{"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":"Khi c\u01b0a th\u00e9p, \u0111\u00e3 c\u00f3 s\u1ef1 chuy\u1ec3n h\u00f3a v\u00e0 truy\u1ec1n n\u0103ng l\u01b0\u1ee3ng n\u00e0o x\u1ea3y ra? ","select":["A. C\u01a1 n\u0103ng \u0111\u00e3 chuy\u1ec3n h\u00f3a th\u00e0nh c\u00f4ng c\u01a1 h\u1ecdc.","B. C\u01a1 n\u0103ng \u0111\u00e3 chuy\u1ec3n h\u00f3a th\u00e0nh \u0111\u1ed9ng n\u0103ng.","C. C\u01a1 n\u0103ng \u0111\u00e3 chuy\u1ec3n h\u00f3a th\u00e0nh th\u1ebf n\u0103ng.","D. C\u01a1 n\u0103ng \u0111\u00e3 chuy\u1ec3n h\u00f3a th\u00e0nh nhi\u1ec7t n\u0103ng."],"hint":"","explain":"<span class='basic_left'>Khi c\u01b0a, c\u01a1 n\u0103ng chuy\u1ec3n h\u00f3a th\u00e0nh nhi\u1ec7t n\u0103ng l\u00e0m cho l\u01b0\u1ee1i c\u01b0a v\u00e0 mi\u1ebfng th\u00e9p n\u00f3ng l\u00ean. Ng\u01b0\u1eddi ta ph\u1ea3i cho m\u1ed9t d\u00f2ng n\u01b0\u1edbc nh\u1ecf ch\u1ea3y li\u00ean t\u1ee5c v\u00e0o ch\u1ed7 c\u01b0a \u0111\u1ec3 l\u00e0m ngu\u1ed9i l\u01b0\u1ee1i c\u01b0a v\u00e0 mi\u1ebfng th\u00e9p.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2980},{"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":"Hai h\u00f2n bi th\u00e9p A v\u00e0 B gi\u1ed1ng h\u1ec7t nhau \u0111\u01b0\u1ee3c treo v\u00e0o hai s\u1ee3i d\u00e2y c\u00f3 chi\u1ec1u d\u00e0i nh\u01b0 nhau. Khi k\u00e9o bi A l\u00ean r\u1ed3i cho r\u01a1i xu\u1ed1ng va ch\u1ea1m v\u00e0o bi B, ng\u01b0\u1eddi ta th\u1ea5y bi B b\u1ecb b\u1eafn l\u00ean ngang v\u1edbi \u0111\u1ed9 cao c\u1ee7a bi A tr\u01b0\u1edbc khi th\u1ea3 . H\u1ecfi khi \u0111\u00f3 bi A s\u1ebd \u1edf tr\u1ea1ng th\u00e1i n\u00e0o?","select":["A. \u0110\u1ee9ng y\u00ean \u1edf v\u1ecb tr\u00ed ban \u0111\u1ea7u c\u1ee7a B.","B. Chuy\u1ec3n \u0111\u1ed9ng theo B nh\u01b0ng kh\u00f4ng l\u00ean t\u1edbi \u0111\u01b0\u1ee3c \u0111\u1ed9 cao c\u00f9a B.","C. B\u1eadt tr\u1edf l\u1ea1i v\u1ecb tr\u00ed ban \u0111\u1ea7u.","D. N\u00f3ng l\u00ean."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ee9ng y\u00ean \u1edf v\u1ecb tr\u00ed ban \u0111\u1ea7u c\u1ee7a B, v\u00ec n\u0103ng l\u01b0\u1ee3ng c\u1ee7a A \u0111\u00e3 truy\u1ec1n h\u1ebft cho B.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2981},{"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":"K\u00e9o m\u1ed9t s\u1ee3i d\u00e2y cu\u1ed1n quanh m\u1ed9t \u1ed1ng nh\u00f4m \u0111\u1ef1ng n\u01b0\u1edbc b\u1ecbt k\u00edn n\u00fat, ng\u01b0\u1eddi ta th\u1ea5y n\u01b0\u1edbc trong \u1ed1ng n\u00f3ng l\u00ean r\u1ed3i s\u00f4i, h\u01a1i n\u01b0\u1edbc \u0111\u1ea9y n\u00fat b\u1eadt ra c\u00f9ng v\u1edbi m\u1ed9t l\u1edbp kh\u00f3i tr\u1eafng do c\u00e1c h\u1ea1t n\u01b0\u1edbc r\u1ea5t nh\u1ecf t\u1ea1o th\u00e0nh. H\u1ecfi trong th\u00ed nghi\u1ec7m tr\u00ean \u0111\u00e3 c\u00f3 s\u1ef1 chuy\u1ec3n h\u00f3a c\u01a1 n\u0103ng th\u00e0nh nhi\u1ec7t n\u0103ng x\u1ea3y ra khi n\u00e0o?","select":["A. K\u00e9o \u0111i k\u00e9o l\u1ea1i s\u1ee3i d\u00e2y.","B. N\u01b0\u1edbc n\u00f3ng l\u00ean.","C. H\u01a1i n\u01b0\u1edbc l\u00e0m b\u1eadt n\u00fat ra.","D. H\u01a1i n\u01b0\u1edbc ng\u01b0ng t\u1ee5 th\u00e0nh c\u00e1c gi\u1ecdt n\u01b0\u1edbc nh\u1ecf."],"hint":"","explain":"<span class='basic_left'>1. K\u00e9o \u0111i k\u00e9o l\u1ea1i s\u1ee3i d\u00e2y: C\u01a1 n\u0103ng chuy\u1ec3n h\u00f3a th\u00e0nh nhi\u1ec7t n\u0103ng.<br\/>2. N\u01b0\u1edbc n\u00f3ng l\u00ean: Truy\u1ec1n nhi\u1ec7t n\u0103ng t\u1eeb \u1ed1ng nh\u00f4m v\u00e0o n\u01b0\u1edbc.<br\/>3. H\u01a1i n\u01b0\u1edbc l\u00e0m b\u1eadt n\u00fat ra : Nhi\u1ec7t n\u0103ng chuy\u1ec3n h\u00f3a th\u00e0nh c\u01a1 n\u0103ng.<br\/>4. H\u01a1i n\u01b0\u1edbc ng\u01b0ng t\u1ee5 th\u00e0nh c\u00e1c gi\u1ecdt n\u01b0\u1edbc nh\u1ecf : Truy\u1ec1n nhi\u1ec7t n\u0103ng t\u1eeb h\u01a1i n\u01b0\u1edbc ra m\u00f4i tr\u01b0\u1eddng b\u00ean ngo\u00e0i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2982},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi s\u1ef1 b\u1ea3o to\u00e0n n\u0103ng l\u01b0\u1ee3ng?","select":["A. N\u0103ng l\u01b0\u1ee3ng c\u00f3 chuy\u1ec3n h\u00f3a t\u1eeb d\u1ea1ng n\u00e0y sang d\u1ea1ng kh\u00e1c.","B. Sau khi m\u1ed9t hi\u1ec7n t\u01b0\u1ee3ng x\u1ea3y ra, t\u1ed5ng n\u0103ng l\u01b0\u1ee3ng c\u00f3 tr\u01b0\u1edbc v\u00e0 t\u1ed5ng n\u0103ng l\u01b0\u1ee3ng sau khi hi\u1ec7n t\u01b0\u1ee3ng x\u1ea3y ra lu\u00f4n b\u1eb1ng nhau.","C. N\u0103ng l\u01b0\u1ee3ng kh\u00f4ng th\u1ec3 truy\u1ec1n t\u1eeb v\u1eadt n\u00e0y sang v\u1eadt kh\u00e1c.","D. N\u0103ng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt kh\u00f4ng t\u1ef1 nhi\u00ean sinh ra, c\u0169ng kh\u00f4ng t\u1ef1 nhi\u00ean m\u1ea5t \u0111i."],"hint":"","explain":"<span class='basic_left'>N\u0103ng l\u01b0\u1ee3ng c\u00f3 th\u1ec3 truy\u1ec1n t\u1eeb v\u1eadt n\u00e0y sang v\u1eadt kh\u00e1c.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2983},{"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/bai27/lv2/img\/h5.jpg'\/><\/center>Th\u00ed nghi\u1ec7m c\u1ee7a Jun tr\u00ecnh b\u00e0y trong ph\u1ea7n cho th\u1ea5y, c\u00f4ng m\u00e0 c\u00e1c qu\u1ea3 n\u1eb7ng th\u1ef1c hi\u1ec7n l\u00e0m quay c\u00e1c t\u1ea5m kim lo\u1ea1i \u0111\u1eb7t trong n\u01b0\u1edbc \u0111\u1ebf\u2019 l\u00e0m n\u00f3ng l\u00ean \u0111\u00fang b\u1eb1ng nhi\u1ec7t l\u01b0\u1ee3ng m\u00e0 n\u01b0\u1edbc nh\u1eadn \u0111\u01b0\u1ee3c. Th\u00ed nghi\u1ec7m n\u00e0y ch\u1ee9ng t\u1ecf \u0111i\u1ec1u g\u00ec? Trong c\u00e1c c\u00e2u tr\u1ea3 l\u1eddi sau, c\u00e2u n\u00e0o \u0111\u00fang?","select":["A. N\u0103ng l\u01b0\u1ee3ng \u0111\u01b0\u1ee3c b\u1ea3o to\u00e0n.","B. Nhi\u1ec7t l\u00e0 m\u1ed9t d\u1ea1ng c\u1ee7a n\u0103ng l\u01b0\u1ee3ng.","C. C\u01a1 n\u0103ng c\u00f3 th\u1ec3 chuy\u1ec3n h\u00f3a ho\u00e0n to\u00e0n th\u00e0nh nhi\u1ec7t n\u0103ng.","D. Nhi\u1ec7t n\u0103ng c\u00f3 th\u1ec3 chuy\u1ec3n h\u00f3a ho\u00e0n to\u00e0n th\u00e0nh c\u01a1 n\u0103ng."],"hint":"","explain":"<span class='basic_left'>C\u01a1 n\u0103ng c\u00f3 th\u1ec3 chuy\u1ec3n h\u00f3a ho\u00e0n to\u00e0n th\u00e0nh nhi\u1ec7t n\u0103ng.\u2003<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2984},{"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 mi\u1ebfng ch\u00ec kh\u1ed1i l\u01b0\u1ee3ng 1 kg r\u01a1i t\u1eeb \u0111\u1ed9 cao h = 10 m xu\u1ed1ng \u0111\u1ea5t. Ngay tr\u01b0\u1edbc khi ch\u1ea1m \u0111\u1ea5t:","select":["A. C\u01a1 n\u0103ng c\u1ee7a v\u1eadt l\u00e0 100J.","B. Th\u1ebf n\u0103ng c\u1ee7a v\u1eadt l\u00e0 100J.","C. \u0110\u1ed9ng n\u0103ng c\u1ee7a v\u1eadt l\u00e0 100J.","D. C\u1ea3 A v\u00e0 C \u0111\u1ec1u \u0111\u00fang."],"hint":"","explain":"<span class='basic_left'>Th\u1ebf n\u0103ng ban \u0111\u1ea7u c\u1ee7a v\u1eadt: ${{\\text{W}}_{t}}=mgh=1\\times 10\\times 10=100J$<br\/> V\u1eady khi g\u1ea7n ch\u1ea1m \u0111\u1ea5t, th\u1ebf n\u0103ng c\u1ee7a v\u1eadt chuy\u1ec3n h\u00f3a ho\u00e0n to\u00e0n th\u00e0nh \u0111\u1ed9ng n\u0103ng, c\u01a1 n\u0103ng khi \u0111\u00f3 ch\u1ec9 c\u00f2n b\u1eb1ng \u0111\u1ed9ng n\u0103ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2985},{"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\/>M\u1ed9t v\u1eadt \u0111\u01b0\u1ee3c n\u00e9m t\u1eeb th\u1ea5p l\u00ean cao th\u00ec .............","select":["A. C\u00e1c ph\u01b0\u01a1ng \u00e1n \u0111\u01b0a ra \u0111\u1ec1u \u0111\u00fang.","B. C\u01a1 n\u0103ng c\u1ee7a v\u1eadt bi\u1ebfn to\u00e0n b\u1ed9 th\u00e0nh nhi\u1ec7t n\u0103ng.","C. Th\u1ebf n\u0103ng bi\u1ebfn \u0111\u1ed5i d\u1ea7n th\u00e0nh \u0111\u1ed9ng n\u0103ng.","D. \u0110\u1ed9ng n\u0103ng bi\u1ebfn \u0111\u1ed5i d\u1ea7n th\u00e0nh th\u1ebf n\u0103ng."],"hint":"","explain":"<span class='basic_left'>M\u1ed9t v\u1eadt \u0111\u01b0\u1ee3c n\u00e9m t\u1eeb th\u1ea5p l\u00ean cao th\u00ec \u0111\u1ed9ng n\u0103ng bi\u1ebfn \u0111\u1ed5i d\u1ea7n th\u00e0nh th\u1ebf n\u0103ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2986},{"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 tr\u01b0\u1eddng h\u1ee3p sau \u0111\u00e2y, tr\u01b0\u1eddng h\u1ee3p n\u00e0o c\u00f3 s\u1ef1 truy\u1ec1n c\u01a1 n\u0103ng, nhi\u1ec7t n\u0103ng t\u1eeb v\u1eadt n\u00e0y sang v\u1eadt kh\u00e1c; s\u1ef1 chuy\u1ec3n h\u00f3a gi\u1eefa c\u00e1c d\u1ea1ng c\u01a1 n\u0103ng c\u0169ng nh\u01b0 gi\u1eefa nhi\u1ec7t n\u0103ng v\u00e0 c\u01a1 n\u0103ng? ","select":["A. N\u00e9m m\u1ed9t v\u1eadt l\u00ean cao.","B. D\u00f9ng b\u00faa \u0111\u1eadp nhi\u1ec1u l\u1ea7n v\u00e0o m\u1eb7t m\u1ed9t t\u1ea5m t\u00f4n l\u00e0m cho t\u1ea5m t\u00f4n n\u00f3ng l\u00ean.","C. M\u1ed9t \u0111\u1ed9ng c\u01a1 d\u00f9ng h\u01a1i n\u01b0\u1edbc \u0111ang ho\u1ea1t \u0111\u1ed9ng.","D. C\u1ea3 ba tr\u01b0\u1eddng h\u1ee3p tr\u00ean \u0111\u1ec1u c\u00f3 s\u1ef1 chuy\u1ec3n h\u00f3a gi\u1eefa c\u00e1c d\u1ea1ng c\u01a1 n\u0103ng c\u0169ng nh\u01b0 gi\u1eefa nhi\u1ec7t n\u0103ng v\u00e0 c\u01a1 n\u0103ng."],"hint":"","explain":"<span class='basic_left'>C\u1ea3 ba tr\u01b0\u1eddng h\u1ee3p tr\u00ean \u0111\u1ec1u c\u00f3 s\u1ef1 chuy\u1ec3n h\u00f3a gi\u1eefa c\u00e1c d\u1ea1ng c\u01a1 n\u0103ng c\u0169ng nh\u01b0 gi\u1eefa nhi\u1ec7t n\u0103ng v\u00e0 c\u01a1 n\u0103ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2987},{"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 hi\u1ec7n t\u01b0\u1ee3ng v\u1ec1 dao \u0111\u1ed9ng c\u1ee7a con l\u1eafc, con l\u1eafc ch\u1ec9 dao \u0111\u1ed9ng trong m\u1ed9t th\u1eddi gian ng\u1eafn r\u1ed3i d\u1eebng l\u1ea1i \u1edf v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng. C\u01a1 n\u0103ng c\u1ee7a con l\u1eafc \u0111\u00e3 chuy\u1ec3n h\u00f3a th\u00e0nh d\u1ea1ng n\u0103ng l\u01b0\u1ee3ng n\u00e0o? ","select":["A. C\u01a1 n\u0103ng c\u1ee7a con l\u1eafc \u0111\u00e3 chuy\u1ec3n h\u00f3a th\u00e0nh c\u00f4ng c\u01a1 h\u1ecdc.","B. C\u01a1 n\u0103ng c\u1ee7a con l\u1eafc \u0111\u00e3 chuy\u1ec3n h\u00f3a th\u00e0nh \u0111\u1ed9ng n\u0103ng.","C. C\u01a1 n\u0103ng c\u1ee7a con l\u1eafc \u0111\u00e3 chuy\u1ec3n h\u00f3a th\u00e0nh nhi\u1ec7t n\u0103ng l\u00e0m n\u00f3ng con l\u1eafc v\u00e0 kh\u00f4ng kh\u00ed xung quanh.","D. C\u01a1 n\u0103ng c\u1ee7a con l\u1eafc \u0111\u00e3 chuy\u1ec3n h\u00f3a th\u00e0nh th\u1ebf n\u0103ng."],"hint":"","explain":"<span class='basic_left'>Do ma s\u00e1t v\u1edbi kh\u00f4ng kh\u00ed n\u00ean c\u01a1 n\u0103ng c\u1ee7a con l\u1eafc \u0111\u00e3 chuy\u1ec3n h\u00f3a th\u00e0nh nhi\u1ec7t n\u0103ng l\u00e0m n\u00f3ng con l\u1eafc v\u00e0 kh\u00f4ng kh\u00ed xung quanh.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2988},{"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 phanh xe \u0111\u1ea1p, hai m\u00e1 phanh \u00e1p s\u00e1t v\u00e0o v\u00e0nh xe l\u00e0m cho xe chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n r\u1ed3i d\u1eebng l\u1ea1i. Qu\u00e1 tr\u00ecnh chuy\u1ec3n h\u1ecfa n\u0103ng l\u01b0\u1ee3ng n\u00e0o sau \u0111\u00e2y l\u00e0 ph\u00f9 h\u1ee3p?","select":["A. C\u00f4ng th\u1ef1c hi\u1ec7n l\u00e0m \u0111\u1ed9ng n\u0103ng c\u1ee7a xe gi\u1ea3m.","B. C\u00f4ng th\u1ef1c hi\u1ec7n l\u00e0m th\u1ebf n\u0103ng c\u1ee7a xe gi\u1ea3m.","C. C\u00f4ng th\u1ef1c hi\u1ec7n l\u00e0m nhi\u1ec7t n\u0103ng c\u1ee7a xe gi\u1ea3m.","D. C\u00f4ng th\u1ef1c hi\u1ec7n l\u00e0m th\u1ebf n\u0103ng c\u1ee7a xe t\u0103ng."],"hint":"","explain":"<span class='basic_left'>C\u00f4ng th\u1ef1c hi\u1ec7n l\u00e0m \u0111\u1ed9ng n\u0103ng c\u1ee7a xe gi\u1ea3m, v\u00ec ma s\u00e1t v\u1edbi phanh \u0111\u00e3 bi\u1ebfn \u0111\u1ed9ng n\u0103ng th\u00e0nh th\u1ebf n\u0103ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2989},{"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 th\u00e1c n\u01b0\u1edbc cao h (m) v\u00e0 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 c\u1ee7a n\u01b0\u1edbc \u1edf \u0111\u1ec9nh v\u00e0 ch\u00e2m th\u00e1c l\u00e0 $0,2{}^\\circ C$. 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 l\u01b0\u1ee3ng truy\u1ec1n cho n\u01b0\u1edbc. Cho bi\u1ebft nhi\u1ec7t dung ri\u00eang c\u1ee7a n\u01b0\u1edbc c=4200J\/kg.K. T\u00ednh \u0111\u1ed9 cao h c\u1ee7a th\u00e1p (Cho bi\u1ebft $g=10m\/{{s}^{2}}$).","select":["A. 100m.","B. 130m.","C. 84m.","D. 126m."],"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 $h=\\dfrac{mC\\Delta t}{mg}=\\dfrac{C\\Delta t}{g}=\\dfrac{4200\\times 0,2}{10}=84m$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2990},{"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 mi\u1ebfng ch\u00ec kh\u1ed1i l\u01b0\u1ee3ng 2 kg \u0111\u1ee9ng y\u00ean \u1edf v\u1ecb tr\u00ed h = 10m c\u00f3:","select":["A. Th\u1ebf n\u0103ng c\u1ee7a v\u1eadt l\u00e0 200J.","B. C\u01a1 n\u0103ng c\u1ee7a v\u1eadt l\u00e0 200J.","C. C\u1ea3 A v\u00e0 B \u0111\u1ec1u \u0111\u00fang.","D. \u0110\u1ed9ng n\u0103ng c\u1ee7a v\u1eadt l\u00e0 200J."],"hint":"","explain":"<span class='basic_left'>$W={{W}_{t}}=mgh=2\\times 10\\times 10=200J$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2991},{"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":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng:<br\/>N\u0103ng l\u01b0\u1ee3ng kh\u00f4ng m\u1ea5t \u0111i v\u00e0 c\u0169ng kh\u00f4ng t\u1ef1 nhi\u00ean sinh ra ..................","select":["A. N\u00f3 truy\u1ec1n t\u1eeb v\u1eadt n\u00e0y sang v\u1eadt kh\u00e1c (2).","B. C\u00e2u (1) v\u00e0 (2) \u0111\u1ec1u \u0111\u00fang.","C. N\u00f3 ch\u1ec9 chuy\u1ec3n h\u00f3a t\u1eeb d\u1ea1ng n\u00e0y sang d\u1ea1ng kh\u00e1c (1).","D. N\u00f3 gi\u1eef nguy\u00ean kh\u00f4ng trao \u0111\u1ed5i."],"hint":"","explain":"<span class='basic_left'>N\u0103ng l\u01b0\u1ee3ng kh\u00f4ng m\u1ea5t \u0111i v\u00e0 c\u0169ng kh\u00f4ng t\u1ef1 nhi\u00ean sinh ra, n\u00f3 truy\u1ec1n t\u1eeb v\u1eadt n\u00e0y sang v\u1eadt kh\u00e1c v\u00e0 chuy\u1ec3n h\u00f3a t\u1eeb d\u1ea1ng n\u00e0y sang d\u1ea1ng kh\u00e1c. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2992},{"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":"Mi\u1ebfng ch\u00ec r\u01a1i t\u1eeb \u0111\u1ed9 cao 26 m xu\u1ed1ng \u0111\u1ea5t. Gi\u1ea3 thi\u1ebft r\u1eb1ng, khi ch\u1ea1m d\u1ea5t to\u00e0n b\u1ed9 c\u01a1 n\u0103ng bi\u1ebfn th\u00e0nh nhi\u1ec7t n\u0103ng. Cho bi\u1ebft nhi\u1ec7t dung ri\u00eang c\u1ee7a ch\u00ec l\u00e0 130J\/kg.K. Nhi\u1ec7t \u0111\u1ed9 t\u0103ng th\u00eam c\u1ee7a mi\u1ebfng ch\u00ec l\u00e0: (cho $g=10m\/{{s}^{2}}$)","select":["A. $3{}^\\circ C$.","B. $0,2{}^\\circ C$.","C. $0,02{}^\\circ C$.","D. $2{}^\\circ C$."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ed9ng n\u0103ng c\u1ee7a mi\u1ebfng ch\u00ec b\u1eb1ng th\u1ebf n\u0103ng c\u1ee7a n\u00f3 . ${{W}_{d}}={{W}_{t}}=mgh$<br\/>M\u00e0 do to\u00e0n b\u1ed9 \u0111\u1ed9ng n\u0103ng c\u1ee7a mi\u1ebfng ch\u00ec chuy\u1ec3n h\u1ebft th\u00e0nh nhi\u1ec7t l\u01b0\u1ee3ng truy\u1ec1n cho n\u00f3, n\u00ean ta c\u00f3:<br\/>$Q=mC\\Delta t={{W}_{d}}={{W}_{t}}=mgh$ <br\/>V\u1eady $\\Delta t=\\dfrac{mgh}{mC}=\\dfrac{gh}{C}=\\dfrac{26\\times 10}{130}=2{}^\\circ C$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2993},{"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":"\u0110un n\u00f3ng b\u00ecnh n\u01b0\u1edbc c\u00f3 n\u00fat \u0111\u1eady. Sau m\u1ed9t kho\u1ea3ng th\u1eddi gian b\u00fat b\u1ecb \u0111\u1ea9y b\u1eadt ra kh\u1ecfi b\u00ecnh. \u0110\u00f3 l\u00e0 s\u1ef1 bi\u1ebfn \u0111\u1ed5i:","select":["A. C\u01a1 n\u0103ng th\u00e0nh nhi\u1ec7t n\u0103ng.","B. Gi\u1eefa nh\u1eefng d\u1ea1ng kh\u00e1c nhau c\u1ee7a c\u01a1 n\u0103ng.","C. Nhi\u1ec7t n\u0103ng th\u00e0nh c\u01a1 n\u0103ng.","D. T\u1ea5t c\u1ea3 c\u00e1c ph\u01b0\u01a1ng \u00e1n \u0111\u01b0a ra \u0111\u1ec1u sai."],"hint":"","explain":"<span class='basic_left'>\u0110un n\u00f3ng b\u00ecnh n\u01b0\u1edbc c\u00f3 n\u00fat \u0111\u1eady. Sau m\u1ed9t kho\u1ea3ng th\u1eddi gian b\u00fat b\u1ecb \u0111\u1ea9y b\u1eadt ra kh\u1ecfi b\u00ecnh. \u0110\u00f3 l\u00e0 s\u1ef1 bi\u1ebfn \u0111\u1ed5i nhi\u1ec7t n\u0103ng th\u00e0nh c\u01a1 n\u0103ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2994},{"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 \u0111o\u00e0n t\u00e0u khi v\u00e0o ga, ng\u01b0\u1eddi l\u00e1i t\u00e0u phanh l\u1ea1i l\u00e0m cho t\u00e0u chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n r\u1ed3i d\u1eebng h\u1eb3n. N\u0103ng l\u01b0\u1ee3ng \u0111\u00e3 chuy\u1ec3n h\u00f3a nh\u01b0 th\u1ebf n\u00e0o? ","select":["A. S\u1ef1 th\u1ef1c hi\u1ec7n c\u00f4ng l\u00e0m gi\u1ea3m nhi\u1ec7t n\u0103ng.","B. S\u1ef1 th\u1ef1c hi\u1ec7n c\u00f4ng l\u00e0m gi\u1ea3m \u0111\u1ed9ng n\u0103ng c\u1ee7a t\u00e0u.","C. S\u1ef1 th\u1ef1c hi\u1ec7n c\u00f4ng l\u00e0m gi\u1ea3m \u0111\u1ed9ng n\u0103ng c\u1ee7a t\u00e0u \u0111\u1ed3ng th\u1eddi m\u1ed9t ph\u1ea7n n\u0103ng l\u01b0\u1ee3ng \u0111\u00e3 chuy\u1ec3n h\u00f3a th\u00e0nh nhi\u1ec7t n\u0103ng.","D. S\u1ef1 th\u1ef1c hi\u1ec7n c\u00f4ng l\u00e0m t\u0103ng \u0111\u1ed9ng n\u0103ng c\u1ee7a t\u00e0u \u0111\u1ed3ng th\u1eddi m\u1ed9t ph\u1ea7n n\u0103ng l\u01b0\u1ee3ng \u0111\u00e3 chuy\u1ec3n h\u00f3a th\u00e0nh nhi\u1ec7t n\u0103ng."],"hint":"","explain":"<span class='basic_left'>S\u1ef1 th\u1ef1c hi\u1ec7n c\u00f4ng l\u00e0m gi\u1ea3m \u0111\u1ed9ng n\u0103ng c\u1ee7a t\u00e0u \u0111\u1ed3ng th\u1eddi m\u1ed9t ph\u1ea7n n\u0103ng l\u01b0\u1ee3ng \u0111\u00e3 chuy\u1ec3n h\u00f3a th\u00e0nh nhi\u1ec7t n\u0103ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2995},{"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\u01a1 n\u0103ng, nhi\u1ec7t n\u0103ng:","select":["A. Ch\u1ec9 c\u00f3 th\u1ec3 chuy\u1ec3n t\u1eeb d\u1ea1ng n\u00e0y sang d\u1ea1ng kh\u00e1c.","B. Ch\u1ec9 c\u00f3 th\u1ec3 truy\u1ec1n t\u1eeb v\u1eadt n\u00e0y sang v\u1eadt kh\u00e1c.","C. C\u00f3 th\u1ec3 chuy\u1ec3n t\u1eeb d\u1ea1ng n\u00e0y sang d\u1ea1ng kh\u00e1c, truy\u1ec1n t\u1eeb v\u1eadt n\u00e0y sang v\u1eadt kh\u00e1c.","D. C\u1ea3 A,B,C."],"hint":"","explain":"<span class='basic_left'>C\u01a1 n\u0103ng, nhi\u1ec7t n\u0103ng c\u00f3 th\u1ec3 chuy\u1ec3n t\u1eeb d\u1ea1ng n\u00e0y sang d\u1ea1ng kh\u00e1c, truy\u1ec1n t\u1eeb v\u1eadt n\u00e0y sang v\u1eadt kh\u00e1c<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2996},{"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 ph\u00e1t bi\u1ec3u \u0111\u00fang:","select":["A. C\u01a1 n\u0103ng bao g\u1ed3m: \u0111\u1ed9ng n\u0103ng v\u00e0 th\u1ebf n\u0103ng.","B. \u0110\u1ed9ng n\u0103ng v\u00e0 th\u1ebf n\u0103ng kh\u00f4ng th\u1ec3 chuy\u1ec3n h\u00f3a qua l\u1ea1i l\u1eabn nhau.","C. C\u01a1 n\u0103ng v\u00e0 nhi\u1ec7t n\u0103ng ch\u1ec9 c\u00f3 th\u1ec3 truy\u1ec1n t\u1eeb v\u1eadt n\u00e0y sang v\u1eadt kh\u00e1c.","D. C\u01a1 n\u0103ng v\u00e0 nhi\u1ec7t n\u0103ng ch\u1ec9 c\u00f3 th\u1ec3 chuy\u1ec3n h\u00f3a t\u1eeb d\u1ea1ng n\u00e0y sang d\u1ea1ng kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>C\u01a1 n\u0103ng bao g\u1ed3m: \u0111\u1ed9ng n\u0103ng v\u00e0 th\u1ebf n\u0103ng l\u00e0 \u00fd \u0111\u00fang. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2997},{"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":"Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y \u0111\u1ea7y \u0111\u1ee7 nh\u1ea5t v\u1ec1 s\u1ef1 b\u1ea3o to\u00e0n v\u00e0 chuy\u1ec3n h\u00f3a c\u01a1 n\u0103ng?","select":["A. \u0110\u1ed9ng n\u0103ng c\u00f3 th\u1ec3 chuy\u1ec3n h\u00f3a th\u00e0nh c\u01a1 n\u0103ng.","B. Th\u1ebf n\u0103ng c\u00f3 th\u1ec3 chuy\u1ec3n h\u00f3a th\u00e0nh \u0111\u1ed9ng n\u0103ng.","C. \u0110\u1ed9ng n\u0103ng v\u00e0 th\u1ebf n\u0103ng c\u00f3 th\u1ec3 chuy\u1ec3n h\u00f3a qua l\u1ea1i l\u1ea7n nhau nh\u01b0ng c\u01a1 n\u0103ng \u0111\u01b0\u1ee3c b\u1ea3o to\u00e0n.","D. \u0110\u1ed9ng n\u0103ng ch\u1ec9 c\u00f3 th\u1ec3 chuy\u1ec3n h\u00f3a th\u00e0nh th\u1ebf n\u0103ng."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ed9ng n\u0103ng v\u00e0 th\u1ebf n\u0103ng c\u00f3 th\u1ec3 chuy\u1ec3n h\u00f3a qua l\u1ea1i l\u1ea7n nhau nh\u01b0ng c\u01a1 n\u0103ng \u0111\u01b0\u1ee3c b\u1ea3o to\u00e0n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2998},{"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":"Quan s\u00e1t tr\u01b0\u1eddng h\u1ee3p qu\u1ea3 b\u00f3ng r\u01a1i ch\u1ea1m \u0111\u1ea5t n\u00f3 n\u1ea3y l\u00ean. Trong qu\u00e1 tr\u00ecnh n\u00f3 n\u1ea3y l\u00ean th\u00ec th\u1ebf n\u0103ng v\u00e0 \u0111\u1ed9ng n\u0103ng thay \u0111\u1ed5i nh\u01b0 th\u1ebf n\u00e0o?","select":["A. \u0110\u1ed9ng n\u0103ng t\u0103ng, th\u1ebf n\u0103ng gi\u1ea3m.","B. \u0110\u1ed9ng n\u0103ng v\u00e0 th\u1ebf n\u0103ng \u0111\u1ec1u t\u0103ng.","C. \u0110\u1ed9ng n\u0103ng v\u00e0 th\u1ebf n\u0103ng \u0111\u1ec1u gi\u1ea3m.","D. \u0110\u1ed9ng n\u0103ng gi\u1ea3m, th\u1ebf n\u0103ng t\u0103ng."],"hint":"","explain":"<span class='basic_left'>Trong qu\u00e1 tr\u00ecnh n\u00f3 n\u1ea3y l\u00ean th\u00ec \u0111\u1ed9ng n\u0103ng gi\u1ea3m, th\u1ebf n\u0103ng t\u0103ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2999}],"lesson":{"save":0,"level":2}}