{"segment":[{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":10,"ques":"Ch\u1ecdn ph\u00e1t bi\u1ec3u sai khi n\u00f3i v\u1ec1 t\u00e1c d\u1ee5ng c\u1ee7a \u0111\u00f2n b\u1ea9y.","select":["A. T\u00e1c d\u1ee5ng c\u1ee7a \u0111\u00f2n b\u1ea9y l\u00e0 gi\u1ea3m l\u1ef1c k\u00e9o ho\u1eb7c \u0111\u1ea9y v\u1eadt ","B. T\u00e1c d\u1ee5ng c\u1ee7a \u0111\u00f2n b\u1ea9y l\u00e0 t\u0103ng l\u1ef1c k\u00e9o ho\u1eb7c \u0111\u1ea9y v\u1eadt ","C. \u0110\u00f2n b\u1ea9y c\u00f3 t\u00e1c d\u1ee5ng l\u00e0m thay \u0111\u1ed5i h\u01b0\u1edbng c\u1ee7a l\u1ef1c v\u00e0o v\u1eadt","D. D\u00f9ng \u0111\u00f2n b\u1ea9y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u1ee3i v\u1ec1 l\u1ef1c"],"hint":"","explain":"<span class='basic_left'>T\u00e1c d\u1ee5ng c\u1ee7a \u0111\u00f2n b\u1ea9y l\u00e0 gi\u1ea3m l\u1ef1c k\u00e9o ho\u1eb7c \u0111\u1ea9y c\u1ea7n \u0111\u1ec3 n\u00e2ng v\u1eadt.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2411},{"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":"Ch\u1ecdn t\u1eeb th\u00edch h\u1ee3p \u0111\u1ec3 \u0111i\u1ec1n v\u00e0o ch\u1ed3 tr\u1ed1ng c\u1ee7a c\u00e2u sau :<br\/> Mu\u1ed1n l\u1ef1c n\u00e2ng v\u1eadt (1) ..........tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt th\u00ec ph\u1ea3i l\u00e0m cho kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m t\u1ef1a t\u1edbi \u0111i\u1ec3m t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c n\u00e2ng (2)........ kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m t\u1ef1a t\u1edbi \u0111i\u1ec3m t\u00e1c d\u1ee5ng c\u1ee7a tr\u1ecdng l\u01b0\u1ee3ng v\u1eadt.","select":["A. 1) Nh\u1ecf h\u01a1n 2) L\u1edbn h\u01a1n ","B.(1) Nh\u1ecf h\u01a1n (2) nh\u1ecf h\u01a1n ","C. 1) L\u1edbn h\u01a1n (2) L\u1edbn h\u01a1n ","D. 1) L\u1edbn h\u01a1n (2) nh\u1ecf h\u01a1n"],"hint":"","explain":"<span class='basic_left'>: Mu\u1ed1n l\u1ef1c n\u00e2ng v\u1eadt nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt th\u00ec ph\u1ea3i l\u00e0m cho kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m t\u1ef1a t\u1edbi \u0111i\u1ec3m t\u00e1c d\u1ee5ng cua l\u1ef1c n\u00e2ng l\u1edbn h\u01a1n kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m t\u1ef1a t\u1edbi \u0111i\u1ec3m t\u00e1c d\u1ee5ng c\u1ee7a tr\u1ecdng l\u01b0\u1ee3ng v\u1eadt.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2412},{"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":"\u0110i\u1ec1u ki\u1ec7n n\u00e0o sau \u0111\u00e2y gi\u00fap ng\u01b0\u1eddi s\u1eed d\u1ee5ng \u0111\u00f2n b\u1ea9y \u0111\u1ec3 n\u00e2ng v\u1eadt l\u00ean v\u1edbi l\u1ef1c nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt ?","select":["A. Khi $O{{O}_{2}}$ < $O{{O}_{1}}$ th\u00ec ${{F}_{2}}$ < ${{F}_{1}}$","B. Khi $O{{O}_{2}}$ = $O{{O}_{1}}$ th\u00ec ${{F}_{1}}$ = ${{F}_{2}}$","C. Khi $O{{O}_{2}}$>$O{{O}_{1}}$ th\u00ec ${{F}_{2}}$< ${{F}_{1}}$","D. Khi $O{{O}_{2}}$ > $O{{O}_{1}}$ th\u00ec ${{F}_{1}}$ < ${{F}_{2}}$"],"hint":"","explain":"<span class='basic_left'>Khi $O{{O}_{2}}$>$O{{O}_{1}}$ th\u00ec ${{F}_{2}}$< ${{F}_{1}}$ ngh\u0129a l\u00e0 khi kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m t\u1ef1a \u0111\u1ebfn \u0111i\u1ec3m t\u00e1c d\u1ee5ng l\u1ef1c l\u1edbn h\u01a1n kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m t\u1ef1a \u0111\u1ebfn \u0111i\u1ec3m \u0111\u1eb7t v\u1eadt th\u00ec l\u1ef1c t\u00e1c d\u1ee5ng nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng v\u1eadt.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2413},{"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":"V\u1eadt n\u00e0o sau \u0111\u00e2y l\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a \u0111\u00f2n b\u1ea9y ?","select":["A. C\u1ea7u tr\u01b0\u1ee3t","B. \u0110\u1ea9y xe l\u00ean nh\u00e0 b\u1eb1ng t\u1ea5m v\u00e1n","C. B\u00e1nh xe \u1edf \u0111\u1ec9nh c\u1ed9t c\u1edd","D. K\u00ecm b\u1ea5m gi\u1ea5y"],"hint":"","explain":"<span class='basic_left'><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2414},{"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":"\u0110\u00f2n b\u1ea9y lu\u00f4n c\u00f3.......v\u00e0 c\u00f3........t\u00e1c d\u1ee5ng v\u00e0o n\u00f3:","select":["A. \u0111i\u1ec3m t\u1ef1a-c\u00e1nh tay \u0111\u00f2n","B. l\u1ef1c-\u0111\u1ed9 d\u00e0i","C. \u0111i\u1ec3m t\u1ef1a-l\u1ef1c","D. \u0111\u1ed9 d\u00e0i-\u0111i\u1ec3m t\u1ef1a"],"hint":"","explain":"<span class='basic_left'>\u0110\u00f2n b\u1ea9y lu\u00f4n c\u00f3 \u0111i\u1ec3m t\u1ef1a v\u00e0 c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng v\u00e0o n\u00f3.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2415},{"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":"Mu\u1ed1n b\u1ea9y m\u1ed9t v\u1eadt n\u1eb7ng 2000N b\u1eb1ng m\u1ed9t l\u1ef1c 500N th\u00ec ph\u1ea3i d\u00f9ng \u0111\u00f2n b\u1ea9y c\u00f3:","select":["A. $O{{O}_{2}}$ = $O{{O}_{1}}$ ","B. $O{{O}_{2}}$ > 4$O{{O}_{1}}$ ","C. $O{{O}_{1}}$ > 4$O{{O}_{2}}$ ","D. 4$O{{O}_{1}}$ > $O{{O}_{2}}$ > 2$O{{O}_{1}}$."],"hint":"","explain":"<span class='basic_left'>ph\u1ea3i d\u00f9ng \u0111\u00f2n b\u1ea9y c\u00f3: $O{{O}_{2}}$ > 4$O{{O}_{1}}$ ho\u1eb7c $O{{O}_{2}}$ = 4$O{{O}_{1}}$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2416},{"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\u00e2n n\u00e0o sau \u0111\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t \u1ee9ng d\u1ee5ng c\u1ee7a \u0111\u00f2n b\u1ea9y? ","select":["A. C\u00e2n R\u00f4-b\u00e9c-van.","B. C\u00e2n \u0111\u1ed3ng h\u1ed3.","C. C\u00e2n \u0111\u00f2n.","D. C\u00e2n t\u1ea1."],"hint":"","explain":"<span class='basic_left'>Trong c\u00e1c lo\u1ea1i c\u00e2n tr\u00ean th\u00ec c\u00e2n \u0111\u1ed3ng h\u1ed3 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t \u1ee9ng d\u1ee5ng c\u1ee7a \u0111\u00f2n b\u1ea9y v\u00ec \u0111\u00e2y l\u00e0 \u1ee9ng d\u1ee5ng v\u1ec1 l\u1ef1c \u0111\u00e0n h\u1ed3i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2417},{"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":"M\u00e1y c\u01a1 \u0111\u01a1n gi\u1ea3n n\u00e0o sau \u0111\u00e2y kh\u00f4ng cho l\u1ee3i v\u1ec1 l\u1ef1c?","select":["A. \u0110\u00f2n b\u1ea9y","B. M\u1eb7t ph\u1eb3ng nghi\u00eang","C. R\u00f2ng r\u1ecdc c\u1ed1 \u0111\u1ecbnh","D. R\u00f2ng r\u1ecdc \u0111\u1ed9ng"],"hint":"","explain":"<span class='basic_left'>R\u00f2ng r\u1ecdc \u0111\u1ed9ng ch\u1ec9 l\u00e0m thay \u0111\u1ed5i h\u01b0\u1edbng c\u1ee7a l\u1ef1c.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2418},{"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":"Trong c\u00e1c d\u1ee5ng c\u1ee5 sau \u0111\u00e2y, d\u1ee5ng c\u1ee5 n\u00e0o kh\u00f4ng th\u1ec3 coi l\u00e0 1 \u0111\u00f2n b\u1ea9y?","select":["A. c\u00e1i k\u00ecm","B. c\u00e1i c\u00e2n \u0111\u00f2n","C. c\u00e1i k\u00e9o","D. c\u00e1i c\u1ea7u thang g\u00e1c"],"hint":"","explain":"<span class='basic_left'>C\u00e1i c\u1ea7u thang g\u00e1c l\u00e0 \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 D.<\/span><\/span> ","column":2}]}],"id_ques":2419},{"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":"M\u1ed9t ng\u01b0\u1eddi g\u00e1nh m\u1ed9t g\u00e1nh n\u01b0\u1edbc. Th\u00f9ng th\u1ee9 nh\u1ea5t n\u1eb7ng 20kg, th\u00f9ng th\u1ee9 hai n\u1eb7ng 30kg. G\u1ecdi \u0111i\u1ec3m ti\u1ebfp x\u00fac gi\u1eefa vai v\u1edbi \u0111\u00f2n g\u00e1nh l\u00e0 O, \u0111i\u1ec3m treo th\u00f9ng th\u1ee9 nh\u1ea5t v\u00e0o \u0111\u00f2n g\u00e1nh l\u00e0 ${{O}_{1}}$, \u0111i\u1ec3m treo th\u00f9ng th\u1ee9 hai v\u00e0o \u0111\u00f2n g\u00e1nh l\u00e0 ${{O}_{2}}$. H\u1ecfi $O{{O}_{1}}$ v\u00e0 $O{{O}_{2}}$ c\u00f3 gi\u00e1 tr\u1ecb n\u00e0o sau \u0111\u00e2y th\u00ec g\u00e1nh n\u01b0\u1edbc c\u00e2n b\u1eb1ng?","select":["A. $O{{O}_{1}}$ = 90cm, $O{{O}_{2}}$ = 90cm.","B. $O{{O}_{1}}$ = 90cm, $O{{O}_{2}}$ = 60cm.","C. $O{{O}_{1}}$ = 60cm, $O{{O}_{2}}$ = 90cm.","D. $O{{O}_{1}}$ = 60cm, $O{{O}_{2}}$ = 120cm."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ec3 g\u00e1nh n\u01b0\u1edbc c\u00e2n b\u1eb1ng th\u00ec $O{{O}_{1}}$ v\u00e0 $O{{O}_{2}}$ c\u00f3 gi\u00e1 tr\u1ecb $O{{O}_{1}}$= 90cm, $O{{O}_{2}}$ = 60cm.V\u00ec khi \u0111\u00f3 $P_1d_1$ = $P_2d_2$ \u21d2 200.90 =300.60<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2420}],"lesson":{"save":0,"level":2}}