{"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":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop8/vatly/bai26/lv2/img\/h1.jpg'\/><\/center>H\u00e3y d\u1ef1a v\u00e0o b\u1ea3n \u0111\u1ed3 ti\u00eau th\u1ee5, khai th\u00e1c v\u00e0 d\u1ef1 tr\u1eef d\u1ea7u v\u1ebd \u1edf h\u00ecnh sau \u0111\u1ec3 ch\u1ecdn c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang cho c\u00e2u h\u1ecfi sau \u0111\u00e2y. N\u1ebfu duy tr\u00ec m\u1ee9c \u0111\u1ed9 khai th\u00e1c d\u1ea7u nh\u01b0 trong b\u1ea3n \u0111\u1ed3 th\u00ec khu v\u1ef1c n\u00e0o tr\u00ean th\u1ebf gi\u1edbi c\u00f3 nguy c\u01a1 c\u1ea1n ki\u1ec7t ngu\u1ed3n d\u1ef1 tr\u1eef d\u1ea7u trong 10 n\u0103m t\u1edbi?","select":["A. Trung \u0110\u00f4ng.","B. \u0110\u00f4ng Nam \u00c1. ","C. B\u1eafc M\u0129.","D. Ch\u00e2u \u00c2u."],"hint":"","explain":"<span class='basic_left'>L\u01b0\u1ee3ng ti\u00eau th\u1ee5 v\u01b0\u1ee3t qu\u00e1 l\u1edbn so v\u1edbi l\u01b0\u1ee3ng khai th\u00e1c n\u00ean \u1edf B\u1eafc M\u0129 c\u00f3 nguy c\u01a1 c\u1ea1n ki\u1ec7t ngu\u1ed3n d\u1ef1 tr\u1eef d\u1ea7u trong 10 n\u0103m t\u1edbi. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2960},{"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":"C\u00f4ng th\u1ee9c t\u00ednh nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra khi \u0111\u1ed1t ch\u00e1y m kg nhi\u00ean li\u1ec7u l\u00e0?","select":["A. $Q=m\\times c\\times \\Delta t$.","B. $Q=q\\times m$.","C. $Q=\\dfrac{q}{m}$.","D. $Q=\\dfrac{m}{q}$."],"hint":"","explain":"<span class='basic_left'>C\u00f4ng th\u1ee9c t\u00ednh nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra khi \u0111\u1ed1t ch\u00e1y m kg nhi\u00ean li\u1ec7u l\u00e0 $Q=q\\times m$.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2961},{"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":"C\u00f4ng th\u1ee9c t\u00ednh hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ebfp l\u00e0?","select":["A. $H=\\dfrac{{{Q}_{toa}}}{{{Q}_{thu}}}$.","B. $H=\\dfrac{{{Q}_{thu}}}{{{Q}_{toa}}}$.","C. $H={{Q}_{thu}}\\times {{Q}_{toa}}$ .","D. $H={{(\\dfrac{{{Q}_{thu}}}{{{Q}_{toa}}})}^{2}}$."],"hint":"","explain":"<span class='basic_left'>$H=\\dfrac{{{Q}_{thu}}}{{{Q}_{toa}}}$.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2962},{"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\u00ednh nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra khi \u0111\u1ed1t ch\u00e1y ho\u00e0n to\u00e0n 15kg than \u0111\u00e1. \u0110\u1ec3 thu \u0111\u01b0\u1ee3c nhi\u1ec7t l\u01b0\u1ee3ng tr\u00ean c\u1ea7n \u0111\u1ed1t ch\u00e1y h\u1ebft bao nhi\u00eau kg d\u1ea7u h\u1ecfa?","select":["A. 9,2 kg","B. 8,2 kg","C. 7,2 kg","D. 6,2 kg"],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra khi \u0111\u1ed1t ch\u00e1y ho\u00e0n to\u00e0n 15kg than \u0111\u00e1 l\u00e0:<br\/>${{Q}_{2}}={{q}_{2}}\\times {{m}_{2}}=27\\times {{10}^{6}}\\times 15=4,05\\times {{10}^{8}}J$ <br\/>L\u01b0\u1ee3ng d\u1ea7u h\u1ecfa c\u1ea7n d\u00f9ng \u0111\u1ec3 khi \u0111\u1ed1t ch\u00e1y thu \u0111\u01b0\u1ee3c nhi\u1ec7t tr\u00ean l\u00e0: <br\/>$m=\\dfrac{{{Q}_{2}}}{q}=\\dfrac{4,05\\times {{10}^{8}}}{44\\times {{10}^{6}}}=9,2kg$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2963},{"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":"H\u00e3y cho bi\u1ebft n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a kh\u00ed \u0111\u1ed1t b\u1eb1ng bao nhi\u00eau l\u1ea7n n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a than b\u00f9n?","select":["A. 2,56.","B. 3,14.","C. 5,87.","D. 4,87."],"hint":"","explain":"<span class='basic_left'>N\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a kh\u00ed \u0111\u1ed1t b\u1eb1ng $44\\times {{10}^{6}}J\/kg$ <br\/>N\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a than b\u00f9n b\u1eb1ng $14\\times {{10}^{6}}J\/kg$<br\/>\u21d2 N\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a kh\u00ed \u0111\u1ed1t b\u1eb1ng 3,14 l\u1ea7n than b\u00f9n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2964},{"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":"Ta n\u00f3i r\u1eb1ng n\u0103ng su\u1ea5t to\u1ea3 nhi\u1ec7t c\u1ee7a kh\u00ed \u0111\u1ed1t l\u00e0 $44\\times {{10}^{-6}}$ (J\/kg) , con s\u1ed1 n\u00e0y c\u00f3 ngh\u0129a g\u00ec?","select":["A. C\u00f3 ngh\u0129a l\u00e0 1kg kh\u00ed \u0111\u1ed1t b\u1ecb \u0111\u1ed1t ch\u00e1y s\u1ebd to\u1ea3 ra nhi\u1ec7t l\u01b0\u1ee3ng l\u1edbn h\u01a1n $44\\times {{10}^{-6}}$J.","B. C\u00f3 ngh\u0129a l\u00e0 1kg kh\u00ed \u0111\u1ed1t b\u1ecb \u0111\u1ed1t ch\u00e1y ho\u00e0n to\u00e0n to\u1ea3 ra nhi\u1ec7t l\u01b0\u1ee3ng nh\u1ecf h\u01a1n ho\u1eb7c b\u1eb1ng $44\\times {{10}^{-6}}$ J.","C. C\u00f3 ngh\u0129a l\u00e0 1kg kh\u00ed \u0111\u1ed1t b\u1ecb \u0111\u1ed1t ch\u00e1y ho\u00e0n to\u00e0n to\u1ea3 ra nhi\u1ec7t l\u01b0\u1ee3ng b\u1eb1ng $44\\times {{10}^{-6}}$J.","D. C\u00f3 ngh\u0129a l\u00e0 1 \u0111\u01a1n v\u1ecb kh\u1ed1i l\u01b0\u1ee3ng kh\u00ed \u0111\u1ed1t b\u1ecb \u0111\u1ed1t ch\u00e1y ho\u00e0n to\u00e0n to\u1ea3 ra nhi\u1ec7t l\u01b0\u1ee3ng b\u1eb1ng $44\\times {{10}^{-6}}$J."],"hint":"","explain":"<span class='basic_left'>Con s\u1ed1 n\u00e0y c\u00f3 ngh\u0129a l\u00e0: 1kg kh\u00ed \u0111\u1ed1t b\u1ecb \u0111\u1ed1t ch\u00e1y ho\u00e0n to\u00e0n to\u1ea3 ra nhi\u1ec7t l\u01b0\u1ee3ng b\u1eb1ng $44\\times {{10}^{-6}}$J<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2965},{"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\u1ea1i sao d\u00f9ng b\u1ebfp than c\u00f3 l\u1ee3i h\u01a1n b\u1ebfp c\u1ee7i?","select":["A. V\u00ec than r\u1ebb h\u01a1n c\u1ee7i.","B. V\u00ec than d\u1ec5 \u0111un h\u01a1n c\u1ee7i.","C. V\u00ec than c\u00f3 n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t l\u1edbn h\u01a1n c\u1ee7i.","D. V\u00ec than c\u00f3 nhi\u1ec7t l\u01b0\u1ee3ng l\u1edbn h\u01a1n c\u1ee7i."],"hint":"","explain":"<span class='basic_left'>V\u00ec than c\u00f3 n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t l\u1edbn h\u01a1n c\u1ee7i. Ngo\u00e0i ra, d\u00f9ng b\u1ebfp than c\u00f2n c\u00f3 c\u00e1c l\u1ee3i \u00edch kh\u00e1c nh\u01b0 : g\u00f3p ph\u1ea7n b\u1ea3o v\u1ec7 m\u00f4i tr\u01b0\u1eddng, b\u1ea3o v\u1ec7 r\u1eebng v\u00e0 s\u1eed d\u1ee5ng l\u1ea1i thu\u1eadn ti\u1ec7n, v\u00e0 s\u1ea1ch s\u1ebd h\u01a1n b\u1ebfp c\u1ee7i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2966},{"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 b\u1ebfp d\u00f9ng kh\u00ed \u0111\u1ed1t t\u1ef1 nhi\u00ean c\u00f3 hi\u1ec7u su\u1ea5t 30%. Bi\u1ebft n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a kh\u00ed \u0111\u1ed1t t\u1eeb nhi\u00ean l\u00e0 $44\\times {{10}^{6}}$J\/kg. \u0110\u1ec3 \u0111un s\u00f4i 3 l\u00edt n\u01b0\u1edbc \u1edf $30{}^\\circ C$th\u00ec ph\u1ea3i d\u00f9ng bao nhi\u00eau kh\u00ed \u0111\u1ed1t? ","select":["A. m = 0,6068kg.","B. m = 0,6608kg.","C. m = 0,0668kg.","D. M\u1ed9t k\u1ebft qu\u1ea3 kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng c\u1ea7n \u0111\u1ec3 \u0111un s\u00f4i 3l n\u01b0\u1edbc l\u00e0:<br\/> ${{Q}_{thu}}=m\\times C\\times \\Delta t=3\\times (100-30)\\times 4200=882kJ$<br\/> Nhi\u1ec7t l\u01b0\u1ee3ng do b\u1ebfp t\u1ecfa ra:<br\/>${{Q}_{toa}}=\\dfrac{{{Q}_{thu}}}{0,3}=2940kJ$ <br\/>L\u01b0\u1ee3ng kh\u00ed \u0111\u1ed1t l\u00e0: $m=\\dfrac{2940000}{44000000}=0,0668kg$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2967},{"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":"Bi\u1ebft r\u1eb1ng c\u1ea7n ph\u1ea3i t\u1ed1n 0,25kg d\u1ea7u h\u1ecfa m\u1edbi l\u00e0m cho 4,2l\u00edt n\u01b0\u1edbc t\u1eeb $16{}^\\circ C$ n\u00f3ng t\u1edbi $96{}^\\circ C$. Cho n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a d\u1ea7u h\u1ecfa l\u00e0 $q=44\\times {{10}^{6}}$J\/kg. Hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ebfp d\u1ea7u c\u00f3 th\u1ec3 nh\u1eadn gi\u00e1 tr\u1ecb n\u00e0o trong c\u00e1c gi\u00e1 tr\u1ecb sau:","select":["A. H = 12,83%.","B. H = 13,83%.","C. H = 11,83%.","D. M\u1ed9t k\u1ebft qu\u1ea3 kh\u00e1c"],"hint":"","explain":"<span class='basic_left'>L\u01b0\u1ee3ng nhi\u1ec7t n\u01b0\u1edbc nh\u1eadn v\u00e0o:<br\/> ${{Q}_{1}}=4,2\\times (96-16)\\times 4200=1411200J$ <br\/>L\u01b0\u1ee3ng nhi\u1ec7t b\u1ebfp sinh ra:<br\/> ${{Q}_{2}}=0,25\\times 44\\times {{10}^{6}}=11000000J$ <br\/>Hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ebfp:<br\/>$H=\\dfrac{{{Q}_{1}}}{{{Q}_{2}}}=\\dfrac{1411200}{11000000}=12,83$% <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2968},{"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":"Khi d\u00f9ng b\u1ebfp c\u1ee7i \u0111\u1ec3 \u0111un s\u00f4i 3 l\u00edt n\u01b0\u1edbc t\u1eeb $24{}^\\circ C$ ng\u01b0\u1eddi ta \u0111\u1ed1t h\u1ebft 1,5kg c\u1ee7i kh\u00f4. Cho 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.K. H\u1ecfi nhi\u1ec7t l\u01b0\u1ee3ng \u0111\u00e3 m\u1ea5t m\u00e1t trong qu\u00e1 tr\u00ecnh \u0111un n\u01b0\u1edbc l\u00e0 bao nhi\u00eau?","select":["A. \u0394Q = 14042400J.","B. \u0394Q = 14042,4J.","C. \u0394Q = 1404240J.","D. \u0394Q = 140424J."],"hint":"","explain":"<span class='basic_left'>L\u01b0\u1ee3ng nhi\u1ec7t n\u01b0\u1edbc nh\u1eadn v\u00e0o: ${{Q}_{1}}=3\\times (100-24)\\times 4200=957600J$ <br\/>L\u01b0\u1ee3ng nhi\u1ec7t c\u1ee7i sinh ra l\u00e0: ${{Q}_{2}}=1,5\\times {{10}^{7}}=15000000J$ <br\/>V\u1eady l\u01b0\u1ee3ng nhi\u1ec7t m\u1ea5t \u0111i l\u00e0: $\\Delta Q={{Q}_{2}}-{{Q}_{1}}=15000000-957600=14042400J$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2969},{"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":"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 ngu\u1ed3n \u0111i\u1ec7n.","B. N\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a \u0111\u1ed9ng c\u01a1 nhi\u1ec7t.","C. N\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a nhi\u00ean li\u1ec7u.","D. N\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a m\u1ed9t v\u1eadt."],"hint":"","explain":"<span class='basic_left'>Ch\u1ec9 t\u1ed3n t\u1ea1i n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a nhi\u00ean li\u1ec7u. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2970},{"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":"D\u00f9ng m\u1ed9t b\u1ebfp d\u1ea7u h\u1ecfa \u0111\u1ec3 \u0111un s\u00f4i 2 l\u00edt n\u01b0\u1edbc t\u1eeb $15{}^\\circ C$th\u00ec m\u1ea5t 10 ph\u00fat. Bi\u1ebft r\u1eb1ng ch\u1ec9 c\u00f3 40% nhi\u1ec7t l\u01b0\u1ee3ng do d\u1ea7u h\u1ecfa t\u1ecfa ra l\u00e0m n\u00f3ng n\u01b0\u1edbc. L\u1ea5y nhi\u1ec7t dung ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 4190J\/kg.K, n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a d\u1ea7u h\u1ecfa l\u00e0 $46\\times {{10}^{6}}$J\/kg. H\u1ecfi m\u1ed7i ph\u00fat ph\u1ea3i d\u00f9ng bao nhi\u00eau d\u1ea7u h\u1ecfa?","select":["A. m = 0,00387kg.","B. m = 0,387kg.","C. m = 0,0387kg.","D. M\u1ed9t k\u1ebft qu\u1ea3 kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>L\u01b0\u1ee3ng nhi\u1ec7t c\u1ea7n \u0111\u1ec3 \u0111un s\u00f4i n\u01b0\u1edbc l\u00e0:<br\/>${{Q}_{thu}}=2\\times 4190\\times (100-15)=712300J$ <br\/>L\u01b0\u1ee3ng nhi\u1ec7t do d\u1ea7u t\u1ecfa ra l\u00e0:<br\/>${{Q}_{toa}}=\\dfrac{{{Q}_{thu}}}{40%}=1780750J$ <br\/>Ph\u1ea3i d\u00f9ng d\u1ea7u h\u1ecfa m\u1ed7i ph\u00fat l\u00e0: <br\/>$m=\\dfrac{{{Q}_{toa}}}{10\\times 46\\times {{10}^{6}}}=\\dfrac{1780750}{10\\times 46\\times {{10}^{6}}}=0,00387kg$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2971},{"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 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.K. 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 = 2,055%.","B. H = 2,554%.","C. H = 2,525%.","D. H = 2,505%."],"hint":"","explain":"<span class='basic_left'>L\u01b0\u1ee3ng nhi\u1ec7t c\u1ea7n \u0111\u1ec3 \u0111un s\u00f4i n\u01b0\u1edbc l\u00e0: <br\/>${{Q}_{thu}}=12\\times (100-24)\\times 4200=3830400J$ <br\/>L\u01b0\u1ee3ng nhi\u1ec7t so c\u1ee7i t\u1ecfa ra l\u00e0: <br\/>${{Q}_{toa}}=15\\times {{10}^{7}}J$ <br\/>Hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ebfp l\u00e0:<br\/>$H=\\dfrac{{{Q}_{thu}}}{{{Q}_{toa}}}=\\dfrac{3830400}{15\\times {{10}^{7}}}=2,554$% <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2972},{"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\u00ednh nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra khi \u0111\u1ed1t ch\u00e1y ho\u00e0n to\u00e0n 15kg than \u0111\u00e1. \u0110\u1ec3 thu \u0111\u01b0\u1ee3c nhi\u1ec7t l\u01b0\u1ee3ng tr\u00ean c\u1ea7n \u0111\u1ed1t ch\u00e1y h\u1ebft bao nhi\u00eau kg d\u1ea7u h\u1ecfa? N\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a d\u1ea7u h\u1ecfa l\u00e0 $46\\times {{10}^{6}}$J\/kg v\u00e0 n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a than \u0111\u00e1 l\u00e0 $27\\times {{10}^{6}}$ J\/kg.","select":["A. $Q=4,05\\times {{10}^{8}}$ J; m = 9,2kg.","B. $Q=4,05\\times {{10}^{8}}$J; m = 9,2g.","C. $Q=4,05\\times {{10}^{8}}$kJ; m = 9,2g.","D. $Q=4,05\\times {{10}^{8}}$kJ; m = 9,2kg."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra khi \u0111\u1ed1t ch\u00e1y ho\u00e0n to\u00e0n 15kg than \u0111\u00e1: <br\/>${{Q}_{1}}=15\\times 27\\times {{10}^{6}}=4,05\\times {{10}^{8}}J$ <br\/>Kh\u1ed1i l\u01b0\u1ee3ng d\u1ea7u h\u1ecfa l\u00e0: <br\/>$m=\\dfrac{4,05\\times {{10}^{8}}}{46\\times {{10}^{6}}}=9,2kg$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2973},{"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":"D\u00f9ng b\u1ebfp d\u1ea7u h\u1ecfa \u0111\u1ec3 \u0111un s\u00f4i 2 l\u00edt n\u01b0\u1edbc t\u1eeb $20{}^\\circ C$\u0111\u1ef1ng trong m\u1ed9t \u1ea5m nh\u00f4m c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 0,5kg. Bi\u1ebft ch\u1ec9 c\u00f3 30% nhi\u1ec7t l\u01b0\u1ee3ng do d\u1ea7u h\u1ecfa l\u00e0m n\u00f3ng n\u01b0\u1edbc v\u00e0 \u1ea5m. L\u1ea5y nhi\u1ec7t dung ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 4200J\/kg.K, c\u1ee7a nh\u00f4m l\u00e0 880J\/kg.K, n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a d\u1ea7u h\u1ecfa l\u00e0 $46\\times {{10}^{6}}$J\/kg. H\u1ecfi l\u01b0\u1ee3ng d\u1ea7u h\u1ecfa c\u1ea5n thi\u1ebft c\u00f3 th\u1ec3 nh\u1eadn gi\u00e1 tr\u1ecb n\u00e0o trong c\u00e1c gi\u00e1 tr\u1ecb sau:","select":["A. m = 0,0312kg.","B. m = 0,0512kg.","C. m = 0,0412kg.","D. M\u1ed9t gi\u00e1 tr\u1ecb kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>L\u01b0\u1ee3ng nhi\u1ec7t n\u01b0\u1edbc v\u00e0 \u1ea5m nh\u1eadn v\u00e0o l\u00e0:<br\/> ${{Q}_{thu}}=2\\times (100-20)\\times 4200+0,5\\times (100-20)\\times 880=707200J$ <br\/>L\u01b0\u1ee3ng nhi\u1ec7t do d\u1ea7u h\u1ecfa t\u1ecfa ra l\u00e0: <br\/>${{Q}_{toa}}=\\dfrac{{{Q}_{thu}}}{30%}=2357333J$ <br\/>Kh\u1ed1i l\u01b0\u1ee3ng d\u1ea7u h\u1ecfa l\u00e0: <br\/>$m=\\dfrac{{{Q}_{toa}}}{46\\times {{10}^{6}}}=0,0152kg$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2974},{"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 hi\u1ec7u su\u1ea5t c\u1ee7a m\u1ed9t b\u1ebfp d\u1ea7u, bi\u1ebft ph\u1ea3i t\u1ed1n 150g d\u1ea7u \u0111\u1ec3 \u0111un s\u00f4i 4,5l n\u01b0\u1edbc \u1edf $20{}^\\circ C$.","select":["A. H = 2,191%.","B. H = 0,2191%.","C. H = 21,91%.","D. M\u1ed9t gi\u00e1 tr\u1ecb kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>L\u01b0\u1ee3ng nhi\u1ec7t n\u01b0\u1edbc nh\u1eadn v\u00e0o l\u00e0:<br\/> ${{Q}_{thu}}=m\\times C\\times \\Delta t$ <br\/>L\u01b0\u1ee3ng nhi\u1ec7t do d\u1ea7u h\u1ecfa t\u1ecfa ra l\u00e0:<br\/> ${{Q}_{toa}}=m\\times q$ (q l\u00e0 n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t)<br\/>Hi\u1ec7u su\u1ea5t l\u00e0: $H=\\dfrac{{{Q}_{thu}}}{{{Q}_{toa}}}$ <br\/>T\u1eeb \u0111\u00f3 ta t\u00ednh \u0111\u01b0\u1ee3c H=21,91%<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2975},{"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":"N\u1ebfu n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a c\u1ee7i kh\u00f4 l\u00e0 $10\\times {{10}^{6}}J\/kg$, th\u00ec 1 t\u1ea1 c\u1ee7i kh\u00f4 ch\u00e1y h\u1ebft t\u1ecfa ra nhi\u1ec7t l\u01b0\u1ee3ng l\u00e0?","select":["A. ${{10}^{6}}J$.","B. $10\\times {{10}^{8}}J$.","C. $10\\times {{10}^{9}}J$.","D. $10\\times {{10}^{6}}J$."],"hint":"","explain":"<span class='basic_left'>Nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra c\u1ee7a c\u1ee7i l\u00e0:<br\/> ${{Q}_{toa}}=m\\times q$ (q l\u00e0 n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t)<br\/>Thay s\u1ed1 ta t\u00ednh \u0111\u01b0\u1ee3c nhi\u1ec7t t\u1ecfa ra l\u00e0 $10\\times {{10}^{8}}J$.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2976},{"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\u1ec3 \u0111un s\u00f4i m\u1ed9t l\u01b0\u1ee3ng n\u01b0\u1edbc tr\u00ean b\u1ebfp d\u1ea7u c\u00f3 hi\u1ec7u su\u1ea5t 30% ph\u1ea3i d\u00f9ng h\u1ebft 1l d\u1ea7u. H\u1ecfi mu\u1ed1n \u0111un s\u00f4i c\u00f9ng l\u01b0\u1ee3ng n\u01b0\u1edbc nh\u01b0 th\u1ebf tr\u00ean b\u1ebfp d\u1ea7u c\u00f3 hi\u1ec7u su\u1ea5t 20% th\u00ec c\u1ea7n bao nhi\u00eau l\u00edt d\u1ea7u?","select":["A. 1 l\u00edt d\u1ea7u.","B. 1,5 l\u00edt d\u1ea7u.","C. 2 l\u00edt d\u1ea7u.","D. 2,5 l\u00edt d\u1ea7u."],"hint":"","explain":"<span class='basic_left'>\u0110un s\u00f4i m\u1ed9t l\u01b0\u1ee3ng n\u01b0\u1edbc tr\u00ean b\u1ebfp d\u1ea7u c\u00f3 hi\u1ec7u su\u1ea5t 30% ph\u1ea3i d\u00f9ng h\u1ebft 1l, v\u1eady n\u1ebfu d\u00f9ng b\u1ebfp d\u1ea7u c\u00f3 hi\u1ec7u su\u1ea5t 20% th\u00ec ph\u1ea3i d\u00f9ng l\u01b0\u1ee3ng d\u1ea7u l\u00e0:<br\/>$V=\\dfrac{30%}{20%}\\times 1=1,5L$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2977},{"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 b\u1ebfp d\u1ea7u c\u00f3 hi\u1ec7u su\u1ea5t 30%. T\u00ednh nhi\u1ec7t l\u01b0\u1ee3ng c\u00f3 \u00edch khi \u0111\u1ed1t h\u1ebft 30g d\u1ea7u.n\u0103ng su\u1ea5t t\u1ecfa nhi\u1ec7t c\u1ee7a d\u1ea7u h\u1ecfa l\u00e0 $46\\times {{10}^{6}}$J\/kg. ","select":["A. 3,96 J.","B. 3,96 KJ.","C. 414000J.","D. 4140KJ."],"hint":"","explain":"<span class='basic_left'>L\u01b0\u1ee3ng nhi\u1ec7t c\u00f3 \u00edch do b\u1ebfp sinh ra l\u00e0: <br\/>${{Q}_{coich}}=0,3\\times m\\times K=0,3\\times 0,03\\times 46\\times {{10}^{6}}=414000J$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2978},{"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 b\u1ebfp d\u1ea7u c\u00f3 hi\u1ec7u su\u1ea5t 30% s\u1eed d\u1ee5ng 30g d\u1ea7u th\u00ec c\u00f3 th\u1ec3 \u0111un s\u00f4i bao nhi\u00eau n\u01b0\u1edbc \u1edf $30{}^\\circ C$?","select":["A. 1,4 kg.","B. 1,4 g.","C. 140 g.","D. 14 kg."],"hint":"","explain":"<span class='basic_left'>L\u01b0\u1ee3ng nhi\u1ec7t c\u00f3 \u00edch do b\u1ebfp sinh ra l\u00e0:<br\/>${{Q}_{coich}}=0,3\\times m\\times K=0,3\\times 0,03\\times 46\\times {{10}^{6}}=414000J$<br\/>L\u01b0\u1ee3ng nhi\u1ec7t n\u01b0\u1edbc nh\u1eadn v\u00e0o l\u00e0: <br\/>${{Q}_{thu}}=m\\times (100-30)\\times 4200$ ${{Q}_{coich}}={{Q}_{thu}}$ <br\/>T\u1eeb \u0111\u00f3 ta t\u00ednh \u0111\u01b0\u1ee3c m=1,4kg<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2979}],"lesson":{"save":0,"level":2}}