{"segment":[{"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 nh\u00f3m h\u1ecdc sinh \u0111\u1ea9y m\u1ed9t xe ch\u1edf \u0111\u1ea5t \u0111i t\u1eeb A \u0111\u1ebfn B tr\u00ean m\u1ed9t \u0111o\u1ea1n \u0111\u01b0\u1eddng b\u1eb1ng ph\u1eb3ng n\u1eb1m ngang. \u0110\u1ebfn B \u0111\u1ed1 h\u1ebft \u0111\u1ea5t tr\u00ean xe xu\u1ed1ng r\u1ed3i l\u1ea1i \u0111\u1ea9y xe kh\u00f4ng \u0111i theo \u0111\u01b0\u1eddng c\u0169 v\u1ec1 A. So s\u00e1nh c\u00f4ng sinh ra \u1edf l\u01b0\u1ee3t \u0111i v\u00e0 l\u01b0\u1ee3t v\u1ec1. C\u00e2u tr\u1ea3 l\u1eddi n\u00e0o d\u01b0\u1edbi \u0111\u00e2y \u0111\u00fang?","select":["A. C\u00f4ng \u1edf l\u01b0\u1ee3t \u0111i b\u1eb1ng c\u00f4ng \u1edf l\u01b0\u1ee3t v\u1ec1 v\u00ec qu\u00e3ng \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c nh\u01b0 nhau.","B. C\u00f4ng \u1edf l\u01b0\u1ee3t \u0111i l\u1edbn h\u01a1n v\u00ec l\u1ef1c \u0111\u1ea9y \u1edf l\u01b0\u1ee3t \u0111i l\u1edbn h\u01a1n l\u1ef1c \u0111\u1ea9y \u1edf l\u01b0\u1ee3t v\u1ec1.","C. C\u00f4ng \u1edf l\u01b0\u1ee3t v\u1ec1 l\u1edbn h\u01a1n v\u00ec xe kh\u00f4ng th\u00ec \u0111i nhanh h\u01a1n.","D. C\u00f4ng \u1edf l\u01b0\u1ee3t \u0111i nh\u1ecf h\u01a1n v\u00ec \u0111\u1ea9y xe n\u1eb7ng th\u00ec \u0111i ch\u1eadm h\u01a1n."],"hint":"","explain":"<span class='basic_left'>C\u00f4ng \u1edf l\u01b0\u1ee3t \u0111i l\u1edbn h\u01a1n v\u00ec l\u1ef1c \u0111\u1ea9y \u1edf l\u01b0\u1ee3t \u0111i l\u1edbn h\u01a1n l\u1ef1c \u0111\u1ea9y \u1edf l\u01b0\u1ee3t v\u1ec1.Ta bi\u1ebft A= F x s m\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng trong hai tr\u01b0\u1eddng h\u1ee3p l\u00e0 nh\u01b0 nhau m\u00e0 l\u00fac \u0111i do xe ch\u1edf \u0111\u1ea5t n\u00ean c\u1ea7n t\u00e1c d\u1ee5ng l\u1ef1c l\u1edbn h\u01a1n l\u00fac v\u1ec1 n\u00ean c\u00f4ng trong tr\u01b0\u1eddng h\u1ee3p \u0111i l\u1edbn h\u01a1n l\u00fac v\u1ec1.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2680},{"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":"Ng\u01b0\u1eddi ta d\u00f9ng m\u1ed9t c\u1ea7n c\u1ea9u \u0111\u1ec3 n\u00e2ng m\u1ed9t th\u00f9ng h\u00e0ng c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 2500kg l\u00ean \u0111\u1ed9 cao 12m. T\u00ednh c\u00f4ng th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y","select":["A. 300kJ.","B. 250kJ.","C. 2,08kJ.","D. 300J."],"hint":"","explain":"<span class='basic_left'>Th\u00f9ng h\u00e0ng c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng l\u00e0 2500kg ngh\u0129a l\u00e0 n\u00f3 c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng P = 25000N.<br\/>C\u00f4ng th\u1ef1c hi\u1ec7n khi n\u00e2ng th\u00f9ng h\u00e0ng l\u00ean \u0111\u1ed9 cao 12m l\u00e0:<br\/>A = F x s= 25000N x 12m = 300000J = 300kJ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2681},{"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":"Tr\u01b0\u1eddng h\u1ee3p n\u00e0o sau \u0111\u00e2y kh\u00f4ng c\u00f3 c\u00f4ng c\u01a1 h\u1ecdc?","select":["A. Ng\u01b0\u1eddi h\u1ecdc sinh \u0111ang c\u1ed1 s\u1ee9c \u0111\u1ea9y h\u00f2n \u0111\u00e1 nh\u01b0ng kh\u00f4ng \u0111\u1ea9y n\u1ed5i.","B. Ng\u01b0\u1eddi c\u00f4ng nh\u00e2n \u0111ang d\u00f9ng r\u00f2ng r\u1ecdc k\u00e9o m\u1ed9t v\u1eadt l\u00ean cao.","C. Ng\u01b0\u1eddi c\u00f4ng nh\u00e2n \u0111ang \u0111\u1ea9y xe g\u00f2ong l\u00e0m xe chuy\u1ec3n \u0111\u1ed9ng.","D. Ng\u01b0\u1eddi l\u1ef1c s\u0129 \u0111ang n\u00e2ng qu\u1ea3 t\u1ea1 t\u1eeb th\u1ea5p l\u00ean cao."],"hint":"","explain":"<span class='basic_left'>C\u00f4ng c\u01a1 h\u1ecdc xu\u1ea5t hi\u1ec7n khi c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng v\u00e0 l\u00e0m v\u1eadt chuy\u1ec3n d\u1eddi m\u00e0 \u1edf tr\u01b0\u1eddng h\u1ee3p A h\u00f2n \u0111\u00e1 kh\u00f4ng chuy\u1ec3n d\u1eddi n\u00ean kh\u00f4ng c\u00f3 c\u00f4ng c\u01a1 h\u1ecdc<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2682},{"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":"M\u1ed9t \u0111\u1ea7u m\u00e1y xe l\u1eeda k\u00e9o c\u00e1c toa xe b\u1eb1ng l\u1ef1c F = 7500N. C\u00f4ng c\u1ee7a l\u1ef1c k\u00e9o l\u00e0 bao nhi\u00eau khi c\u00e1c toa xe chuy\u1ec3n \u0111\u1ed9ng \u0111\u01b0\u1ee3c qu\u00e3ng \u0111\u01b0\u1eddng s = 8km.","select":["A. A = 60000kJ.","B. A = 6000kJ.","C. A = 600kJ.","D. M\u1ed9t k\u1ebft qu\u1ea3 kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ed5i 8km= 8000m<br\/>C\u00f4ng c\u1ee7a l\u1ef1c k\u00e9o l\u00e0: <br\/>A = F x s = 7500 x 8000 = 6 x ${{10}^{7}}$ J = 60000 kJ<br\/> N\u00ean ch\u1ecdn A 60000kJ.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2683},{"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 \u0111\u01a1n v\u1ecb sau \u0111\u00e2y, \u0111\u01a1n v\u1ecb n\u00e0o l\u00e0 \u0111\u01a1n v\u1ecb c\u1ee7a c\u00f4ng c\u01a1 h\u1ecdc?","select":["A. N.m.","B. N.${{m}_{2}}$","C. N\/m.","D. N\/${{m}_{2}}$."],"hint":"","explain":"<span class='basic_left'>Bi\u1ec3u th\u1ee9c t\u00ednh c\u00f4ng c\u01a1 h\u1ecdc A = F.s m\u00e0 F c\u00f3 \u0111\u01a1n v\u1ecb l\u00e0 N, s \u0111\u01a1n v\u1ecb l\u00e0 m. N\u00ean A c\u00f3 \u0111\u01a1n v\u1ecb l\u00e0 N.m<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2684},{"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":"Ph\u00e1t bi\u1ec3u n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0 \u0111\u00fang? ","select":["A. Jun l\u00e0 c\u00f4ng c\u1ee7a m\u1ed9t l\u1ef1c l\u00e0m v\u1eadt chuy\u1ec3n d\u1ecbch \u0111\u01b0\u1ee3c 1m.","B. Jun l\u00e0 c\u00f4ng c\u1ee7a l\u1ef1c l\u00e0m d\u1ecbch chuy\u1ec3n m\u1ed9t v\u1eadt c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng l\u00e0 1 kg m\u1ed9t \u0111o\u1ea1n \u0111\u01b0\u1eddng 1 m.","C. Jun l\u00e0 c\u00f4ng c\u1ee7a l\u1ef1c 1 N l\u00e0m d\u1ecbch chuy\u1ec3n m\u1ed9t v\u1eadt m\u1ed9t \u0111o\u1ea1n 1 m.","D. Jun l\u00e0 c\u00f4ng c\u1ee7a l\u1ef1c 1 N l\u00e0m d\u1ecbch chuy\u1ec3n v\u1eadt m\u1ed9t \u0111o\u1ea1n 1 m theo ph\u01b0\u01a1ng c\u1ee7a l\u1ef1c."],"hint":"","explain":"<span class='basic_left'>Jun l\u00e0 c\u00f4ng c\u1ee7a l\u1ef1c 1 N l\u00e0m d\u1ecbch chuy\u1ec3n v\u1eadt m\u1ed9t \u0111o\u1ea1n 1 m theo ph\u01b0\u01a1ng c\u1ee7a l\u1ef1c. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2685},{"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":"T\u00ednh c\u00f4ng c\u1ee7a l\u1ef1c n\u00e2ng m\u1ed9t b\u00faa m\u00e1y c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng l\u00e0 20 t\u1ea5n l\u00ean cao 120cm? ","select":["A. 120000J.","B. 250000J.","C. 200000J.","D. 240000J."],"hint":"","explain":"<span class='basic_left'>C\u00f4ng c\u1ee7a l\u1ef1c n\u00e2ng m\u1ed9t b\u00faa m\u00e1y l\u00e0: <br\/>$A=P\\times h=20000\\times 10\\times 1,2=240000J$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2686},{"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 \u0111\u1ea7u t\u00e0u k\u00e9o m\u1ed9t \u0111o\u00e0n t\u00e0u chuy\u1ec3n \u0111\u1ed9ng t\u1eeb ga A t\u1edbi ga B trong 15 ph\u00fat v\u1edbi v\u1eadn t\u1ed1c 30km\/h. T\u1ea1i ga B \u0111o\u00e0n t\u00e0u \u0111\u01b0\u1ee3c m\u1eafc th\u00eam toa v\u00e0 do \u0111\u00f3 chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u t\u1eeb ga B \u0111\u1ebfn C v\u1edbi v\u1eadn t\u1ed1c nh\u1ecf h\u01a1n tr\u01b0\u1edbc 10km\/h. Th\u1eddi gian \u0111i t\u1eeb ga B \u0111\u1ebfn ga C l\u00e0 30 ph\u00fat. T\u00ednh c\u00f4ng c\u1ee7a \u0111\u1ea7u t\u00e0u \u0111\u00e3 sinh ra bi\u1ebft r\u1eb1ng l\u1ef1c k\u00e9o c\u1ee7a \u0111\u1ea7u t\u00e0u kh\u00f4ng \u0111\u1ed5i l\u00e0 40 000N.","select":["A. 600 000 000J.","B. 700 000 000J.","C. 800 000 000J.","D. 900 000 000J."],"hint":"","explain":"<span class='basic_left'>${{S}_{1}}={{v}_{1}}\\times {{t}_{1}}=30\\times \\dfrac{1}{4}=7,5km$<br\/>${{S}_{2}}={{v}_{2}}\\times {{t}_{2}}=20\\times \\dfrac{1}{2}=10km$<br\/>S = ${{S}_{1}}$ + ${{S}_{1}}$ = 17,5 km = 17 500 m <br\/>A = F.S = 40 000.17 500 = 700 000 000 J<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2687},{"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 v\u1eadn \u0111\u1ed9ng vi\u00ean nh\u1ea3y cao \u0111\u1ea1t \u0111\u01b0\u1ee3c th\u00e0nh t\u00edch l\u00e0 2,1m. Gi\u1ea3 s\u1eed v\u1eadn \u0111\u1ed9ng vi\u00ean \u0111\u00f3 l\u00e0 nh\u00e0 du h\u00e0nh v\u0169 tr\u1ee5 l\u00ean M\u1eb7t Tr\u0103ng th\u00ec tr\u00ean M\u1eb7t Tr\u0103ng ng\u01b0\u1eddi \u1ea5y nh\u1ea3y cao \u0111\u01b0\u1ee3c bao nhi\u00eau m\u00e9t ? Bi\u1ebft r\u1eb1ng l\u1ef1c h\u00fat c\u1ee7a Tr\u00e1i \u0110\u1ea5t l\u00ean v\u1eadt \u1edf m\u1eb7t \u0111\u1ea5t l\u1edbn h\u01a1n l\u1ef1c h\u00fat c\u1ee7a M\u1eb7t Tr\u0103ng l\u00ean v\u1eadt \u1ea5y \u1edf tr\u00ean M\u1eb7t Tr\u0103ng 6 l\u1ea7n v\u00e0 \u1edf tr\u00ean M\u1eb7t Tr\u0103ng ng\u01b0\u1eddi \u1ea5y ph\u1ea3i m\u1eb7c th\u00eam b\u1ed9 \u00e1o gi\u00e1p v\u0169 tr\u1ee5 n\u1eb7ng b\u1eb1ng $\\dfrac{6}{5}$ th\u00e2n th\u1ec3 ng\u01b0\u1eddi \u0111\u00f3. C\u00f4ng c\u1ee7a c\u01a1 b\u1eafp sinh ra trong m\u1ed7i l\u1ea7n nh\u1ea3y coi l\u00e0 nh\u01b0 nhau.","select":["A. 5,6m.","B. 5,7m.","C. 5,8m.","D. 5,9m."],"hint":"","explain":"<span class='basic_left'>G\u1ecdi tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a ng\u01b0\u1eddi \u0111\u00f3 \u1edf tr\u00ean Tr\u00e1i \u0110\u1ea5t l\u00e0 P. Tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a ng\u01b0\u1eddi \u0111\u00f3 v\u00e0 b\u1ed9 \u00e1o gi\u00e1p tr\u00ean M\u1eb7t Tr\u0103ng l\u00e0: <br\/> ${{P}_{1}}=\\dfrac{P}{6}+\\dfrac{P}{5}=\\dfrac{11}{30}P$<br\/>Khi nh\u00e0 du h\u00e0nh V\u0169 tr\u1ee5 nh\u1ea3y tr\u00ean m\u1eb7t \u0111\u1ea5t: A = P.h (1)<br\/> Khi nh\u00e0 du h\u00e0nh V\u0169 tr\u1ee5 nh\u1ea3y tr\u00ean M\u1eb7t Tr\u0103ng:<br\/>$A={{P}_{1}}\\times {{h}_{1}}=\\dfrac{11}{30}P\\times {{h}_{1}}$ (2) <br\/>T\u1eeb (1) v\u00e0 (2) ta c\u00f3:<br\/> $h_1$=$\\dfrac{30}{11}$h \u22485,7m<br\/><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2688},{"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":"T\u00ednh c\u00f4ng c\u01a1 h\u1ecdc c\u1ee7a m\u1ed9t ng\u01b0\u1eddi n\u1eb7ng 50kg th\u1ef1c hi\u1ec7n khi \u0111i \u0111\u1ec1u tr\u00ean m\u1ed9t \u0111o\u1ea1n \u0111\u01b0\u1eddng n\u1eb1m ngang 1km. Bi\u1ebft r\u1eb1ng, c\u00f4ng c\u1ee7a m\u1ed9t ng\u01b0\u1eddi khi \u0111i \u0111\u1ec1u tr\u00ean \u0111\u01b0\u1eddng n\u1eb1m ngang th\u00ec b\u1eb1ng 0,05 l\u1ea7n c\u00f4ng c\u1ee7a l\u1ef1c n\u00e2ng ng\u01b0\u1eddi \u0111\u00f3 l\u00ean \u0111\u1ed9 cao b\u1eb1ng \u0111o\u1ea1n \u0111\u01b0\u1eddng \u0111\u00f3.","select":["A. 21000J.","B. 22000J.","C. 24000J.","D. 25000J."],"hint":"","explain":"<span class='basic_left'>m = 50kg, s = 1km<br\/>\u0110\u1ec1 b\u00e0i: A = 0,05Ap m\u00e0 Ap = p x h = 10m x h = 50 x 10 x 1000 = 500 000J<br\/>Do \u0111\u00f3: A = 0,05Ap = 25000J<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2689},{"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 v\u1eadt tr\u1ecdng l\u01b0\u1ee3ng 2N tr\u01b0\u1ee3t tr\u00ean m\u1eb7t b\u00e0n n\u1eb1m ngang \u0111\u01b0\u1ee3c 0,5m. C\u00f4ng c\u1ee7a tr\u1ecdng l\u1ef1c l\u00e0: ","select":["A. 1J.","B. 0J.","C. 2J.","D. 0,5J."],"hint":"","explain":"<span class='basic_left'>V\u00ec tr\u1ecdng l\u1ef1c c\u00f3 ph\u01b0\u01a1ng vu\u00f4ng g\u00f3c v\u1edbi ph\u01b0\u01a1ng n\u1eb1m ngang n\u00ean n\u00f3 kh\u00f4ng sinh c\u00f4ng trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2690},{"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":"Tr\u01b0\u1eddng h\u1ee3p n\u00e0o d\u01b0\u1edbi \u0111\u00e2y c\u00f3 c\u00f4ng c\u01a1 h\u1ecdc? ","select":["A. M\u1ed9t qu\u1ea3 b\u01b0\u1edfi r\u01a1i t\u1eeb c\u00e0nh c\u00e2y xu\u1ed1ng.","B. M\u1ed9t l\u1ef1c s\u0129 c\u1eed t\u1ea1 \u0111ang \u0111\u1ee9ng y\u00ean \u1edf t\u01b0 th\u1ebf \u0111\u1ee1 qu\u1ea3 t\u1ea1.","C. M\u1ed9t v\u1eadt sau khi tr\u01b0\u1ee3t xu\u1ed1ng h\u1ebft m\u1ed9t m\u1eb7t ph\u1eb3ng nghi\u00eang, tr\u01b0\u1ee3t \u0111\u1ec1u tr\u00ean m\u1eb7t b\u00e0n nh\u1eb5n n\u00e0m ngang coi nh\u01b0 kh\u00f4ng c\u00f3 ma s\u00e1t.","D. H\u00e0nh kh\u00e1ch \u0111ang ra s\u1ee9c \u0111\u1ea9y m\u1ed9t xe kh\u00e1ch b\u1ecb ch\u1ebft m\u00e1y, nh\u01b0ng xe v\u1eabn kh\u00f4ng chuy\u1ec3n \u0111\u1ed9ng \u0111\u01b0\u1ee3c."],"hint":"","explain":"<span class='basic_left'>Tr\u1ecdng l\u1ef1c th\u1ef1c hi\u1ec7n c\u00f4ng k\u00e9o qu\u1ea3 b\u01b0\u1edfi xu\u1ed1ng \u0111\u1ea5t. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2691},{"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":"Ng\u01b0\u1eddi ta d\u00f9ng m\u1ed9t c\u1ea7n c\u1ea9u \u0111\u1ec3 n\u00e2ng m\u1ed9t th\u00f9ng h\u00e0ng kh\u1ed1i l\u01b0\u1ee3ng 2500kg l\u00ean \u0111\u1ed9 cao 12m. T\u00ednh c\u00f4ng th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y.","select":["A. 200 KJ.","B. 250 KJ.","C. 300 KJ.","D. 350 KJ."],"hint":"","explain":"<span class='basic_left'>Th\u00f9ng h\u00e0ng c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng l\u00e0 2500kg ngh\u0129a l\u00e0 n\u00f3 c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng 25000N.<br\/>C\u00f4ng th\u1ef1c hi\u1ec7n khi n\u00e2ng th\u00f9ng h\u00e0ng l\u00ean \u0111\u1ed9 cao 12m l\u00e0:<br\/> A = 25000N \u00d7 12m = 300000J = 300kJ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2692},{"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":"Tr\u01b0\u1eddng h\u1ee3p n\u00e0o sau \u0111\u00e2y kh\u00f4ng sinh c\u00f4ng?","select":["A. Con ng\u1ef1a k\u00e9o xe.","B. M\u1ed9t ng\u01b0\u1eddi \u0111i b\u1ed9.","C. Th\u00f9ng h\u00e0ng n\u1eb1m im.","D. M\u1ed9t v\u1eadt r\u01a1i t\u1eeb tr\u00ean cao xu\u1ed1ng."],"hint":"","explain":"<span class='basic_left'>Th\u00f9ng h\u00e0ng n\u1eb1m im kh\u00f4ng di chuy\u1ec3n n\u00ean kh\u00f4ng c\u00f3 l\u1ef1c sinh c\u00f4ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2693},{"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 con ng\u1ef1a k\u00e9o xe chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u v\u1edbi l\u1ef1c k\u00e9o l\u00e0 600N. Trong 5 ph\u00fat c\u00f4ng th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c l\u00e0 360kJ. T\u00ednh v\u1eadn t\u1ed1c chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a xe.","select":["A. 1 m\/s.","B. 2 m\/s.","C. 3 m\/s.","D. 4 m\/s."],"hint":"","explain":"<span class='basic_left'>C\u00f4ng su\u1ea5t c\u1ee7a xe l\u00e0: $\\dfrac{360000}{5\\times 60}=1200(W)$<br\/>V\u1eadn t\u1ed1c c\u1ee7a xe l\u00e0: $v=\\dfrac{P}{F}=\\dfrac{1200}{600}=2m\/s$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2694},{"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":"Khi n\u00e0o c\u00f3 c\u00f4ng c\u01a1 h\u1ecdc?","select":["A. M\u1ed9t v\u1eadt lu\u00f4n c\u00f3 c\u00f4ng c\u01a1 h\u1ecdc.","B. M\u1ed9t v\u1eadt c\u00f3 c\u00f4ng c\u01a1 h\u1ecdc ch\u1ec9 c\u1ea7n c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng.","C. M\u1ed9t v\u1eadt c\u00f3 c\u00f4ng c\u01a1 h\u1ecdc khi c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng l\u00e0m v\u1eadt chuy\u1ec3n r\u1eddi.","D. M\u1ed9t v\u1eadt c\u00f3 c\u00f4ng c\u01a1 h\u1ecdc khi n\u1eb1m im."],"hint":"","explain":"<span class='basic_left'>M\u1ed9t v\u1eadt c\u00f3 c\u00f4ng c\u01a1 h\u1ecdc khi c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng l\u00e0m v\u1eadt chuy\u1ec3n r\u1eddi.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2695},{"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":"C\u00f4ng c\u01a1 h\u1ecdc ph\u1ee5 thu\u1ed9c nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0o?","select":["A. Ch\u1ec9 ph\u1ee5 thu\u1ed9c l\u1ef1c t\u00e1c d\u1ee5ng.","B. Ch\u1ec9 ph\u1ee5 thu\u1ed9c v\u00e0o qu\u00e3ng \u0111\u01b0\u1eddng d\u1ecbch chuy\u1ec3n.","C. Ph\u1ee5 thu\u1ed9c v\u00e0o c\u1ea3 l\u1ef1c t\u00e1c d\u1ee5ng v\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng d\u1ecbch chuy\u1ec3n.","D. Kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o y\u1ebfu t\u1ed1 n\u00e0o trong 2 y\u1ebfu t\u1ed1 tr\u00ean."],"hint":"","explain":"<span class='basic_left'>C\u00f4ng c\u01a1 h\u1ecdc ph\u1ee5 thu\u1ed9c v\u00e0o c\u1ea3 l\u1ef1c t\u00e1c d\u1ee5ng v\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng d\u1ecbch chuy\u1ec3n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2696},{"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":"C\u00f4ng th\u1ee9c t\u00ednh c\u00f4ng c\u01a1 h\u1ecdc l\u00e0:","select":["A. A=F.s","B. A= $\\dfrac{F}{s}$","C. A= F.a","D. A= $\\dfrac{s}{F}$"],"hint":"","explain":"<span class='basic_left'>C\u00f4ng th\u1ee9c t\u00ednh c\u00f4ng c\u01a1 h\u1ecdc l\u00e0: A=F.s<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2697},{"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":"Tr\u01b0\u1eddng h\u1ee3p n\u00e0o sau \u0111\u00e2y c\u00f3 c\u00f4ng c\u01a1 h\u1ecdc?","select":["A. Ng\u01b0\u1eddi \u0111ang k\u00e9o g\u1ea7u n\u01b0\u1edbc t\u1eeb d\u01b0\u1edbi gi\u1ebfng l\u00ean.","B. M\u1ed9t th\u00f9ng h\u00e0ng \u0111\u1ee9ng y\u00ean.","C. M\u1ed9t v\u1eadt tr\u01b0\u1ee3t \u0111\u1ec1u tr\u00ean m\u1eb7t ph\u1eb3ng ngang, coi nh\u01b0 kh\u00f4ng c\u00f3 ma s\u00e1t.","D. M\u1ed9t ng\u01b0\u1eddi \u0111\u1ea9y m\u1ed9t c\u00e1i xe nh\u01b0ng c\u00e1i xe v\u1eabn kh\u00f4ng chuy\u1ec3n \u0111\u1ed9ng."],"hint":"","explain":"<span class='basic_left'>Ng\u01b0\u1eddi \u0111ang k\u00e9o g\u1ea7u n\u01b0\u1edbc t\u1eeb d\u01b0\u1edbi gi\u1ebfng l\u00ean th\u00ec l\u1ef1c k\u00e9o c\u1ee7a ng\u01b0\u1eddi sinh c\u00f4ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2698},{"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":"T\u00ednh c\u00f4ng c\u1ee7a qu\u1ea3 b\u01b0\u1edfi n\u1eb7ng 1kg r\u01a1i t\u1eeb c\u00e0nh cao 4m xu\u1ed1ng \u0111\u1ea5t.","select":["A. 4 Nm.","B. 0,25 Nm.","C. 40 Nm.","D. 10 Nm."],"hint":"","explain":"<span class='basic_left'>P = 10.m = 10.1 =10N <br\/>A = F.s = P.h = 10.4 = 40 Nm. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2699}],"lesson":{"save":0,"level":2}}