{"segment":[{"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":"C\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m \u0111\u1ed9 nghi\u00eang c\u1ee7a m\u1eb7t ph\u1eb3ng nghi\u00eang b\u1eb1ng c\u00e1ch:","select":["A. Gi\u1ea3m chi\u1ec1u cao k\u00ea m\u1eb7t ph\u1eb3ng nghi\u00eang","B. T\u0103ng chi\u1ec1u d\u00e0i c\u1ee7a m\u1eb7t ph\u1eb3ng nghi\u00eang","C. V\u1eeba gi\u1ea3m chi\u1ec1u cao, v\u1eeba t\u0103ng chi\u1ec1u d\u00e0i c\u1ee7a m\u1eb7t ph\u1eb3ng nghi\u00eang","D. C\u1ea3 3 ph\u01b0\u01a1ng \u00e1n tr\u00ean"],"hint":"","explain":"<span class='basic_left'>C\u1ea3 3 ph\u01b0\u01a1ng \u00e1n tr\u00ean \u0111\u1ec1u c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m \u0111\u1ed9 nghi\u00eang c\u1ee7a m\u1eb7t ph\u1eb3ng nghi\u00eang.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2401},{"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":"C\u00e1ch n\u00e0o trong c\u00e1c c\u00e1ch sau \u0111\u00e2y kh\u00f4ng l\u00e0m gi\u1ea3m \u0111\u01b0\u1ee3c \u0111\u1ed9 nghi\u00eang c\u1ee7a m\u1ed9t m\u1eb7t ph\u1eb3ng nghi\u00eang?","select":["A. T\u0103ng \u0111\u1ed9 d\u00e0i m\u1eb7t ph\u1eb3ng nghi\u00eang","B. Gi\u1ea3m \u0111\u1ed9 d\u00e0i m\u1eb7t ph\u1eb3ng nghi\u00eang","C. Gi\u1ea3m \u0111\u1ed9 cao k\u00ea m\u1eb7t ph\u1eb3ng nghi\u00eang","D. T\u0103ng \u0111\u1ed9 d\u00e0i m\u1eb7t ph\u1eb3ng nghi\u00eang v\u00e0 \u0111\u1ed3ng th\u1eddi gi\u1ea3m \u0111\u1ed9 cao k\u00ea m\u1eb7t ph\u1eb3ng nghi\u00eang"],"hint":"","explain":"<span class='basic_left'>Gi\u1ea3m \u0111\u1ed9 d\u00e0i m\u1eb7t ph\u1eb3ng nghi\u00eang s\u1ebd l\u00e0m t\u0103ng \u0111\u1ed9 nghi\u00eang c\u1ee7a m\u1ed9t m\u1eb7t ph\u1eb3ng nghi\u00eang.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2402},{"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\u1eb7t ph\u1eb3ng nghi\u00eang c\u00e0ng nghi\u00eang \u00edt th\u00ec l\u1ef1c c\u1ea7n \u0111\u1ec3 k\u00e9o v\u1eadt tr\u00ean m\u1eb7t ph\u1eb3ng nghi\u00eang ...","select":["A. c\u00e0ng gi\u1ea3m","B. c\u00e0ng t\u0103ng","C. kh\u00f4ng thay \u0111\u1ed5i","D. t\u1ea5t c\u1ea3 \u0111\u1ec1u \u0111\u00fang"],"hint":"","explain":"<span class='basic_left'>M\u1eb7t ph\u1eb3ng nghi\u00eang c\u00e0ng nghi\u00eang \u00edt th\u00ec l\u1ef1c c\u1ea7n \u0111\u1ec3 k\u00e9o v\u1eadt tr\u00ean m\u1eb7t ph\u1eb3ng nghi\u00eang c\u00e0ng gi\u1ea3m<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2403},{"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":" D\u00f9ng m\u1eb7t ph\u1eb3ng nghi\u00eang c\u00f3 th\u1ec3 l\u00e0m \u2026\u2026\u2026\u2026\u2026\u2026 t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c","select":["A. t\u0103ng","B. thay \u0111\u1ed5i h\u01b0\u1edbng","C. kh\u00f4ng \u0111\u1ed5i","D. l\u1ec7ch \u0111i"],"hint":"","explain":"<span class='basic_left'>D\u00f9ng m\u1eb7t ph\u1eb3ng nghi\u00eang c\u00f3 th\u1ec3 l\u00e0m thay \u0111\u1ed5i h\u01b0\u1edbng t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2404},{"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":"D\u00f9ng m\u1eb7t ph\u1eb3ng nghi\u00eang c\u00f3 th\u1ec3 k\u00e9o v\u1eadt l\u00ean v\u1edbi l\u1ef1c k\u00e9o:","select":["A. x\u1ea5p x\u1ec9 h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt","B. \u0111\u00fang b\u1eb1ng h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt","C. nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt","D. l\u1edbn h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt"],"hint":"","explain":"<span class='basic_left'>D\u00f9ng m\u1eb7t ph\u1eb3ng nghi\u00eang c\u00f3 th\u1ec3 k\u00e9o v\u1eadt l\u00ean v\u1edbi l\u1ef1c k\u00e9o nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2405},{"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":"D\u1ee5ng c\u1ee5 n\u00e0o sau \u0111\u00e2y l\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a m\u1eb7t ph\u1eb3ng nghi\u00eang?","select":["A. C\u00e1i k\u00e9o.","B. C\u1ea7u thang g\u00e1c.","C. M\u00e1i nh\u00e0.","D. C\u00e1i k\u00ecm."],"hint":"","explain":"<span class='basic_left'>C\u1ea7u thang g\u00e1c l\u00e0 d\u1ee5ng c\u1ee5 \u1ee9ng d\u1ee5ng c\u1ee7a m\u1eb7t ph\u1eb3ng nghi\u00eang.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2406},{"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":"D\u00f9ng m\u1eb7t ph\u1eb3ng nghi\u00eang \u0111\u1ec3 \u0111\u01b0a m\u1ed9t v\u1eadt n\u1eb7ng l\u00ean cao, c\u00f3 th\u1ec3:","select":["A. l\u00e0m thay \u0111\u1ed5i ph\u01b0\u01a1ng c\u1ee7a tr\u1ecdng l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean v\u1eadt","B. l\u00e0m gi\u1ea3m tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt","C. k\u00e9o v\u1eadt l\u00ean v\u1edbi l\u1ef1c k\u00e9o nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt","D. k\u00e9o v\u1eadt l\u00ean v\u1edbi l\u1ef1c k\u00e9o l\u1edbn h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt"],"hint":"","explain":"<span class='basic_left'>Khi d\u00f9ng m\u1eb7t ph\u1eb3ng nghi\u00eang \u0111\u1ec3 \u0111\u01b0a m\u1ed9t v\u1eadt n\u1eb7ng l\u00ean cao, ta c\u00f3 th\u1ec3 k\u00e9o v\u1eadt l\u00ean v\u1edbi l\u1ef1c k\u00e9o nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2407},{"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":"Bi\u1ebft \u0111\u1ed9 d\u00e0i c\u1ee7a m\u1eb7t ph\u1eb3ng nghi\u00eang l\u1edbn h\u01a1n \u0111\u1ed9 cao bao nhi\u00eau l\u1ea7n th\u00ec l\u1ef1c d\u00f9ng \u0111\u1ec3 k\u00e9o v\u1eadt l\u00ean cao c\u00f3 th\u1ec3 nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt b\u1ea5y nhi\u00eau l\u1ea7n. Mu\u1ed1n k\u00e9o m\u1ed9t v\u1eadt n\u1eb7ng 2000N l\u00ean cao 1,2m v\u1edbi l\u1ef1c k\u00e9o 500N th\u00ec ph\u1ea3i d\u00f9ng m\u1eb7t ph\u1eb3ng nghi\u00eang c\u00f3 \u0111\u1ed9 d\u00e0i l b\u1eb1ng bao nhi\u00eau?","select":["A. l > 4,8m","B. l < 4,8m","C. l = 4m","D. l= 2,4m"],"hint":"","explain":"<span class='basic_left'>L\u1ef1c k\u00e9o nh\u1ecf h\u01a1n 4 l\u1ea7n v\u1eady chi\u1ec1u d\u00e0i l ph\u1ea3i l\u1edbn h\u01a1n chi\u1ec1u cao h l\u00e0 4 l\u1ea7n t\u1ee9c l\u00e0 l > 4.1,2 = 4,8m.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2408},{"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":"S\u00e0n nh\u00e0 cao h\u01a1n m\u1eb7t \u0111\u01b0\u1eddng 50cm. \u0110\u1ec3 \u0111\u01b0a m\u1ed9t chi\u1ebfc xe m\u00e1y t\u1eeb m\u1eb7t \u0111\u01b0\u1eddng v\u00e0o nh\u00e0, ng\u01b0\u1eddi ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1eb7t ph\u1eb3ng nghi\u00eang c\u00f3 \u0111\u1ed9 d\u00e0i l v\u00e0 \u0111\u1ed9 cao h n\u00e0o sau \u0111\u00e2y?","select":["A. l < 50cm; h = 50cm","B. l = 50cm; h = 50cm","C. l > 50cm; h < 50cm","D. l > 50cm; h = 50cm"],"hint":"","explain":"<span class='basic_left'>\u0110\u1ec3 \u0111\u01b0a m\u1ed9t chi\u1ebfc xe m\u00e1y t\u1eeb m\u1eb7t \u0111\u01b0\u1eddng v\u00e0o nh\u00e0 ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1eb7t ph\u1eb3ng nghi\u00eang l > 50cm; h = 50cm.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2409},{"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":"\u0110\u1ec3 \u0111\u01b0a c\u00e1c th\u00f9ng \u0111\u1ef1ng d\u1ea7u l\u00ean xe t\u1ea3i, m\u1ed9t ng\u01b0\u1eddi \u0111\u00e3 l\u1ea7n l\u01b0\u1ee3t d\u00f9ng b\u1ed1n t\u1ea5m v\u00e1n l\u00e0m m\u1eb7t ph\u1eb3ng nghi\u00eang. Bi\u1ebft v\u1edbi b\u1ed1n t\u1ea5m v\u00e1n n\u00e0y ng\u01b0\u1eddi \u0111\u00f3 \u0111\u00e3 \u0111\u1ea9y th\u00f9ng d\u1ea7u \u0111i l\u00ean v\u1edbi c\u00e1c l\u1ef1c l\u1ea7n l\u01b0\u1ee3t l\u00e0: $F_1$ = 1000N; $F_2$ = 200N; $F_3$ = 500N; $F_4$ = 1200N. H\u1ecfi t\u1ea5m v\u00e1n n\u00e0o d\u00e0i nh\u1ea5t?","select":["A. T\u1ea5m v\u00e1n 1","B. T\u1ea5m v\u00e1n 2","C. T\u1ea5m v\u00e1n 3","D. T\u1ea5m v\u00e1n 4"],"hint":"","explain":"<span class='basic_left'>T\u1ea5m v\u00e1n n\u00e0o d\u00e0i nh\u1ea5t ph\u1ea3i \u1ee9ng v\u1edbi l\u1ef1c \u0111\u1ea9y b\u00e9 nh\u1ea5t t\u1ee9c l\u00e0 tr\u01b0\u1eddng h\u1ee3p d\u00f9ng t\u1ea5m v\u00e1n 2 v\u1edbi l\u1ef1c $F_2$ = 200N.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2410}],"lesson":{"save":0,"level":2}}