{"segment":[{"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":"Ch\u1ecdn c\u00e2u sai.","select":["A. Ch\u00e2n kh\u00f4ng d\u1eabn nhi\u1ec7t k\u00e9m nh\u1ea5t.","B. Ch\u1ea5t l\u1ecfng d\u1eabn nhi\u1ec7t k\u00e9m.","C. Ch\u1ea5t kh\u00ed d\u1eabn nhi\u1ec7t c\u00f2n k\u00e9m h\u01a1n ch\u1ea5t l\u1ecfng.","D. Ch\u1ea5t r\u1eafn d\u1eabn nhi\u1ec7t t\u1ed1t."],"hint":"","explain":"<span class='basic_left'>Ch\u00e2n kh\u00f4ng kh\u00f4ng d\u1eabn nhi\u1ec7t, ngo\u1ea1i tr\u1eeb h\u00ecnh th\u1ee9c truy\u1ec1n nhi\u1ec7t b\u1eb1ng b\u1ee9c x\u1ea1. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3020},{"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":"Ch\u1ea5t r\u1eafn c\u00f3 h\u00ecnh d\u1ea1ng v\u00e0 th\u1ec3 t\u00edch x\u00e1c \u0111\u1ecbnh l\u00e0 do trong ch\u1ea5t r\u1eafn:","select":["A. L\u1ef1c li\u00ean k\u1ebft gi\u1eefa c\u00e1c ph\u00e2n t\u1eed ch\u1ea5t r\u1eafn l\u00e0 r\u1ea5t y\u1ebfu, c\u00e1c ph\u00e2n t\u1eed ch\u1ec9 dao \u0111\u1ed9ng kh\u00f4ng ng\u1eebng quanh m\u1ed9t v\u1ecb tr\u00ed x\u00e1c \u0111\u1ecbnh.","B. L\u1ef1c li\u00ean k\u1ebft gi\u1eefa c\u00e1c ph\u00e2n t\u1eed ch\u1ea5t r\u1eafn l\u00e0 r\u1ea5t l\u1edbn, c\u00e1c ph\u00e2n t\u1eed ch\u1ec9 dao \u0111\u1ed9ng kh\u00f4ng ng\u1eebng quanh m\u1ed9t v\u1ecb tr\u00ed x\u00e1c \u0111\u1ecbnh.","C. C\u00e1c ph\u01b0\u01a1ng \u00e1n \u0111\u01b0a ra \u0111\u1ec1u sai. ","D. L\u1ef1c li\u00ean k\u1ebft gi\u1eefa c\u00e1c ph\u00e2n t\u1eed ch\u1ea5t r\u1eafn l\u00e0 r\u1ea5t l\u1edbn, c\u00e1c ph\u00e2n t\u1eed ch\u1ec9 \u0111\u1ee9ng y\u00ean t\u1ea1i m\u1ed9t v\u1ecb tr\u00ed x\u00e1c \u0111\u1ecbnh."],"hint":"","explain":"<span class='basic_left'>Ch\u1ea5t r\u1eafn c\u00f3 h\u00ecnh d\u1ea1ng v\u00e0 th\u1ec3 t\u00edch x\u00e1c \u0111\u1ecbnh l\u00e0 do trong ch\u1ea5t r\u1eafn th\u00ec l\u1ef1c li\u00ean k\u1ebft gi\u1eefa c\u00e1c ph\u00e2n t\u1eed ch\u1ea5t r\u1eafn l\u00e0 r\u1ea5t l\u1edbn, c\u00e1c ph\u00e2n t\u1eed ch\u1ec9 dao \u0111\u1ed9ng kh\u00f4ng ng\u1eebng quanh m\u1ed9t v\u1ecb tr\u00ed x\u00e1c \u0111\u1ecbnh. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3021},{"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 c\u00e1c nguy\u00ean t\u1eed, ph\u00e2n t\u1eed c\u1ea5u t\u1ea1o n\u00ean v\u1eadt chuy\u1ec3n \u0111\u1ed9ng h\u1ed7n \u0111\u1ed9n kh\u00f4ng ng\u1eebng nhanh l\u00ean th\u00ec \u0111\u1ea1i l\u01b0\u1ee3ng n\u00e0o sau \u0111\u00e2y t\u0103ng l\u00ean?","select":["A. Tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt.","B. C\u1ea3 kh\u1ed1i l\u01b0\u1ee3ng l\u1eabn tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt.","C. Nhi\u1ec7t \u0111\u1ed9 c\u1ee7a v\u1eadt.","D. Kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a v\u1eadt."],"hint":"","explain":"<span class='basic_left'>Khi c\u00e1c nguy\u00ean t\u1eed, ph\u00e2n t\u1eed c\u1ea5u t\u1ea1o n\u00ean v\u1eadt chuy\u1ec3n \u0111\u1ed9ng h\u1ed7n \u0111\u1ed9n kh\u00f4ng ng\u1eebng nhanh l\u00ean th\u00ec nhi\u1ec7t \u0111\u1ed9 c\u1ee7a v\u1eadt t\u0103ng l\u00ean. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3022},{"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":"\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 460J\/kg.K. 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 = 306,667W.","B. P = 3066,67W.","C. P = 306,667kW.","D. P = 3066,67kW."],"hint":"","explain":"<span class='basic_left'>L\u01b0\u1ee3ng nhi\u1ec7t b\u00faa nh\u1eadn \u0111\u01b0\u1ee3c: $Q=mC\\Delta t=12\\times 20\\times 460=110400J$ <br\/>C\u00f4ng c\u1ee7a b\u00faa sinh ra: $A=\\dfrac{Q}{0,4}=276000J$ <br\/>C\u00f4ng su\u1ea5t c\u1ee7a b\u00faa l\u00e0: $P=\\dfrac{A}{t}=\\dfrac{276000}{90}=3066,67W$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3023},{"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 th\u00e1c n\u01b0\u1edbc cao 126 m v\u00e0 \u0111\u1ed9 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 c\u1ee7a n\u01b0\u1edbc \u1edf \u0111\u1ec9nh v\u00e0 ch\u00e2n th\u00e1c l\u00e0 $0,3{}^\\circ C$. Gi\u1ea3 thi\u1ebft r\u1eb1ng khi ch\u1ea1m v\u00e0o ch\u00e2n th\u00e1c, to\u00e0n b\u1ed9 \u0111\u1ed9ng n\u0103ng c\u1ee7a n\u01b0\u1edbc chuy\u1ec3n h\u1ebft th\u00e0nh nhi\u1ec7t n\u0103ng truy\u1ec1n cho n\u01b0\u1edbc. H\u00e3y t\u00ednh nhi\u1ec7t dung ri\u00eang c\u1ee7a n\u01b0\u1edbc. (Cho $g=10m\/{{s}^{2}}$)","select":["A. 420J\/kg.K.","B. 4200J\/kg.K.","C. 480J\/kg.K.","D. 2500J\/kg.K."],"hint":"","explain":"<span class='basic_left'>X\u00e9t m\u1ed9t l\u01b0\u1ee3ng n\u01b0\u1edbc kh\u1ed1i l\u01b0\u1ee3ng l\u00e0 m. <br\/>L\u01b0\u1ee3ng nhi\u1ec7t n\u01b0\u1edbc nh\u1eadn l\u00e0: $Q=mC\\Delta t$<br\/>\u0110\u1ed9ng n\u0103ng c\u1ee7a n\u01b0\u1edbc \u1edf ch\u00e2n th\u00e1c b\u1eb1ng th\u1ebf n\u0103ng c\u1ee7a n\u01b0\u1edbc \u1edf \u0111\u1ec9nh th\u00e1c. <br\/>${{W}_{d}}={{W}_{t}}=mgh$<br\/>M\u00e0 do to\u00e0n b\u1ed9 \u0111\u1ed9ng n\u0103ng c\u1ee7a n\u01b0\u1edbc chuy\u1ec3n h\u1ebft th\u00e0nh nhi\u1ec7t l\u01b0\u1ee3ng truy\u1ec1n cho n\u01b0\u1edbc, n\u00ean ta c\u00f3:<br\/>$Q=mC\\Delta t={{W}_{d}}={{W}_{t}}=mgh$<br\/>V\u1eady $C=\\dfrac{mgh}{m\\Delta t}=\\dfrac{10\\times 126}{0,3}=4200J\/kg.K.$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3024},{"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":"T\u1ea1i sao nhi\u1ec7t \u0111\u1ed9 trung b\u00ecnh c\u1ee7a Tr\u00e1i \u0110\u1ea5t l\u00e0 300K?","select":["A. Do t\u1ea1i nhi\u1ec7t \u0111\u1ed9 300K Tr\u00e1i \u0110\u1ea5t b\u1ee9c x\u1ea1 nhi\u1ec7t v\u00e0o kh\u00f4ng gian v\u1edbi c\u00f9ng m\u1ed9t t\u1ed1c \u0111\u1ed9 nh\u01b0 n\u0103ng l\u01b0\u1ee3ng b\u1ee9c x\u1ea1 nhi\u1ec7t m\u00e0 n\u00f3 nh\u1eadn \u0111\u01b0\u1ee3c t\u1eeb M\u1eb7t Tr\u1eddi.","B. Do s\u1ef1 c\u00e2n b\u1eb1ng sinh th\u00e1i c\u1ee7a sinh v\u1eadt tr\u00ean Tr\u00e1i \u0110\u1ea5t.","C. \u1ede nhi\u1ec7t \u0111\u1ed9 300K chuy\u1ec3n \u0111\u1ed9ng quay c\u1ee7a Tr\u00e1i \u0110\u1ea5t quanh M\u1eb7t Tr\u1eddi l\u00e0 \u1ed5n \u0111\u1ecbnh nh\u1ea5t.","D. Do \u1edf nhi\u1ec7t \u0111\u1ed9 300K, n\u0103ng l\u01b0\u1ee3ng b\u1ee9c x\u1ea1 nhi\u1ec7t m\u00e0 Tr\u00e1i \u0110\u1ea5t nh\u1eadn t\u1eeb M\u1eb7t Tr\u1eddi kh\u00f4ng c\u00f3 t\u00e1c d\u1ee5ng l\u00e0m t\u0103ng nhi\u1ec7t \u0111\u1ed9 c\u1ee7a Tr\u00e1i \u0110\u1ea5t."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t \u0111\u1ed9 trung b\u00ecnh c\u1ee7a Tr\u00e1i \u0110\u1ea5t l\u00e0 300K v\u00ec do t\u1ea1i nhi\u1ec7t \u0111\u1ed9 300K Tr\u00e1i \u0110\u1ea5t b\u1ee9c x\u1ea1 nhi\u1ec7t v\u00e0o kh\u00f4ng gian v\u1edbi c\u00f9ng m\u1ed9t t\u1ed1c \u0111\u1ed9 nh\u01b0 n\u0103ng l\u01b0\u1ee3ng b\u1ee9c x\u1ea1 nhi\u1ec7t m\u00e0 n\u00f3 nh\u1eadn \u0111\u01b0\u1ee3c t\u1eeb M\u1eb7t Tr\u1eddi. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3025},{"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 15 kg c\u1ee7i kh\u00f4 c\u00f3 th\u1ec3 \u0111\u1ec3 \u0111un s\u00f4i 12l\u00edt n\u01b0\u1edbc t\u1eeb $24{}^\\circ C$. Bi\u1ebft n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a c\u1ee7i kh\u00f4 l\u00e0 ${{10}^{7}}J\/kg$, nhi\u1ec7t dung ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 c = 4200J\/kg.\u0111\u1ed9. Hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ebfp c\u00f3 th\u1ec3 l\u00e0 gi\u00e1 tr\u1ecb n\u00e0o trong c\u00e1c gi\u00e1 tr\u1ecb sau:","select":["A. H = 2,550% .","B. H = 2,525% .","C. H = 2,055% .","D. H = 2,505%."],"hint":"","explain":"<span class='basic_left'>L\u01b0\u1ee3ng nhi\u1ec7t b\u1ebfp sinh ra: ${{Q}_{1}}=15\\times {{10}^{7}}J$ <br\/>L\u01b0\u1ee3ng nhi\u1ec7t n\u01b0\u1edbc nh\u1eadn v\u00e0o l\u00e0: ${{Q}_{2}}=12\\times (100-24)\\times 4200=3,83\\times {{10}^{6}}J$ <br\/>Hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ebfp l\u00e0:$H=\\dfrac{{{Q}_{2}}}{{{Q}_{1}}}=\\dfrac{3,83\\times {{10}^{6}}}{15\\times {{10}^{7}}}=2,55$% <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3026},{"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 m\u1ec7nh \u0111\u1ec1 c\u00f3 s\u1eed d\u1ee5ng c\u1ee5m t\u1eeb 'n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t' sau \u0111\u00e2y, m\u1ec7nh \u0111\u1ec3 n\u00e0o \u0111\u00fang?","select":["A. N\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a nhi\u00ean li\u1ec7u.","B. N\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n.","C. N\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a m\u1ed9t v\u1eadt. ","D. N\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a \u0111\u1ed9ng c\u01a1 nhi\u1ec7t."],"hint":"","explain":"<span class='basic_left'>Ch\u1ec9 c\u00f3 nhi\u00ean li\u1ec7u m\u1edbi c\u00f3 \u0111\u1ea1i l\u01b0\u1ee3ng 'n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t'<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3027},{"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 c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 0,5kg ch\u1ee9a 2l\u00edt n\u01b0\u1edbc \u1edf $25{}^\\circ C$. Mu\u1ed1n \u0111un s\u00f4i \u1ea5m n\u01b0\u1edbc n\u00e0y c\u1ea7n m\u1ed9t nhi\u1ec7t l\u01b0\u1ee3ng b\u1eb1ng bao nhi\u00eau?","select":["A. Q = 663000kJ.","B. Q = 66300kJ.","C. Q = 66300J.","D. Q = 663000J."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n \u0111un s\u00f4i n\u01b0\u1edbc l\u00e0: <br\/>$Q={{Q}_{nc}}+{{Q}_{nhom}}={{m}_{1}}{{C}_{1}}\\Delta t+{{m}_{2}}{{C}_{2}}\\Delta t=0,5\\times 880\\times (100-25)+2\\times 4200\\times (100-250)=663000J$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3028},{"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":"Ba ch\u1ea5t l\u1ecfng A, B, C \u0111ang \u1edf nhi\u1ec7t \u0111\u1ed9 ${{t}_{A}}$, ${{t}_{B}}$, ${{t}_{C}}$ v\u1edbi ${{t}_{A}}>{{t}_{B}}>{{t}_{C}}$\u0111\u01b0\u1ee3c tr\u1ed9n l\u1eabn v\u1edbi nhau. Ch\u1ea5t l\u1ecfng n\u00e0o t\u1ecfa nhi\u1ec7t, ch\u1ea5t l\u1ecfng n\u00e0o thu nhi\u1ec7t? Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n tr\u1ea3 l\u1eddi \u0111\u00fang nh\u1ea5t.","select":["A. A v\u00e0 B t\u1ecfa nhi\u1ec7t, C thu nhi\u1ec7t.","B. A t\u1ecfa nhi\u1ec7t, B v\u00e0 C thu nhi\u1ec7t.","C. C t\u1ecfa nhi\u1ec7t, A v\u00e0 B thu nhi\u1ec7t.","D. C\u00e2u tr\u1ea3 l\u1eddi ph\u1ea3i t\u00f9y thu\u1ed9c v\u00e0o nhi\u1ec7t \u0111\u1ed9 cu\u1ed1i c\u00f9ng sau khi c\u00f3 c\u00e2n b\u1eb1ng nhi\u1ec7t."],"hint":"","explain":"<span class='basic_left'>C\u00e2u tr\u1ea3 l\u1eddi ph\u1ea3i t\u00f9y thu\u1ed9c v\u00e0o nhi\u1ec7t \u0111\u1ed9 cu\u1ed1i c\u00f9ng sau khi c\u00f3 c\u00e2n b\u1eb1ng nhi\u1ec7t. <br\/>Ch\u1ea5t n\u00e0o c\u00f3 nhi\u1ec7t \u0111\u1ed9 ban \u0111\u1ea7u cao h\u01a1n nhi\u1ec7t \u0111\u1ed9 sau c\u00f9ng c\u1ee7a h\u1ed7n h\u1ee3p th\u00ec ch\u1ea5t \u0111\u00f3 t\u1ecfa nhi\u1ec7t. <br\/>Ch\u1ea5t n\u00e0o c\u00f3 nhi\u1ec7t \u0111\u1ed9 ban \u0111\u1ea7u th\u1ea5p h\u01a1n nhi\u1ec7t \u0111\u1ed9 sau c\u00f9ng c\u1ee7a h\u1ed7n h\u1ee3p th\u00ec ch\u1ea5t \u0111\u00f3 thu nhi\u1ec7t.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3029},{"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":"Ng\u01b0\u1eddi ta cung c\u1ea5p cho 5l\u00edt n\u01b0\u1edbc m\u1ed9t nhi\u1ec7t l\u01b0\u1ee3ng l\u00e0 Q = 600kJ. Cho nhi\u1ec7t dung ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 C = 4190J\/kg.\u0111\u1ed9. H\u1ecfi n\u01b0\u1edbc s\u1ebd n\u00f3ng th\u00eam bao nhi\u00eau \u0111\u1ed9?","select":["A. N\u00f3ng th\u00eam $30,7{}^\\circ C$.","B. N\u00f3ng th\u00eam $28,7{}^\\circ C$.","C. N\u00f3ng th\u00eam $34,7{}^\\circ C$.","D. N\u00f3ng th\u00eam $32,7{}^\\circ C$."],"hint":"","explain":"<span class='basic_left'>G\u1ecdi $\\Delta t$ l\u00e0 \u0111\u1ed9 t\u0103ng nhi\u1ec7t \u0111\u1ed9 c\u1ee7a n\u01b0\u1edbc:<br\/>Ta c\u00f3: $Q=mC\\Delta t$ n\u00ean $\\Delta t=\\dfrac{Q}{mC}=\\dfrac{600000}{5\\times 4190}=28,7{}^\\circ C$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3030},{"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":"Trong c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng sau \u0111\u00e2y, hi\u1ec7n t\u01b0\u1ee3ng n\u00e0o li\u00ean quan \u0111\u1ebfn d\u1eabn nhi\u1ec7t?","select":["A. D\u00f9ng m\u1ed9t que s\u1eaft d\u00e0i \u0111\u01b0a m\u1ed9t \u0111\u1ea7u v\u00e0o b\u1ebfp than \u0111ang ch\u00e1y \u0111\u1ecf, m\u1ed9t l\u00fac sau c\u1ea7m v\u00e0o \u0111\u1ea7u c\u00f2n l\u1ea1i ta th\u1ea5y n\u00f3ng tay.","B. Nh\u00fang m\u1ed9t \u0111\u1ea7u chi\u1ebfc th\u00eca b\u1eb1ng b\u1ea1c v\u00e0o m\u1ed9t c\u1ed1c n\u01b0\u1edbc s\u00f4i ta c\u00f3 c\u1ea3m gi\u00e1c tay b\u1ecb n\u00f3ng l\u00ean.","C. Khi \u0111un n\u01b0\u1edbc trong \u1ea5m, n\u01b0\u1edbc s\u1ebd n\u00f3ng d\u1ea7n l\u00ean n\u1ebfu th\u00f2 m\u1ed9t ng\u00f3n tay v\u00e0o n\u01b0\u1edbc ta th\u1ea5y \u1ea5m tay.","D. C\u1ea3 ba tr\u01b0\u1eddng h\u1ee3p n\u00eau ra \u0111\u1ec1u li\u00ean qua \u0111\u1ebfn hi\u1ec7n t\u01b0\u1ee3ng d\u1eabn nhi\u1ec7t."],"hint":"","explain":"<span class='basic_left'>C\u1ea3 ba tr\u01b0\u1eddng h\u1ee3p n\u00eau ra \u0111\u1ec1u li\u00ean qua \u0111\u1ebfn hi\u1ec7n t\u01b0\u1ee3ng d\u1eabn nhi\u1ec7t.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3031},{"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":"\u0110\u1ee9ng g\u1ea7n m\u1ed9t ng\u1ecdn l\u1eeda tr\u1ea1i ho\u1eb7c m\u1ed9t l\u00f2 s\u01b0\u1edfi, ta c\u1ea3m th\u1ea5y n\u00f3ng. Nhi\u1ec7t l\u01b0\u1ee3ng truy\u1ec1n t\u1eeb ng\u1ecdn l\u1eeda \u0111\u1ebfn ta b\u1eb1ng c\u00e1ch n\u00e0o?","select":["A. Ch\u1ee7 y\u1ebfu l\u00e0 b\u1ee9c x\u1ea1 nhi\u1ec7t, m\u1ed9t ph\u1ea7n do d\u1eabn nhi\u1ec7t.","B. S\u1ef1 d\u1eabn nhi\u1ec7t c\u1ee7a kh\u00f4ng kh\u00ed.","C. S\u1ef1 b\u1ee9c x\u1ea1 nhi\u1ec7t.","D. S\u1ef1 \u0111\u1ed1i l\u01b0u."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng truy\u1ec1n t\u1eeb ng\u1ecdn l\u1eeda \u0111\u1ebfn ta ch\u1ee7 y\u1ebfu l\u00e0 b\u1ee9c x\u1ea1 nhi\u1ec7t, m\u1ed9t ph\u1ea7n do d\u1eabn nhi\u1ec7t.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3032},{"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":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng:<br\/>.......... c\u00f3 th\u1ec3 truy\u1ec1n t\u1eeb v\u1eadt n\u00e0y sang v\u1eadt kh\u00e1c b\u1eb1ng h\u00ecnh th\u1ee9c d\u1eabn nhi\u1ec7t.","select":["A. B\u1ee9c x\u1ea1 nhi\u1ec7t.","B. D\u1eabn nhi\u1ec7t.","C. \u0110\u1ed1i l\u01b0u.","D. Nhi\u1ec7t n\u0103ng."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t n\u0103ng c\u00f3 th\u1ec3 truy\u1ec1n t\u1eeb v\u1eadt n\u00e0y sang v\u1eadt kh\u00e1c b\u1eb1ng h\u00ecnh th\u1ee9c d\u1eabn nhi\u1ec7t.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3033},{"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 10l\u00edt n\u01b0\u1edbc m\u1ed9t nhi\u1ec7t l\u01b0\u1ee3ng 840kJ. H\u1ecfi n\u01b0\u1edbc n\u00f3ng l\u00ean th\u00eam bao nhi\u00eau \u0111\u1ed9? ","select":["A. T\u0103ng th\u00eam $20{}^\\circ C$.","B. T\u0103ng th\u00eam $30{}^\\circ C$.","C. T\u0103ng th\u00eam $35{}^\\circ C$.","D. T\u0103ng th\u00eam $25{}^\\circ C$."],"hint":"","explain":"<span class='basic_left'>G\u1ecdi $\\Delta t$ l\u00e0 \u0111\u1ed9 t\u0103ng nhi\u1ec7t \u0111\u1ed9 c\u1ee7a n\u01b0\u1edbc:<br\/>Ta c\u00f3: $Q=mC\\Delta t$ <br\/>n\u00ean $\\Delta t=\\dfrac{Q}{mC}=\\dfrac{840000}{10\\times 4200}=20{}^\\circ C$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3034},{"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":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng:<br\/>.......... l\u00e0 h\u1ea1t ch\u1ea5t nh\u1ecf nh\u1ea5t.","select":["A. Ch\u1ea5t.","B. V\u1eadt.","C. Ph\u00e2n t\u1eed.","D. Nguy\u00ean t\u1eed."],"hint":"","explain":"<span class='basic_left'>Nguy\u00ean t\u1eed l\u00e0 h\u1ea1t ch\u1ea5t nh\u1ecf nh\u1ea5t.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3035},{"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\u1ed9ng c\u01a1 sau \u0111\u00e2y, \u0111\u1ed9ng c\u01a1 n\u00e0o l\u00e0 \u0111\u1ed9ng c\u01a1 nhi\u1ec7t?","select":["A. \u0110\u1ed9ng c\u01a1 c\u1ee7a chi\u1ebfc xe m\u00e1y.","B. \u0110\u1ed9ng c\u01a1 c\u1ee7a m\u00e1y xay sinh t\u1ed1.","C. \u0110\u1ed9ng c\u01a1 c\u1ee7a m\u00e1y gi\u1eb7t.","D. \u0110\u1ed9ng c\u01a1 c\u1ee7a m\u00e1y qu\u1ea1t."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ed9ng c\u01a1 c\u1ee7a chi\u1ebfc xe m\u00e1y l\u00e0 \u0111\u1ed9ng c\u01a1 nhi\u1ec7t. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3036},{"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":"\u0110\u1ed1i l\u01b0u l\u00e0 s\u1ef1 truy\u1ec1n nhi\u1ec7t x\u1ea3y ra trong ch\u1ea5t n\u00e0o?","select":["A. Ch\u1ec9 \u1edf ch\u1ea5t l\u1ecfng v\u00e0 ch\u1ea5t kh\u00ed.","B. Ch\u1ec9 \u1edf ch\u1ea5t l\u1ecfng. ","C. \u1ede c\u00e1c ch\u1ea5t l\u1ecfng, ch\u1ea5t kh\u00ed v\u00e0 ch\u1ea5t r\u1eafn.","D. Ch\u1ec9 \u1edf ch\u1ea5t kh\u00ed."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ed1i l\u01b0u l\u00e0 s\u1ef1 truy\u1ec1n nhi\u1ec7t x\u1ea3y ra trong ch\u1ea5t l\u1ecfng v\u00e0 ch\u1ea5t kh\u00ed. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3037},{"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 nhi\u1ec7t l\u01b0\u1ee3ng k\u1ebf ch\u1ee9a 12l\u00edt n\u01b0\u1edbc \u1edf $15{}^\\circ C$. N\u1ebfu b\u1ecf v\u00e0o nhi\u1ec7t l\u01b0\u1ee3ng k\u1ebf m\u1ed9t qu\u1ea3 c\u00e2n b\u1eb1ng \u0111\u1ed3ng thau kh\u1ed1i l\u01b0\u1ee3ng 500g \u0111\u00e3 \u0111\u01b0\u1ee3c nung n\u00f3ng t\u1edbi $100{}^\\circ C$. H\u1ecfi n\u01b0\u1edbc n\u00f3ng l\u00ean t\u1edbi bao nhi\u00eau \u0111\u1ed9? L\u1ea5y nhi\u1ec7t dung ri\u00eang c\u1ee7a \u0111\u1ed3ng thau l\u00e0 368J\/kg.K, c\u1ee7a n\u01b0\u1edbc l\u00e0 4186J\/kg.K. B\u1ecf qua nhi\u1ec7t l\u01b0\u1ee3ng truy\u1ec1n nhi\u1ec7t cho nhi\u1ec7t l\u01b0\u1ee3ng k\u1ebf ra ngo\u00e0i.","select":["A. t = $16,3{}^\\circ C$.","B. t = $15,3{}^\\circ C$.","C. t = $17,3{}^\\circ C$.","D. t = $14,3{}^\\circ C$."],"hint":"","explain":"<span class='basic_left'>G\u1ecdi nhi\u1ec7t \u0111\u1ed9 sau c\u00f9ng c\u1ee7a h\u1ec7 l\u00e0 t. <br\/>Nhi\u1ec7t l\u01b0\u1ee3ng n\u01b0\u1edbc nh\u1eadn v\u00e0o l\u00e0:${{Q}_{thu}}=12\\times (t-15)\\times 4186$ <br\/>Nhi\u1ec7t l\u01b0\u1ee3ng \u0111\u1ed3ng to\u1ea3 ra l\u00e0: ${{Q}_{toa}}=0,5\\times (100-t)\\times 368$ <br\/>Ta c\u00f3 ${{Q}_{toa}}={{Q}_{thu}}$ n\u00ean suy ra $t=15,3{}^\\circ C$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3038},{"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\u1ed9ng c\u01a1 c\u1ee7a m\u1ed9t m\u00e1y bay c\u00f3 c\u00f4ng su\u1ea5t $2\\times {{10}^{6}}$W v\u00e0 hi\u1ec7u su\u1ea5t 30%. H\u1ecfi v\u1edbi m\u1ed9t t\u1ea5n x\u0103ng, m\u00e1y bay c\u00f3 th\u1ec3 bay \u0111\u01b0\u1ee3c bao l\u00e2u? N\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a x\u0103ng l\u00e0 $4,6\\times {{10}^{7}}$ J\/kg.","select":["A. t = 1 gi\u1edd.","B. t = 1 gi\u1edd 45 ph\u00fat.","C. t = 1 gi\u1edd 25 ph\u00fat.","D. t = 1 gi\u1edd 55 ph\u00fat."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng do x\u0103ng sinh ra:<br\/> $Q=m\\times q=1000\\times 4,6\\times {{10}^{7}}=4,6\\times {{10}^{10}}J$ <br\/> C\u00f4ng c\u1ee7a \u0111\u1ed9ng c\u01a1:$A=30%\\times Q$ <br\/> Th\u1eddi gian bay:<br\/> $t=\\dfrac{A}{P}=\\dfrac{30%\\times 4,6\\times {{10}^{10}}}{2\\times {{10}^{6}}}=6900s=1h55m$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3039}],"lesson":{"save":0,"level":2}}