ef1c m\u1ea1nh nh\u01b0 nhau, c\u00f3 c\u00f9ng ph\u01b0\u01a1ng nh\u01b0ng ng\u01b0\u1ee3c chi\u1ec1u, t\u00e1c d\u1ee5ng v\u00e0o 2 v\u1eadt ng\u01b0\u1ee3c chi\u1ec1u nhau."],"hint":"","explain":"<span class='basic_left'>Hai l\u1ef1c c\u00e2n b\u1eb1ng l\u00e0 hai l\u1ef1c m\u1ea1nh nh\u01b0 nhau, c\u00f3 c\u00f9ng ph\u01b0\u01a1ng nh\u01b0ng ng\u01b0\u1ee3c chi\u1ec1u, t\u00e1c d\u1ee5ng v\u00e0o c\u00f9ng m\u1ed9t v\u1eadt.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2435},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":10,"ques":"Khi m\u1ed9t qu\u1ea3 b\u00f3ng \u0111\u1eadp v\u00e0o m\u1ed9t b\u1ee9c t\u01b0\u1eddng th\u00ec l\u1ef1c m\u00e0 b\u1ee9c t\u01b0\u1eddng t\u00e1c d\u1ee5ng l\u00ean qu\u1ea3 b\u00f3ng s\u1ebd g\u00e2y ra nh\u1eefng k\u1ebft qu\u1ea3 g\u00ec?","select":["A. Ch\u1ec9 l\u00e0m bi\u1ebfn \u0111\u1ed5i chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a qu\u1ea3 b\u00f3ng ","B. Ch\u1ec9 l\u00e0m bi\u1ebfn d\u1ea1ng qu\u1ea3 b\u00f3ng","C. Kh\u00f4ng l\u00e0m bi\u1ebfn d\u1ea1ng v\u00e0 c\u0169ng kh\u00f4ng l\u00e0m bi\u1ebfn \u0111\u1ed5i chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a qu\u1ea3 b\u00f3ng","D. V\u1eeba l\u00e0m bi\u1ebfn d\u1ea1ng qu\u1ea3 b\u00f3ng, v\u1eeba l\u00e0m bi\u1ebfn \u0111\u1ed5i chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a n\u00f3"],"hint":"","explain":"<span class='basic_left'>Khi m\u1ed9t qu\u1ea3 b\u00f3ng \u0111\u1eadp v\u00e0o m\u1ed9t b\u1ee9c t\u01b0\u1eddng th\u00ec l\u1ef1c m\u00e0 b\u1ee9c t\u01b0\u1eddng t\u00e1c d\u1ee5ng l\u00ean qu\u1ea3 b\u00f3ng s\u1ebd v\u1eeba l\u00e0m bi\u1ebfn d\u1ea1ng qu\u1ea3 b\u00f3ng, v\u1eeba l\u00e0m bi\u1ebfn \u0111\u1ed5i chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a n\u00f3.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2436},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":10,"ques":"M\u1ed9t ng\u01b0\u1eddi \u0111\u1ee9ng y\u00ean tr\u00ean m\u1ed9t t\u1ea5m v\u00e1n m\u1ecfng. T\u1ea5m v\u00e1n b\u1ecb cong \u0111i. N\u00f3 \u0111\u00e3 b\u1ecb bi\u1ebfn d\u1ea1ng. \u0110\u00f3 l\u00e0 do k\u1ebft qu\u1ea3 t\u00e1c d\u1ee5ng c\u1ee7a \u2026\u2026\u2026 c\u1ee7a ng\u01b0\u1eddi. ","select":["A. Tr\u1ecdng l\u1ef1c","B. L\u1ef1c \u0111\u00e0n h\u1ed3i","C. Tr\u1ecdng l\u01b0\u1ee3ng","D. L\u1ef1c n\u00e9n"],"hint":"","explain":"<span class='basic_left'>\u0110\u00f3 l\u00e0 do k\u1ebft qu\u1ea3 t\u00e1c d\u1ee5ng c\u1ee7a tr\u1ecdng l\u1ef1c c\u1ee7a ng\u01b0\u1eddi.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2437},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":10,"ques":"Khi treo m\u1ed9t c\u00e1i chai \u0111\u1ef1ng 2 l\u00edt n\u01b0\u1edbc v\u00e0o m\u1ed9t l\u1ef1c k\u1ebf khi \u0111\u00f3 kim c\u1ee7a l\u1ef1c k\u1ebf ch\u1ec9 25N, bi\u1ebft kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 1000kg\/${{m}^{3}}$. Khi treo chai kh\u00f4ng \u0111\u1ef1ng n\u01b0\u1edbc v\u00e0o l\u1ef1c k\u1ebf khi \u0111\u00f3 kim tr\u00ean l\u1ef1c k\u1ebf ch\u1ec9 l\u00e0:","select":["A. 5N","B. 50N","C. 0,5N","D. 500N"],"hint":"","explain":"<span class='basic_left'>Kh\u1ed1i l\u01b0\u1ee3ng n\u01b0\u1edbc l\u00e0 : 2kg, n\u00ean tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a n\u01b0\u1edbc l\u00e0 20N.<br\/>v\u1eady khi treo chai kh\u00f4ng \u0111\u1ef1ng n\u01b0\u1edbc v\u00e0o l\u1ef1c k\u1ebf khi \u0111\u00f3 kim tr\u00ean l\u1ef1c k\u1ebf ch\u1ec9 l\u00e0: 25-20 = 5N.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2438},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":10,"ques":"M\u1ed9t ng\u01b0\u1eddi th\u1ee3 x\u00e2y mu\u1ed1n d\u00f9ng l\u1ef1c kho\u1ea3ng 250N \u0111\u1ec3 k\u00e9o m\u1ed9t bao xi-m\u0103ng 50kg l\u00ean t\u1ea7ng th\u1ee9 10 c\u1ee7a t\u00f2a nh\u00e0 \u0111ang x\u00e2y; m\u1ed9t h\u1ecdc sinh mu\u1ed1n d\u00f9ng l\u1ef1c l\u1edbn h\u01a1n 100N \u0111\u1ec3 k\u00e9o m\u1ed9t g\u00e0u n\u01b0\u1edbc 10kg t\u1eeb d\u01b0\u1edbi gi\u1ebfng l\u00ean, mu\u1ed1n v\u1eady: ","select":["A. ng\u01b0\u1eddi th\u1ee3 x\u00e2y ph\u1ea3i d\u00f9ng r\u00f2ng r\u1ecdc, ng\u01b0\u1eddi h\u1ecdc sinh c\u0169ng ph\u1ea3i d\u00f9ng r\u00f2ng r\u1ecdc","B. ng\u01b0\u1eddi th\u1ee3 x\u00e2y ph\u1ea3i d\u00f9ng r\u00f2ng r\u1ecdc, ng\u01b0\u1eddi h\u1ecdc sinh ph\u1ea3i d\u00f9ng m\u1eb7t ph\u1eb3ng nghi\u00eang","C. ng\u01b0\u1eddi th\u1ee3 x\u00e2y ph\u1ea3i d\u00f9ng m\u1eb7t ph\u1eb3ng nghi\u00eang, ng\u01b0\u1eddi h\u1ecdc sinh c\u0169ng ph\u1ea3i d\u00f9ng m\u1eb7t ph\u1eb3ng nghi\u00eang","D. ng\u01b0\u1eddi th\u1ee3 x\u00e2y ph\u1ea3i d\u00f9ng r\u00f2ng r\u1ecdc, ng\u01b0\u1eddi h\u1ecdc sinh kh\u00f4ng ph\u1ea3i d\u00f9ng r\u00f2ng r\u1ecdc"],"hint":"","explain":"<span class='basic_left'>Ng\u01b0\u1eddi th\u1ee3 x\u00e2y k\u00e9o bao xi-m\u0103ng b\u1eb1ng 1 l\u1ef1c \u00edt h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a n\u00f3 n\u00ean ph\u1ea3i d\u00f9ng r\u00f2ng r\u1ecdc.Ng\u01b0\u1eddi h\u1ecdc sinh k\u00e9o g\u00e0u n\u01b0\u1edbc b\u1eb1ng 1 l\u1ef1c l\u1edbn h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a n\u00f3 n\u00ean kh\u00f4ng ph\u1ea3i d\u00f9ng r\u00f2ng r\u1ecdc.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2439},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":10,"ques":"Ng\u01b0\u1eddi ta d\u00f9ng 1 pal\u0103ng g\u1ed3m 1 r\u00f2ng r\u1ecdc c\u1ed1 \u0111\u1ecbnh v\u00e0 3 r\u00f2ng r\u1ecdc \u0111\u1ed9ng \u0111\u1ec3 \u0111\u01b0a 1 v\u1eadt c\u00f3 m = 0,3 t\u1ea5n l\u00ean \u0111\u1ed9 cao 1,5m. X\u00e1c \u0111\u1ecbnh qu\u00e3ng \u0111\u01b0\u1eddng s\u1ee3i d\u00e2y ph\u1ea3i \u0111i","select":["A. 3m","B. 6m","C. 9m","D. 12m"],"hint":"","explain":"<span class=\u2019basic_left\u2019>Ch\u00fa \u00fd: Khi s\u1eed d\u1ee5ng d\u00f2ng d\u1ecdc \u0111\u1ed9ng, s\u1ebd gi\u00fap ta k\u00e9o v\u1eadt l\u00ean cao v\u1edbi l\u1ef1c k\u00e9o ch\u1ec9 b\u1eb1ng 1\/2 tr\u1ecdng l\u1ef1c c\u1ee7a v\u1eadt. Gi\u1ea3 s\u1eed m\u1ed9t v\u1eadt c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng P, khi d\u00f9ng m\u1ed9t d\u00f2ng d\u1ecdc \u0111\u1ed9ng ta ch\u1ec9 c\u1ea7n l\u1ef1c k\u00e9o P\/2. V\u1eady khi d\u00f9ng 2 d\u00f2ng d\u1ecdc \u0111\u1ed9ng, \u1edf d\u00f2ng d\u1ecdc th\u1ee9 2 ta s\u1ebd coi nh\u01b0 k\u00e9o v\u1eadt P\/2 th\u00ec ta c\u1ea7n l\u1ef1c k\u00e9o (P\/2)\/2=P\/4. Khi d\u00f9ng 3 d\u00f2ng d\u1ecdc \u0111\u1ed9ng, l\u1ef1c k\u00e9o \u0111\u1ec3 k\u00e9o \u1edf d\u00f2ng d\u1ecdc th\u1ee9 3 l\u00e0 (P\/4)\/2=P\/8. V\u1eady khi s\u1eed d\u1ee5ng 3 d\u00f2ng d\u1ecdc ta s\u1ebd ch\u1ec9 c\u1ea7n l\u1ef1c k\u00e9o b\u1eb1ng 1\/8 khi k\u00e9o tr\u1ef1c ti\u1ebfp v\u1eadt.<br\/>V\u00ec r\u00f2ng r\u1ecdc \u0111\u1ed9ng cho ta l\u1ee3i 2 l\u1ea7n v\u1ec1 l\u1ef1c nh\u01b0ng thi\u1ec7t 2 l\u1ea7n v\u1ec1 \u0111\u01b0\u1eddng \u0111i n\u00ean 3 r\u00f2ng r\u1ecdc \u0111\u1ed9ng cho ta l\u1ee3i 2^3 = 8 l\u1ea7n v\u1ec1 l\u1ef1c v\u00e0 thi\u1ec7t 6 l\u1ea7n v\u1ec1 \u0111\u01b0\u1eddng \u0111i, r\u00f2ng r\u1ecdc c\u1ed1 \u0111\u1ecbnh ch\u1ec9 l\u00e0m thay \u0111\u1ed5i h\u01b0\u1edbng c\u1ee7a l\u1ef1c ch\u1ee9 kh\u00f4ng c\u00f3 t\u00e1c d\u1ee5ng l\u00e0m gi\u1ea3m hay t\u0103ng l\u1ef1c.<br\/>N\u00ean qu\u00e3ng \u0111\u01b0\u1eddng s\u1ee3i d\u00e2y ph\u1ea3i \u0111i l\u00e0: s = 8.h = 8.1,5 = 12(m)<br\/> <span class=\u2019basic_pink\u2019>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2440}],"lesson":{"save":0,"level":2}}