{"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":5,"ques":"D\u00f9ng quy t\u1eafc n\u00e0o d\u01b0\u1edbi \u0111\u00e2y \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh chi\u1ec1u c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb? ","select":["A. Quy t\u1eafc n\u1eafm tay ph\u1ea3i.","B. Quy t\u1eafc n\u1eafm tay tr\u00e1i.","C. Quy t\u1eafc b\u00e0n tay ph\u1ea3i.","D. Quy t\u1eafc b\u00e0n tay tr\u00e1i."],"hint":"","explain":"<span class='basic_left'>D\u00f9ng quy t\u1eafc b\u00e0n tay tr\u00e1i \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh chi\u1ec1u c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3171},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai27/lv2/img\/h2.jpg'\/><\/center>H\u00ecnh 27.1 m\u00f4 t\u1ea3 khung d\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u01b0\u1ee3c \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng, trong \u0111\u00f3 khung quay \u0111ang c\u00f3 v\u1ecb tr\u00ed m\u00e0 m\u1eb7t ph\u1eb3ng khung vu\u00f4ng g\u00f3c v\u1edbi \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb. V\u1ebd v\u1ecb tr\u00ed n\u00e0y c\u1ee7a khung d\u00e2y, \u00fd ki\u1ebfn n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0 \u0111\u00fang? ","select":["A. Khung kh\u00f4ng ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb.","B. Khung ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb nh\u01b0ng n\u00f3 kh\u00f4ng quay.","C. Khung ti\u1ebfp t\u1ee5c quay do t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb l\u00ean khung.","D. Khung quay ti\u1ebfp m\u1ed9t ch\u00fat n\u1eefa nh\u01b0ng kh\u00f4ng ph\u1ea3i do t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb m\u00e0 do qu\u00e1n t\u00ednh."],"hint":"","explain":"<span class='basic_left'>Khung d\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng th\u00ec c\u00f3 l\u1ef1c \u0111i\u1ec7n t\u1eeb t\u00e1c d\u1ee5ng l\u00ean n\u00f3. Khung quay \u0111ang c\u00f3 v\u1ecb tr\u00ed m\u00e0 m\u1eb7t ph\u1eb3ng khung vu\u00f4ng g\u00f3c v\u1edbi \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb (t\u1ee9c l\u00e0 m\u1eb7t ph\u1eb3ng khung n\u1eb1m trong m\u1eb7t ph\u1eb3ng trung h\u00f2a) th\u00ec l\u1ef1c \u0111i\u1ec7n t\u1eeb kh\u00f4ng l\u00e0m cho khung quay quanh tr\u1ee5c c\u1ee7a n\u00f3.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3172},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Mu\u1ed1n x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c chi\u1ec1u c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t \u0111o\u1ea1n d\u00e2y d\u1eabn th\u1eb3ng c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u1eb7t t\u1ea1i m\u1ed9t \u0111i\u1ec3m trong t\u1eeb tr\u01b0\u1eddng th\u00ec c\u1ea7n ph\u1ea3i bi\u1ebft nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0o?","select":["A. Chi\u1ec1u c\u1ee7a d\u00f2ng \u0111i\u1ec7n trong d\u00e2y d\u1eabn v\u00e0 chi\u1ec1u c\u1ee7a d\u00e2y.","B. Chi\u1ec1u c\u1ee7a \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 l\u1ef1c \u0111i\u1ec7n t\u1eeb t\u1ea1i \u0111i\u1ec3m \u0111\u00f3.","C. Chi\u1ec1u c\u1ee7a d\u00f2ng \u0111i\u1ec7n v\u00e0 chi\u1ec1u c\u1ee7a \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb t\u1ea1i \u0111i\u1ec3m \u0111\u00f3.","D. Chi\u1ec1u v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a d\u00f2ng \u0111i\u1ec7n, chi\u1ec1u v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a l\u1ef1c t\u1eeb t\u1ea1i \u0111i\u1ec3m \u0111\u00f3."],"hint":"","explain":"<span class='basic_left'>Mu\u1ed1n x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c chi\u1ec1u c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t \u0111o\u1ea1n d\u00e2y d\u1eabn th\u1eb3ng c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u1eb7t t\u1ea1i m\u1ed9t \u0111i\u1ec3m trong t\u1eeb tr\u01b0\u1eddng th\u00ec c\u1ea7n ph\u1ea3i bi\u1ebft nh\u1eefng y\u1ebfu t\u1ed1: Chi\u1ec1u c\u1ee7a d\u00f2ng \u0111i\u1ec7n v\u00e0 chi\u1ec1u c\u1ee7a \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb t\u1ea1i \u0111i\u1ec3m \u0111\u00f3.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3173},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Khi d\u00e2y d\u1eabn th\u1eb3ng c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u01b0\u1ee3c \u0111\u1eb7t song song v\u1edbi c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb th\u00ec l\u1ef1c \u0111i\u1ec7n t\u1eeb c\u00f3 h\u01b0\u1edbng nh\u01b0 th\u1ebf n\u00e0o?","select":["A. C\u00f9ng h\u01b0\u1edbng v\u1edbi d\u00f2ng \u0111i\u1ec7n.","B. C\u00f9ng h\u01b0\u1edbng v\u1edbi \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb.","C. Vu\u00f4ng g\u00f3c v\u1edbi c\u1ea3 d\u00e2y d\u1eabn v\u00e0 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb.","D. Kh\u00f4ng c\u00f3 l\u1ef1c \u0111i\u1ec7n t\u1eeb."],"hint":"","explain":"<span class='basic_left'>Khi d\u00e2y d\u1eabn th\u1eb3ng c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u01b0\u1ee3c \u0111\u1eb7t song song v\u1edbi c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb th\u00ec kh\u00f4ng c\u00f3 l\u1ef1c \u0111i\u1ec7n t\u1eeb.<br\/>V\u00ec d\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng v\u00e0 song song v\u1edbi \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb th\u00ec kh\u00f4ng ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3174},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"M\u1ed9t khung d\u00e2y d\u1eabn h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u01b0\u1ee3c \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng gi\u1eefa hai nh\u00e1nh c\u1ee7a m\u1ed9t nam ch\u00e2m h\u00ecnh ch\u1eef U. Khung d\u00e2y s\u1ebd quay \u0111\u1ebfn v\u1ecb tr\u00ed n\u00e0o th\u00ec d\u1eebng l\u1ea1i.","select":["A. M\u1eb7t khung d\u00e2y song song v\u1edbi c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb.","B. M\u1eb7t khung d\u00e2y vu\u00f4ng g\u00f3c v\u1edbi c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb.","C. M\u1eb7t khung d\u00e2y t\u1ea1o th\u00e0nh m\u1ed9t g\u00f3c $60{}^\\circ $ v\u1edbi \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb.","D. M\u1eb7t khung d\u00e2y t\u1ea1o th\u00e0nh m\u1ed9t g\u00f3c $40{}^\\circ $ v\u1edbi \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb."],"hint":"","explain":"<span class='basic_left'>M\u1ed9t khung d\u00e2y d\u1eabn h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u01b0\u1ee3c \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng gi\u1eefa hai nh\u00e1nh c\u1ee7a m\u1ed9t nam ch\u00e2m h\u00ecnh ch\u1eef U. Khung d\u00e2y s\u1ebd d\u1eebng l\u1ea1i khi quay \u0111\u1ebfn v\u1ecb tr\u00ed m\u1eb7t khung d\u00e2y vu\u00f4ng g\u00f3c v\u1edbi c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb.<br\/>V\u00ec l\u1ef1c \u0111i\u1ec7n t\u1eeb l\u00e0m cho khung quay quanh tr\u1ee5c c\u1ee7a n\u00f3. Tr\u1eeb m\u1ed9t v\u1ecb tr\u00ed duy nh\u1ea5t \u0111\u00f3 l\u00e0 khi m\u1eb7t ph\u1eb3ng khung vu\u00f4ng g\u00f3c v\u1edbi \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb (t\u1ee9c l\u00e0 m\u1eb7t ph\u1eb3ng khung n\u1eb1m trong m\u1eb7t ph\u1eb3ng trung h\u00f2a).<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3175},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai27/lv2/img\/h6.jpg'\/><\/center>Khi d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua khung d\u00e2y d\u1eabn ABCD n\u1eb1m ngang, song song v\u1edbi \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb c\u1ee7a nam ch\u00e2m. H\u00e3y cho bi\u1ebft l\u1ef1c \u0111i\u1ec7n t\u1eeb F t\u00e1c d\u1ee5ng l\u00ean AB theo chi\u1ec1u n\u00e0o ?","select":["A. Ph\u01b0\u01a1ng n\u1eb1m ngang, chi\u1ec1u sang tr\u00e1i.","B. Ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng, chi\u1ec1u \u0111i xu\u1ed1ng.","C. Ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng, chi\u1ec1u \u0111i l\u00ean.","D. Ph\u01b0\u01a1ng n\u1eb1m ngang, chi\u1ec1u sang ph\u1ea3i."],"hint":"","explain":"<span class='basic_left'>\u00c1p d\u1ee5ng quy t\u1eafc b\u00e0n tay tr\u00e1i. Ta c\u00f3 t\u1eeb tr\u01b0\u1eddng h\u01b0\u1edbng t\u1eeb N sang S. D\u00f2ng \u0111i\u1ec7n \u0111i t\u1eeb A \u0111\u1ebfn B, n\u00ean l\u1ef1c t\u1eeb c\u00f3 ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng, chi\u1ec1u \u0111i xu\u1ed1ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3176},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p n\u00e0o k\u1ec3 sau, l\u1ef1c \u0111i\u1ec7n t\u1eeb t\u00e1c d\u1ee5ng v\u00e0o d\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n s\u1ebd kh\u00f4ng \u0111\u1ed5i chi\u1ec1u ?","select":["A. \u0110\u1ed5i chi\u1ec1u \u0111\u1ed3ng th\u1eddi c\u1ea3 d\u00f2ng \u0111i\u1ec7n v\u00e0 t\u1eeb tr\u01b0\u1eddng.","B. \u0110\u1ed5i chi\u1ec1u d\u00f2ng \u0111i\u1ec7n trong d\u00e2y d\u1eabn.","C. \u0110\u1ed5i chi\u1ec1u t\u1eeb tr\u01b0\u1eddng.","D. Kh\u00f4ng c\u00f3 tr\u01b0\u1eddng h\u1ee3p n\u00e0o."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ed5i chi\u1ec1u \u0111\u1ed3ng th\u1eddi c\u1ea3 d\u00f2ng \u0111i\u1ec7n v\u00e0 t\u1eeb tr\u01b0\u1eddng th\u00ec l\u1ef1c \u0111i\u1ec7n t\u1eeb t\u00e1c d\u1ee5ng v\u00e0o d\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n s\u1ebd kh\u00f4ng \u0111\u1ed5i chi\u1ec1u. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3177},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Chi\u1ec1u c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb t\u00e1c d\u1ee5ng l\u00ean d\u00e2y d\u1eabn ph\u1ee5 thu\u1ed9c v\u00e0o?","select":["A. Chi\u1ec1u d\u00f2ng \u0111i\u1ec7n qua d\u00e2y d\u1eabn.","B. Chi\u1ec1u \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb qua d\u00e2y d\u1eabn.","C. Chi\u1ec1u chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a d\u00e2y d\u1eabn.","D. Chi\u1ec1u c\u1ee7a d\u00f2ng \u0111i\u1ec7n qua d\u00e2y d\u1eabn v\u00e0 chi\u1ec1u c\u1ee7a \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb."],"hint":"","explain":"<span class='basic_left'>Chi\u1ec1u c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb t\u00e1c d\u1ee5ng l\u00ean d\u00e2y d\u1eabn ph\u1ee5 thu\u1ed9c v\u00e0o chi\u1ec1u c\u1ee7a d\u00f2ng \u0111i\u1ec7n qua d\u00e2y d\u1eabn v\u00e0 chi\u1ec1u c\u1ee7a \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3178},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Theo quy t\u1eafc n\u1eafm b\u00e0n tay tr\u00e1i: \u0110\u1eb7t b\u00e0n tay tr\u00e1i sao cho c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb h\u01b0\u1edbng v\u00e0o l\u00f2ng b\u00e0n tay, chi\u1ec1u t\u1eeb c\u1ed5 tay \u0111\u1ebfn ng\u00f3n tay gi\u1eefa h\u01b0\u1edbng theo chi\u1ec1u d\u00f2ng \u0111i\u1ec7n th\u00ec chi\u1ec1u c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb l\u00e0?","select":["A. Chi\u1ec1u c\u1ee7a d\u00f2ng \u0111i\u1ec7n.","B. Ng\u01b0\u1ee3c chi\u1ec1u d\u00f2ng \u0111i\u1ec7n.","C. Chi\u1ec1u h\u01b0\u1edbng v\u00e0o l\u00f2ng b\u00e0n tay.","D. L\u00e0 chi\u1ec1u c\u1ee7a ng\u00f3n tay c\u00e1i cho\u00e3i ra $90{}^\\circ $."],"hint":"","explain":"<span class='basic_left'>Theo quy t\u1eafc n\u1eafm b\u00e0n tay tr\u00e1i: \u0110\u1eb7t b\u00e0n tay tr\u00e1i sao cho c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb h\u01b0\u1edbng v\u00e0o l\u00f2ng b\u00e0n tay, chi\u1ec1u t\u1eeb c\u1ed5 tay \u0111\u1ebfn ng\u00f3n tay gi\u1eefa h\u01b0\u1edbng theo chi\u1ec1u d\u00f2ng \u0111i\u1ec7n th\u00ec chi\u1ec1u c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb l\u00e0 chi\u1ec1u c\u1ee7a ng\u00f3n tay c\u00e1i cho\u00e3i ra $90{}^\\circ $.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3179},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Theo quy t\u1eafc b\u00e0n tay tr\u00e1i th\u00ec ng\u00f3n tay c\u00e1i cho\u00e3i ra ch\u1ec9 chi\u1ec1u n\u00e0o d\u01b0\u1edbi \u0111\u00e2y?","select":["A. Chi\u1ec1u c\u1ef1c Nam \u0111\u1ebfn c\u1ef1c B\u1eafc c\u1ee7a nam ch\u00e2m.","B. Chi\u1ec1u d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua d\u00e2y d\u1eabn.","C. Chi\u1ec1u c\u1ee7a l\u1ef1c t\u1eeb t\u00e1c d\u1ee5ng l\u00ean d\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua.","D. Chi\u1ec1u t\u1eeb c\u1ef1c B\u1eafc \u0111\u1ebfn c\u1ef1c Nam c\u1ee7a nam ch\u00e2m."],"hint":"","explain":"<span class='basic_left'>Theo quy t\u1eafc b\u00e0n tay tr\u00e1i th\u00ec ng\u00f3n tay c\u00e1i cho\u00e3i ra ch\u1ec9 chi\u1ec1u c\u1ee7a l\u1ef1c t\u1eeb t\u00e1c d\u1ee5ng l\u00ean d\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3180},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Theo quy t\u1eafc b\u00e0n tay tr\u00e1i, chi\u1ec1u t\u1eeb c\u1ed5 tay \u0111\u1ebfn ng\u00f3n tay gi\u1eefa h\u01b0\u1edbng theo:","select":["A. Chi\u1ec1u c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb.","B. Chi\u1ec1u c\u1ee7a \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb.","C. Chi\u1ec1u c\u1ee7a d\u00f2ng \u0111i\u1ec7n.","D. Chi\u1ec1u c\u1ee7a \u0111\u01b0\u1eddng \u0111i v\u00e0o c\u00e1c c\u1ef1c c\u1ee7a nam ch\u00e2m."],"hint":"","explain":"<span class='basic_left'>Theo quy t\u1eafc b\u00e0n tay tr\u00e1i, chi\u1ec1u t\u1eeb c\u1ed5 tay \u0111\u1ebfn ng\u00f3n tay gi\u1eefa h\u01b0\u1edbng theo chi\u1ec1u c\u1ee7a d\u00f2ng \u0111i\u1ec7n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3181},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai27/lv2/img\/h8.jpg'\/><\/center>D\u00f2ng \u0111i\u1ec7n ch\u1ea1y trong d\u00e2y d\u1eabn CD \u0111\u01b0\u1ee3c \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng c\u1ee7a nam ch\u00e2m (H\u00ecnh v\u1ebd). H\u00e3y ch\u1ecdn c\u00e1ch bi\u1ec3u di\u1ec5n l\u1ef1c \u0111i\u1ec7n t\u1eeb c\u1ee7a ch\u00fang.","select":["A. ${{F}_{t}}$ h\u01b0\u1edbng sang tr\u00e1i","B. ${{F}_{t}}$ h\u01b0\u1edbng sang ph\u1ea3i","C. ${{F}_{t}}$ h\u01b0\u1edbng l\u00ean tr\u00ean","D. ${{F}_{t}}$ h\u01b0\u1edbng xu\u1ed1ng d\u01b0\u1edbi"],"hint":"","explain":"<span class='basic_left'>\u00c1p d\u1ee5ng quy t\u1eafc b\u00e0n tay tr\u00e1i. Ta c\u00f3 t\u1eeb tr\u01b0\u1eddng h\u01b0\u1edbng t\u1eeb N sang S. D\u00f2ng \u0111i\u1ec7n \u0111i t\u1eeb C \u0111\u1ebfn D, n\u00ean l\u1ef1c t\u1eeb c\u00f3 ph\u01b0\u01a1ng n\u1eb1m ngang, h\u01b0\u1edbng sang tr\u00e1i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3182},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"L\u1ef1c n\u00e0o sau \u0111\u00e2y l\u00e0 l\u1ef1c \u0111i\u1ec7n t\u1eeb ?","select":["A. C\u1ea3 3 \u0111\u00e1p \u00e1n.","B. L\u1ef1c do hai \u1ed1ng d\u00e2y c\u00f3 d\u00f2ng \u0111i\u1ec7n t\u00e1c d\u1ee5ng l\u1eabn nhau.","C. L\u1ef1c do nam ch\u00e2m t\u00e1c d\u1ee5ng l\u00ean d\u00e2y \u0111i\u1ec7n c\u00f3 d\u00f2ng \u0111i\u1ec7n.","D. L\u1ef1c do \u1ed1ng d\u00e2y c\u00f3 d\u00f2ng \u0111i\u1ec7n t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t d\u00e2y \u0111i\u1ec7n kh\u00e1c c\u00f3 d\u00f2ng \u0111i\u1ec7n."],"hint":"","explain":"<span class='basic_left'> \u0110\u1ec1u l\u00e0 l\u1ef1c t\u1eeb do t\u01b0\u01a1ng t\u00e1c gi\u1eefa d\u00f2ng \u0111i\u1ec7n v\u1edbi d\u00f2ng \u0111i\u1ec7n ho\u1eb7c nam ch\u00e2m l\u00ean d\u00f2ng \u0111i\u1ec7n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3183},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai27/lv2/img\/h11.jpg'\/><\/center>\u0110o\u1ea1n d\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua. H\u00e3y cho bi\u1ebft l\u1ef1c t\u1eeb v\u1ebd \u1edf h\u00ecnh n\u00e0o \u0111\u00fang. ","select":["A. H\u00ecnh b.","B. H\u00ecnh a.","C. C\u1ea3 3 h\u00ecnh a, b, c.","D. H\u00ecnh c."],"hint":"","explain":"<span class='basic_left'>\u00c1p d\u1ee5ng quy t\u1eafc b\u00e0n tay tr\u00e1i. Ta c\u00f3 t\u1eeb tr\u01b0\u1eddng h\u01b0\u1edbng t\u1eeb N sang S. D\u00f2ng \u0111i\u1ec7n \u0111i t\u1eeb tr\u01b0\u1edbc ra sau, n\u00ean l\u1ef1c t\u1eeb c\u00f3 ph\u01b0\u01a1ng n\u1eb1m ngang, h\u01b0\u1edbng sang ph\u1ea3i<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3184},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"H\u00e3y ch\u1ecdn c\u00e2u ph\u00e1t bi\u1ec3u kh\u00f4ng \u0111\u00fang.","select":["A. T\u00e1c d\u1ee5ng c\u1ee7a d\u00f2ng \u0111i\u1ec7n ch\u1ee9ng t\u1ecf r\u1eb1ng ch\u1eb3ng nh\u1eefng xung quanh nam ch\u00e2m c\u00f3 t\u1eeb tr\u01b0\u1eddng m\u00e0 xung quanh d\u00f2ng \u0111i\u1ec7n c\u0169ng c\u00f3 t\u1eeb tr\u01b0\u1eddng.","B. D\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng v\u00e0 kh\u00f4ng song song v\u1edbi \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb th\u00ec ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb.","C. \u1ed0ng d\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua c\u00f3 t\u00e1c d\u1ee5ng nh\u01b0 m\u1ed9t thanh nam ch\u00e2m.","D. D\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u1eb7t b\u1ea5t c\u1ee9 \u1edf v\u1ecb tr\u00ed n\u00e0o trong t\u1eeb tr\u01b0\u1eddng c\u0169ng ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb."],"hint":"","explain":"<span class='basic_left'>D\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u1eb7t song song v\u1edbi t\u1eeb tr\u01b0\u1eddng th\u00ec kh\u00f4ng ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3185},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai27/lv2/img\/h13.jpg'\/><\/center>","select":["A. H\u00ecnh a.","B. H\u00ecnh b.","C. H\u00ecnh c.","D. H\u00ecnh d."],"hint":"","explain":"<span class='basic_left'>D\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua v\u00e0 \u0111\u1eb7t kh\u00f4ng song song v\u1edbi t\u1eeb tr\u01b0\u1eddng th\u00ec ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3186},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"M\u1ed9t \u0111o\u1ea1n d\u00e2y d\u1eabn \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng. \u0110o\u1ea1n d\u00e2y kh\u00f4ng ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb. K\u1ebft lu\u1eadn n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0 \u0111\u00fang ?","select":["A. Kh\u00f4ng th\u1ec3 c\u00f3 t\u00ecnh hu\u1ed1ng n\u00e0y (3).","B. \u0110o\u1ea1n d\u00e2y kh\u00f4ng c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua (1). ","C. \u0110o\u1ea1n d\u00e2y c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua v\u00e0 song song v\u1edbi \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb (2).","D. C\u1ea3 (1) v\u00e0 (2)."],"hint":"","explain":"<span class='basic_left'>\u0110o\u1ea1n d\u00e2y kh\u00f4ng c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua ho\u1eb7c \u0111o\u1ea1n d\u00e2y c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua v\u00e0 song song v\u1edbi \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3187},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai27/lv2/img\/h15.jpg'\/><\/center>H\u00ecnh 27.2 m\u00f4 t\u1ea3 \u0111o\u1ea1n d\u00e2y d\u1eabn AB c\u00f3 d\u00f2ng \u0111i\u1ec7n \u0111i qua \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf kh\u1ecfang gi\u1eefa hai c\u1ef1c c\u1ee7a nam ch\u00e2m h\u00ecnh ch\u1eef U. Bi\u1ec3u di\u1ec5n l\u1ef1c \u0111i\u1ec7n t\u1eeb t\u00e1c d\u1ee5ng v\u00e0o AB. N\u1ebfu \u0111\u1ed5i chi\u1ec1u d\u00f2ng \u0111i\u1ec7n ho\u1eb7c \u0111\u1ed5i c\u1ef1c c\u1ee7a nam ch\u00e2m th\u00ec l\u1ef1c \u0111i\u1ec7n t\u1eeb s\u1ebd ra sao?","select":["A. L\u1ef1c \u0111i\u1ec7n t\u1eeb c\u00f3 chi\u1ec1u \u0111i t\u1eeb ngo\u00e0i v\u00e0o trong l\u00f2ng nam ch\u00e2m. N\u1ebfu \u0111\u1ed5i chi\u1ec1u d\u00f2ng \u0111i\u1ec7n ho\u1eb7c \u0111\u1ed5i c\u1ef1c c\u1ee7a nam ch\u00e2m th\u00ec l\u1ef1c \u0111i\u1ec7n t\u1eeb c\u00f3 chi\u1ec1u ng\u01b0\u1ee3c l\u1ea1i.","B. L\u1ef1c \u0111i\u1ec7n t\u1eeb c\u00f3 chi\u1ec1u \u0111i t\u1eeb trong l\u00f2ng nam ch\u00e2m ra ngo\u00e0i. N\u1ebfu \u0111\u1ed5i chi\u1ec1u d\u00f2ng \u0111i\u1ec7n ho\u1eb7c \u0111\u1ed5i c\u1ef1c c\u1ee7a nam ch\u00e2m th\u00ec l\u1ef1c \u0111i\u1ec7n t\u1eeb c\u00f3 chi\u1ec1u ng\u01b0\u1ee3c l\u1ea1i.","C. L\u1ef1c \u0111i\u1ec7n t\u1eeb c\u00f3 chi\u1ec1u \u0111i t\u1eeb ngo\u00e0i v\u00e0o trong l\u00f2ng nam ch\u00e2m. N\u1ebfu \u0111\u1ed5i chi\u1ec1u d\u00f2ng \u0111i\u1ec7n ho\u1eb7c \u0111\u1ed5i c\u1ef1c c\u1ee7a nam ch\u00e2m th\u00ec l\u1ef1c \u0111i\u1ec7n t\u1eeb c\u00f3 chi\u1ec1u nh\u01b0 c\u0169.","D. L\u1ef1c \u0111i\u1ec7n t\u1eeb c\u00f3 chi\u1ec1u \u0111i t\u1eeb trong l\u00f2ng nam ch\u00e2m ra ngo\u00e0i. N\u1ebfu \u0111\u1ed5i chi\u1ec1u d\u00f2ng \u0111i\u1ec7n ho\u1eb7c \u0111\u1ed5i c\u1ef1c c\u1ee7a nam ch\u00e2m th\u00ec l\u1ef1c \u0111i\u1ec7n t\u1eeb c\u00f3 chi\u1ec1u nh\u01b0 c\u0169."],"hint":"","explain":"<span class='basic_left'>\u00c1p d\u1ee5ng quy t\u1eafc b\u00e0n tay tr\u00e1i. Ta c\u00f3 t\u1eeb tr\u01b0\u1eddng h\u01b0\u1edbng t\u1eeb N sang S. D\u00f2ng \u0111i\u1ec7n \u0111i t\u1eeb d\u01b0\u1edbi l\u00ean tr\u00ean, n\u00ean l\u1ef1c t\u1eeb c\u00f3 ph\u01b0\u01a1ng n\u1eb1m ngang, h\u01b0\u1edbng t\u1eeb tr\u01b0\u1edbc ra sau. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3188},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai27/lv2/img\/h17.jpg'\/><\/center>X\u00e1c \u0111\u1ecbnh chi\u1ec1u \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb c\u1ee7a nam ch\u00e2m tr\u00ean h\u00ecnh 27.4.","select":["A. \u0110\u01b0\u1eddng s\u1ee9c t\u1eeb c\u1ee7a nam ch\u00e2m c\u00f3 chi\u1ec1u \u0111i t\u1eeb d\u01b0\u1edbi l\u00ean tr\u00ean.","B. \u0110\u01b0\u1eddng s\u1ee9c t\u1eeb c\u1ee7a nam ch\u00e2m c\u00f3 chi\u1ec1u \u0111i t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi.","C. \u0110\u01b0\u1eddng s\u1ee9c t\u1eeb c\u1ee7a nam ch\u00e2m c\u00f3 chi\u1ec1u \u0111i t\u1eeb trong ra ngo\u00e0i.","D. \u0110\u01b0\u1eddng s\u1ee9c t\u1eeb c\u1ee7a nam ch\u00e2m c\u00f3 chi\u1ec1u \u0111i t\u1eeb ngo\u00e0i v\u00e0o trong."],"hint":"","explain":"<span class='basic_left'>\u00c1p d\u1ee5ng quy t\u1eafc b\u00e0n tay tr\u00e1i. D\u00f2ng \u0111i\u1ec7n \u0111i t\u1eeb tr\u00e1i sang ph\u1ea3i, l\u1ef1c t\u1eeb c\u00f3 ph\u01b0\u01a1ng n\u1eb1m ngang, h\u01b0\u1edbng t\u1eeb sau ra tr\u01b0\u1edbc. N\u00ean t\u1eeb tr\u01b0\u1eddng h\u01b0\u1edbng t\u1eeb d\u01b0\u1edbi l\u00ean tr\u00ean.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3189},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"M\u1ed9t d\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng, kh\u00f4ng song song v\u1edbi \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb th\u00ec:","select":["A. Ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n.","B. Ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c t\u1eeb.","C. Ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb.","D. Ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111\u00e0n h\u1ed3i."],"hint":"","explain":"<span class='basic_left'>M\u1ed9t d\u00e2y d\u1eabn c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng, kh\u00f4ng song song v\u1edbi \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb th\u00ec ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c \u0111i\u1ec7n t\u1eeb. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3190}],"lesson":{"save":0,"level":2}}