{"segment":[{"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 nhi\u1ec7t dung ri\u00eang c\u1ee7a m\u1ed9t kim lo\u1ea1i, bi\u1ebft r\u1eb1ng ph\u1ea3i cung c\u1ea5p cho 5kg kim lo\u1ea1i n\u00e0y \u1edf nhi\u1ec7t \u0111\u1ed9 $20{}^\\circ C$ m\u1ed9t nhi\u1ec7t l\u01b0\u1ee3ng kho\u1ea3ng 59kJ \u0111\u1ec3 n\u00f3 n\u00f3ng l\u00ean \u0111\u1ebfn $50{}^\\circ C$. Kim lo\u1ea1i \u0111\u00f3 t\u00ean l\u00e0 g\u00ec?","select":["A. C = 462J\/kg.K. Kim lo\u1ea1i \u0111\u00f3 l\u00e0 Th\u00e9p.","B. C = 880J\/kg.K. Kim lo\u1ea1i \u0111\u00f3 l\u00e0 Nh\u00f4m.","C. C = 392J\/kg.K. Kim lo\u1ea1i \u0111\u00f3 l\u00e0 \u0110\u1ed3ng .","D. C = 134J\/kg.K. Kim lo\u1ea1i \u0111\u00f3 l\u00e0 Ch\u00ec"],"hint":"","explain":"<span class='basic_left'>\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c:<br\/> $Q=m\\times C\\times \\Delta t$ <br\/>Suy ra : Nhi\u1ec7t dung ri\u00eang c\u1ee7a m\u1ed9t kim lo\u1ea1i l\u00e0: <br\/>$C=\\dfrac{Q}{m\\times \\Delta t}=\\dfrac{59000}{5\\times (50-20)}=393$J\/Kg.K<br\/>Tra b\u1ea3ng ta bi\u1ebft kim lo\u1ea1i n\u00e0y l\u00e0 \u0111\u1ed3ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2920},{"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 \u1ea5m \u0111un n\u01b0\u1edbc b\u1eb1ng nh\u00f4m kh\u1ed1i l\u01b0\u1ee3ng 0,5kg ch\u1ee9a 2kg n\u01b0\u1edbc \u1edf nhi\u1ec7t \u0111\u1ed9 $25{}^\\circ C$. Mu\u1ed1n \u0111un s\u00f4i \u1ea5m n\u01b0\u1edbc n\u00e0y c\u1ea7n nhi\u1ec7t l\u01b0\u1ee3ng bao nhi\u00eau?","select":["A. 763.000 (J).","B. 563.000 (J).","C. 463.000 (J).","D. 663.000 (J)."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n truy\u1ec1n nh\u00f4m n\u00f3ng l\u00ean $75{}^\\circ C$<br\/>${{Q}_{1}}={{m}_{1}}\\times {{C}_{1}}\\times \\Delta t=0,5\\times 880\\times 75=33.000$(J).<br\/>Nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n truy\u1ec1n n\u01b0\u1edbc n\u00f3ng l\u00ean $75{}^\\circ C$<br\/>${{Q}_{2}}={{m}_{2}}\\times {{C}_{2}}\\times \\Delta t=2\\times 4200\\times 75=630.000$(J).<br\/>Nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n truy\u1ec1n \u1ea5m n\u01b0\u1edbc n\u00f3ng l\u00ean $75{}^\\circ C$<br\/>$Q={{Q}_{1}}+{{Q}_{2}}=33.000+630.000=663.000$(J).<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2921},{"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":"\u0110on v\u1ecb n\u00e0o kh\u00f4ng ph\u1ea3i l\u00e0 \u0111\u01a1n v\u1ecb c\u1ee7a nhi\u1ec7t l\u01b0\u1ee3ng?","select":["A. J.","B. KJ.","C. Calo.","D. N\/m."],"hint":"","explain":"<span class='basic_left'>\u0110\u00e2y l\u00e0 \u0111\u01a1n v\u1ecb c\u1ee7a \u0111\u1ed9 c\u1ee9ng K. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2922},{"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 nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n truy\u1ec1n cho 5 kg \u0111\u1ed3ng \u0111\u1ec3 t\u0103ng nhi\u1ec7t \u0111\u1ed9 t\u1eeb $20{}^\\circ C$l\u00ean $50{}^\\circ C$. ","select":["A. Q=54000 (J)","B. Q=55000 (J)","C. Q=56000 (J)","D. Q=57000 (J)"],"hint":"","explain":"<span class='basic_left'>\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c $Q=m\\times C\\times \\Delta t$ <br\/>Thay s\u1ed1 ta c\u00f3: $Q=5\\times 380\\times (50-20)=57000$ (J)<br\/>V\u1eady nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n truy\u1ec1n cho 5kg \u0111\u1ed3ng \u0111\u1ec3 t\u0103ng nhi\u1ec7t \u0111\u1ed9 t\u1eeb $20{}^\\circ C$l\u00ean $50{}^\\circ C$l\u00e0 Q=57000 (J)<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2923},{"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 \u1ea5m nh\u00f4m c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 350gam ch\u1ee9a 0,8l\u00edt n\u01b0\u1edbc. Cho nhi\u1ec7t dung ri\u00eang c\u1ee7a nh\u00f4m v\u00e0 c\u1ee7a n\u01b0\u1edbc l\u1ea7n l\u01b0\u1ee3t l\u00e0 ${{C}_{1}}=880J\/kg.K$;${{C}_{2}}=4200J\/kg.K$. Nhi\u1ec7t \u0111\u1ed9 ban \u0111\u1ea7u c\u1ee7a n\u01b0\u1edbc l\u00e0 $24{}^\\circ C$. Nhi\u1ec7t l\u01b0\u1ee3ng t\u1ed1i thi\u1ec3u c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111un s\u00f4i n\u01b0\u1edbc trong \u1ea5m c\u00f3 th\u1ec3 nh\u1eadn gi\u00e1 tr\u1ecb n\u00e0o trong c\u00e1c gi\u00e1 tr\u1ecb sau:","select":["A. Q = 27876,8 J.","B. Q = 278768 kJ.","C. Q = 278768 J.","D. Q = 27876,8 kJ."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n \u0111\u1ec3 \u0111un s\u00f4i l\u00e0:<br\/>$Q={{Q}_{1}}+{{Q}_{2}}={{m}_{1}}\\times {{c}_{1}}\\times {{\\Delta }_{1}}+{{m}_{2}}\\times {{c}_{2}}\\times {{\\Delta }_{2}}$ <br\/>Thay s\u1ed1: $Q=0,35\\times 880\\times (100-24)+0,84\\times 4200\\times (100-24)=278768J$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2924},{"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":"Nhi\u1ec7t n\u0103ng v\u1eadt \u0111\u01b0\u1ee3c nh\u1eadn hay t\u1ecfa ph\u1ee5 thu\u1ed9c v\u00e0o y\u1ebfu t\u1ed1 n\u00e0o?","select":["A. Kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a v\u1eadt.","B. Nhi\u1ec7t dung ri\u00eang c\u1ee7a ch\u1ea5t l\u00e0m v\u1eadt.","C. \u0110\u1ed9 t\u0103ng, gi\u1ea3m nhi\u1ec7t \u0111\u1ed9 c\u1ee7a v\u1eadt.","D. C\u1ea3 3 y\u1ebfu t\u1ed1 tr\u00ean."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t n\u0103ng v\u1eadt \u0111\u01b0\u1ee3c nh\u1eadn hay t\u1ecfa ph\u1ee5 thu\u1ed9c v\u00e0o kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a v\u1eadt, nhi\u1ec7t dung ri\u00eang c\u1ee7a ch\u1ea5t l\u00e0m v\u1eadt v\u00e0 \u0111\u1ed9 t\u0103ng nhi\u1ec7t \u0111\u1ed9 c\u1ee7a v\u1eadt.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2925},{"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":"Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang khi n\u00f3i v\u1ec1 nhi\u1ec7t dung ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t?","select":["A. Nhi\u1ec7t dung ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t cho bi\u1ebft nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n thi\u1ebft \u0111\u1ec3 l\u00e0m cho 1 \u0111\u01a1n v\u1ecb th\u1ec3 t\u00edch ch\u1ea5t \u0111\u00f3 t\u0103ng th\u00eam $1{}^\\circ C$.","B. Nhi\u1ec7t dung ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t cho bi\u1ebft nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n thi\u1ebft \u0111\u1ec3 l\u00e0m cho 1kg ch\u1ea5t \u0111\u00f3 t\u0103ng th\u00eam $1{}^\\circ C$.","C. Nhi\u1ec7t dung ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t cho bi\u1ebft nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n thi\u1ebft \u0111\u1ec3 l\u00e0m cho 1 g ch\u1ea5t \u0111\u00f3 t\u0103ng th\u00eam $1{}^\\circ C$.","D. Nhi\u1ec7t dung ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t cho bi\u1ebft n\u0103ng l\u01b0\u1ee3ng c\u1ea7n thi\u1ebft \u0111\u1ec3 l\u00e0m cho 1kg ch\u1ea5t \u0111\u00f3 t\u0103ng th\u00eam $1{}^\\circ C$."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t dung ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t cho bi\u1ebft nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n thi\u1ebft \u0111\u1ec3 l\u00e0m cho 1kg ch\u1ea5t \u0111\u00f3 t\u0103ng th\u00eam $1{}^\\circ C$.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2926},{"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":"\u0110\u01a1n v\u1ecb c\u1ee7a nhi\u1ec7t dung ri\u00eang c\u1ee7a v\u1eadt l\u00e0?","select":["A. $J\/kg$.","B. $kg\/J$.","C. $J\/kg.K$.","D. $kg\/J.K$."],"hint":"","explain":"<span class='basic_left'>\u0110\u01a1n v\u1ecb c\u1ee7a nhi\u1ec7t dung ri\u00eang c\u1ee7a v\u1eadt l\u00e0 $J\/kg.K$.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2927},{"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":"Nhi\u1ec7t dung ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 4200 , \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0:","select":["A. \u0110\u1ec3 1kg n\u01b0\u1edbc bay h\u01a1i ta ph\u1ea3i cung c\u1ea5p cho n\u00f3 nhi\u1ec7t l\u01b0\u1ee3ng l\u00e0 4200 J.","B. 1 kg n\u01b0\u1edbc khi bi\u1ebfn th\u00e0nh n\u01b0\u1edbc \u0111\u00e1 s\u1ebd gi\u1ea3i ph\u00f3ng nhi\u1ec7t l\u01b0\u1ee3ng l\u00e0 4200 J.","C. \u0110\u1ec3 n\u00e2ng 1 kg n\u01b0\u1edbc bay h\u01a1i ta ph\u1ea3i cung c\u1ea5p cho n\u00f3 nhi\u1ec7t l\u01b0\u1ee3ng l\u00e0 4200 J.","D. \u0110\u1ec3 n\u00e2ng 1 kg n\u01b0\u1edbc t\u0103ng l\u00ean 1 \u0111\u1ed9 ta c\u1ea7n cung c\u1ea5p cho n\u00f3 nhi\u1ec7t l\u01b0\u1ee3ng l\u00e0 4200 J."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t dung ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 4200 , \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 \u0111\u1ec3 n\u00e2ng 1 kg n\u01b0\u1edbc t\u0103ng l\u00ean 1 \u0111\u1ed9 ta c\u1ea7n cung c\u1ea5p cho n\u00f3 nhi\u1ec7t l\u01b0\u1ee3ng l\u00e0 4200 J.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2928},{"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 v\u1eadt l\u00e0m b\u1eb1ng kim lo\u1ea1i c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng m = 10kg khi h\u1ea5p th\u1ee5 m\u1ed9t nhi\u1ec7t l\u01b0\u1ee3ng 117kJ th\u00ec nhi\u1ec7t \u0111\u1ed9 c\u1ee7a v\u1eadt t\u0103ng l\u00ean th\u00eam $30{}^\\circ C$. V\u1eadt \u0111\u00f3 l\u00e0m b\u1eb1ng kim lo\u1ea1i g\u00ec?","select":["A. \u0110\u1ed3ng.","B. S\u1eaft.","C. Nh\u00f4m.","D. Ch\u00ec."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t dung ri\u00eang c\u1ee7a v\u1eadt l\u00e0: <br\/> $c=\\dfrac{Q}{m\\times {{\\Delta }_{t}}}=\\dfrac{117000}{10\\times 30}=390J.Kg\/K$ <br\/> Tra b\u1ea3ng ta c\u00f3 \u0111\u00f3 l\u00e0 \u0110\u1ed3ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2929},{"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\u00f3 4 b\u00ecnh A, B, C v\u00e0 D \u0111\u1ef1ng l\u1ea7n l\u01b0\u1ee3t 1 l\u00edt; 1,5l\u00edt; 2l\u00edt; 2,5l\u00edt n\u01b0\u1edbc \u1edf c\u00f9ng m\u1ed9t nhi\u1ec7t \u0111\u1ed9. Sau khi d\u00f9ng \u0111\u00e8n c\u1ed3n gi\u1ed1ng h\u1ec7t nhau \u0111\u1ec3 \u0111un c\u00e1c b\u00ecnh n\u00e0y trong c\u00f9ng m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u01b0 nhau, ng\u01b0\u1eddi ta th\u1ea5y nhi\u1ec7t \u0111\u1ed9 c\u1ee7a n\u01b0\u1edbc trong c\u00e1c b\u00ecnh tr\u1edf n\u00ean kh\u00e1c nhau. Y\u1ebfu t\u1ed1 n\u00e0o sau \u0111\u00e2y l\u00e0m nhi\u1ec7t \u0111\u1ed9 c\u1ee7a n\u01b0\u1edbc trong c\u00e1c b\u00ecnh tr\u1edf n\u00ean kh\u00e1c nhau?","select":["A. L\u01b0\u1ee3ng ch\u1ea5t l\u1ecfng ch\u1ee9a trong b\u00ecnh.","B. Lo\u1ea1i ch\u1ea5t l\u1ecfng ch\u1ee9a trong b\u00ecnh.","C. Th\u1eddi gian \u0111un.","D. Nhi\u1ec7t l\u01b0\u1ee3ng t\u1eebng b\u00ecnh nh\u1eadn \u0111\u01b0\u1ee3c."],"hint":"","explain":"<span class='basic_left'>L\u01b0\u1ee3ng ch\u1ea5t l\u1ecfng ch\u1ee9a trong b\u00ecnh l\u00e0m nhi\u1ec7t \u0111\u1ed9 c\u1ee7a n\u01b0\u1edbc trong c\u00e1c b\u00ecnh tr\u1edf n\u00ean kh\u00e1c nhau. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2930},{"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":"\u0110un n\u00f3ng 18l\u00edt n\u01b0\u1edbc t\u1eeb nhi\u1ec7t \u0111\u1ed9 ban \u0111\u1ea7u ${{t}_{1}}$ . Bi\u1ebft r\u1eb1ng nhi\u1ec7t \u0111\u1ed9 c\u1ee7a n\u01b0\u1edbc t\u0103ng l\u00ean \u0111\u1ebfn ${{t}_{2}}=60{}^\\circ C$ khi n\u00f3 h\u1ea5p th\u1ee5 m\u1ed9t nhi\u1ec7t l\u01b0\u1ee3ng l\u00e0 3820kJ. Cho nhi\u1ec7t dung ri\u00eang c\u1ee7a n\u01b0\u1edbc c = 4200J\/kg.K. H\u1ecfi nhi\u1ec7t \u0111\u1ed9 ban \u0111\u1ea7u c\u1ee7a n\u01b0\u1edbc c\u00f3 th\u1ec3 nh\u1eadn gi\u00e1 tr\u1ecb n\u00e0o trong c\u00e1c gi\u00e1 tr\u1ecb n\u00e0o sau:","select":["A. ${{t}_{1}}=9,5{}^\\circ C$.","B. ${{t}_{1}}=8,5{}^\\circ C$.","C. ${{t}_{1}}=7,5{}^\\circ C$.","D. M\u1ed9t gi\u00e1 tr\u1ecb kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c $Q=m\\times C\\times \\Delta t$ <br\/>Ta c\u00f3: $\\Delta t=\\dfrac{Q}{m\\times C}=\\dfrac{3820000}{18\\times 4200}=50,520{}^\\circ C$ <br\/>V\u1eady ${{t}_{1}}={{t}_{2}}-{{\\Delta }_{t}}=60-50,5=9,5{}^\\circ C$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2931},{"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":"Calo l\u00e0 nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n thi\u1ebft \u0111\u1ec3 l\u00e0m cho m\u1ed9t gam n\u01b0\u1edbc n\u00f3ng th\u00eam $1{}^\\circ C$. D\u1ef1a v\u00e0o \u0111\u1ecbnh ngh\u0129a n\u00e0y, h\u00e3y cho bi\u1ebft 1 calo b\u1eb1ng bao nhi\u00eau Jun v\u00e0 ng\u01b0\u1ee3c l\u1ea1i, 1Jun b\u1eb1ng bao nhi\u00eau calo?","select":["A. $1calo=4,2J$; $1J\\approx 2,4calo$.","B. $1calo=42J$; $1J\\approx 0,24calo$.","C. $1calo=4,2J$; $1J\\approx 24calo$.","D. $1calo=4,2J$; $1J\\approx 0,24calo$."],"hint":"","explain":"<span class='basic_left'>$1calo=4,2J$; $1J\\approx 0,24calo$.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2932},{"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":"\u0110\u1ea7u th\u00e9p c\u1ee7a m\u1ed9t b\u00faa m\u00e1y c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 12kg n\u00f3ng l\u00ean th\u00eam $20{}^\\circ C$ sau 1,5 ph\u00fat ho\u1ea1t \u0111\u1ed9ng. Bi\u1ebft r\u1eb1ng ch\u1ec9 c\u00f3 40% c\u01a1 n\u0103ng c\u1ee7a b\u00faa m\u00e1y chuy\u1ec3n th\u00e0nh nhi\u1ec7t n\u0103ng c\u1ee7a \u0111\u1ea7u b\u00faa. L\u1ea5y nhi\u1ec7t dung ri\u00eang c\u1ee7a th\u00e9p l\u00e0 460 . C\u00f4ng su\u1ea5t c\u1ee7a b\u00faa c\u00f3 th\u1ec3 nh\u1eadn gi\u00e1 tr\u1ecb n\u00e0o trong c\u00e1c gi\u00e1 tr\u1ecb sau:","select":["A. P = 306,667kW.","B. P = 306,667W.","C. P = 3066,67kW.","D. P = 3066,67W."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t b\u00faa sinh ra: $Q=12\\times 20\\times 460=110400J$ <br\/>C\u00f4ng su\u1ea5t c\u1ee7a b\u00faa: $P=\\dfrac{Q}{H\\times {{\\Delta }_{t}}}=\\dfrac{110400}{40%\\times 90}=3066,67W$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2933},{"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":"Nhi\u1ec7t l\u01b0\u1ee3ng m\u00e0 c\u01a1 th\u1ec3 ta h\u1ea5p th\u1ee5 khi u\u1ed1ng m\u1ed9t l\u01b0\u1ee3ng n\u01b0\u1edbc c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng n\u01b0\u1edbc l\u00e0 180 gam \u1edf nhi\u1ec7t \u0111\u1ed9 $54,6{}^\\circ C$ l\u00e0 bao nhi\u00eau? Cho nhi\u1ec7t \u0111\u1ed9 c\u01a1 th\u1ec3 ng\u01b0\u1eddi l\u00e0 $36,6{}^\\circ C$ v\u00e0 nhi\u1ec7t dung ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 c = 4200J\/kg.\u0111\u1ed9. Ch\u1ecdn k\u1ebft qu\u1ea3 \u0111\u00fang trong c\u00e1c k\u1ebft qu\u1ea3 sau:","select":["A. Q = 1512kJ.","B. Q = 151,2kJ.","C. Q = 15,12kJ.","D. M\u1ed9t k\u1ebft qu\u1ea3 kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng n\u01b0\u1edbc t\u1ecfa ra l\u00e0:<br\/>$Q=m\\times c\\times \\Delta t$<br\/>Thay s\u1ed1: $Q=0,18\\times 4200\\times (54,4-36,6)= 13456,8J$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2934},{"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\u00f9ng c\u00e1c \u0111\u00e8n c\u1ed3n gi\u1ed1ng h\u1ec7t nhau \u0111\u1ec3 \u0111un c\u00e1c b\u00ecnh n\u01b0\u1edbc ch\u1ee9a c\u00e1c ch\u1ea5t l\u1ecfng kh\u00e1c nhau, c\u00f9ng th\u1ec3 t\u00edch trong c\u00f9ng m\u1ed9t kho\u1ea3ng th\u1eddi gian, ng\u01b0\u1eddi ta th\u1ea5y nhi\u1ec7t c\u00e1c ch\u1ea5t l\u1ecfng trong c\u00e1c b\u00ecnh l\u00e0 kh\u00e1c nhau. Y\u1ebfu t\u1ed1 n\u00e0o l\u00e0m cho nhi\u1ec7t \u0111\u1ed9 c\u1ee7a c\u00e1c ch\u1ea5t \u1edf c\u00e1c b\u00ecnh tr\u1edf n\u00ean kh\u00e1c nhau khi ta \u0111un n\u01b0\u1edbc?","select":["A. Th\u1eddi gian \u0111un.","B. Nhi\u1ec7t l\u01b0\u1ee3ng t\u1eebng b\u00ecnh nh\u1eadn \u0111\u01b0\u1ee3c.","C. L\u01b0\u1ee3ng ch\u1ea5t l\u1ecfng ch\u1ee9a trong t\u1eebng b\u00ecnh.","D. Lo\u1ea1i ch\u1ea5t l\u1ecfng ch\u1ee9a trong t\u1eebng b\u00ecnh."],"hint":"","explain":"<span class='basic_left'>Y\u1ebfu t\u1ed1 l\u00e0m cho nhi\u1ec7t \u0111\u1ed9 c\u1ee7a c\u00e1c ch\u1ea5t \u1edf c\u00e1c b\u00ecnh tr\u1edf n\u00ean kh\u00e1c nhau khi ta \u0111un n\u01b0\u1edbc l\u00e0 lo\u1ea1i ch\u1ea5t l\u1ecfng ch\u1ee9a trong t\u1eebng b\u00ecnh, v\u00ec c\u00e1c ch\u1ea5t l\u1ecfng kh\u00e1c nhau th\u00ec c\u00f3 nhi\u1ec7t dung ri\u00eang kh\u00e1c nhau. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2935},{"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 cung c\u1ea5p cho 10 l\u00edt n\u01b0\u1edbc m\u1ed9t nhi\u1ec7t l\u01b0\u1ee3ng l\u00e0 840kJ. H\u1ecfi n\u01b0\u1edbc n\u00f3ng l\u00ean th\u00eam bao nhi\u00eau \u0111\u1ed9? ","select":["A. $20{}^\\circ C$.","B. $30{}^\\circ C$.","C. $40{}^\\circ C$.","D. $50{}^\\circ C$."],"hint":"","explain":"<span class='basic_left'>\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c $Q=m\\times C\\times \\Delta t$<br\/>Thay s\u1ed1 ta c\u00f3: $\\Delta t=\\dfrac{Q}{m\\times C}=\\dfrac{840000}{10\\times 4200}=20{}^\\circ C$<br\/>V\u1eady, n\u01b0\u1edbc n\u00f3ng l\u00ean th\u00eam $20{}^\\circ C$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2936},{"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":"G\u1ecdi t l\u00e0 nhi\u1ec7t \u0111\u1ed9 l\u00fac sau c\u1ee7a v\u1eadt, ${{t}_{0}}$ l\u00e0 nhi\u1ec7t \u0111\u1ed9 ban \u0111\u1ea7u c\u1ee7a v\u1eadt. C\u00f4ng th\u1ee9c n\u00e0o l\u00e0 c\u00f4ng th\u1ee9c t\u00ednh nhi\u1ec7t l\u01b0\u1ee3ng c\u1ee7a v\u1eadt thu v\u00e0o?","select":["A. $Q=m\\times (t-{{t}_{0}})$.","B. $Q=m\\times C\\times ({{t}_{0}}-t)$.","C. $Q=m\\times C$.","D. $Q=m\\times C\\times (t-{{t}_{0}})$."],"hint":"","explain":"<span class='basic_left'>C\u00f4ng th\u1ee9c t\u00ednh nhi\u1ec7t l\u01b0\u1ee3ng c\u1ee7a v\u1eadt thu v\u00e0o l\u00e0 $Q=m\\times C\\times (t-{{t}_{0}})$.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2937},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Ch\u1ecdn kh\u1eb3ng \u0111\u1ecbnh sai: ","select":["A. Nhi\u1ec7t l\u01b0\u1ee3ng c\u1ee7a v\u1eadt ph\u1ee5 thu\u1ed9c v\u00e0o kh\u1ed1i l\u01b0\u1ee3ng, \u0111\u1ed9 t\u0103ng nhi\u1ec7t \u0111\u1ed9 v\u00e0 nhi\u1ec7t dung ri\u00eang c\u1ee7a v\u1eadt.","B. Kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a v\u1eadt c\u00e0ng l\u1edbn th\u00ec nhi\u1ec7t l\u01b0\u1ee3ng v\u1eadt h\u1ea5p thu \u0111\u1ec3 n\u00f3 n\u00f3ng l\u00ean c\u00e0ng l\u1edbn.","C. \u0110\u1ed9 t\u0103ng nhi\u1ec7t \u0111\u1ed9 c\u1ee7a v\u1eadt c\u00e0ng l\u1edbn th\u00ec nhi\u1ec7t l\u01b0\u1ee3ng v\u1eadt h\u1ea5p thu \u0111\u1ec3 n\u00f3 n\u00f3ng l\u00ean c\u00e0ng nh\u1ecf.","D. C\u00f9ng kh\u1ed1i l\u01b0\u1ee3ng v\u00e0 \u0111\u1ed9 t\u0103ng nhi\u1ec7t \u0111\u1ed9 th\u00ec v\u1eadt n\u00e0o c\u00f3 nhi\u1ec7t dung ri\u00eang l\u1edbn h\u01a1n th\u00ec nhi\u1ec7t l\u01b0\u1ee3ng v\u1eadt h\u1ea5p thu \u0111\u1ec3 n\u00f3ng l\u00ean c\u1ee7a v\u1eadt \u0111\u00f3 l\u1edbn h\u01a1n."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ed9 t\u0103ng nhi\u1ec7t \u0111\u1ed9 c\u1ee7a v\u1eadt c\u00e0ng l\u1edbn th\u00ec nhi\u1ec7t l\u01b0\u1ee3ng v\u1eadt h\u1ea5p thu \u0111\u1ec3 n\u00f3 n\u00f3ng l\u00ean c\u00e0ng l\u1edbn.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2938},{"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\u00f3 4 b\u00ecnh A, B, C v\u00e0 D \u0111\u1ef1ng l\u1ea7n l\u01b0\u1ee3t 1 l\u00edt; 1,5l\u00edt; 2l\u00edt; 2,5l\u00edt n\u01b0\u1edbc \u1edf c\u00f9ng m\u1ed9t nhi\u1ec7t \u0111\u1ed9. Sau khi d\u00f9ng \u0111\u00e8n c\u1ed3n gi\u1ed1ng h\u1ec7t nhau \u0111\u1ec3 \u0111un c\u00e1c b\u00ecnh n\u00e0y trong c\u00f9ng m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u01b0 nhau, ng\u01b0\u1eddi ta th\u1ea5y nhi\u1ec7t \u0111\u1ed9 c\u1ee7a n\u01b0\u1edbc trong c\u00e1c b\u00ecnh tr\u1edf n\u00ean kh\u00e1c nhau. H\u1ecfi b\u00ecnh n\u00e0o c\u00f3 nhi\u1ec7t \u0111\u1ed9 cao nh\u1ea5t?","select":["A. B\u00ecnh A.","B. B\u00ecnh B.","C. B\u00ecnh C.","D. B\u00ecnh D."],"hint":"","explain":"<span class='basic_left'>Khi d\u00f9ng \u0111\u00e8n c\u1ed3n \u0111un nh\u01b0 nhau \u1edf m\u1ed7i b\u00ecnh th\u00ec m\u1ed7i b\u00ecnh nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t l\u01b0\u1ee3ng nhi\u1ec7t nh\u01b0 nhau, do b\u00ecnh A c\u00f3 l\u01b0\u1ee3ng n\u01b0\u1edbc \u00edt nh\u1ea5t n\u00ean n\u00f3 s\u1ebd t\u0103ng nhi\u1ec7t \u0111\u1ed9 cao nh\u1ea5t. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2939}],"lesson":{"save":0,"level":2}}