{"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":"\u0110\u1ec3 nh\u1eadn bi\u1ebft \u00f4 t\u00f4 chuy\u1ec3n \u0111\u1ed9ng tr\u00ean \u0111\u01b0\u1eddng, c\u00f3 th\u1ec3 ch\u1ecdn c\u00e1ch n\u00e0o sau? ","select":["A. Quan s\u00e1t b\u00e1nh xe \u00f4 t\u00f4 xem c\u00f3 quay kh\u00f4ng.","B. Quan s\u00e1t ng\u01b0\u1eddi l\u00e1i xe c\u00f3 trong xe kh\u00f4ng.","C. Ch\u1ecdn m\u1ed9t v\u1eadt c\u1ed1 \u0111\u1ecbnh tr\u00ean m\u1eb7t \u0111\u01b0\u1eddng l\u00e0m m\u1ed1c, r\u1ed3i ki\u1ec3m tra xem v\u1ecb tr\u00ed c\u1ee7a \u00f4 t\u00f4 c\u00f3 thay \u0111\u1ed5i so v\u1edbi m\u1ed1c \u0111\u00f3 hay kh\u00f4ng?","D. Quan s\u00e1t s\u1ed1 ch\u1ec9 c\u1ee7a c\u00f4ng t\u01a1 m\u00e9t xem kim c\u00f3 ch\u1ec9 m\u1ed9t s\u1ed1 n\u00e0o kh\u00f4ng?"],"hint":"","explain":"<span class='basic_left'>\u0110\u1ec3 nh\u1eadn bi\u1ebft \u00f4 t\u00f4 chuy\u1ec3n \u0111\u1ed9ng tr\u00ean \u0111\u01b0\u1eddng ch\u1ecdn m\u1ed9t v\u1eadt c\u1ed1 \u0111\u1ecbnh tr\u00ean m\u1eb7t \u0111\u01b0\u1eddng l\u00e0m m\u1ed1c, r\u1ed3i ki\u1ec3m tra xem v\u1ecb tr\u00ed c\u1ee7a \u00f4 t\u00f4 c\u00f3 thay \u0111\u1ed5i so v\u1edbi m\u1ed1c \u0111\u00f3 hay kh\u00f4ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2780},{"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 kh\u1eb3ng \u0111\u1ecbnh sau, kh\u1eb3ng \u0111\u1ecbnh n\u00e0o \u0111\u00fang?","select":["A. \u00d4 t\u00f4 chuy\u1ec3n \u0111\u1ed9ng tr\u00ean \u0111\u01b0\u1eddng, v\u1eadt l\u00e0m m\u1ed1c l\u00e0 ng\u01b0\u1eddi l\u00e1i xe","B. Chi\u1ebfc thuy\u1ec1n chuy\u1ec3n \u0111\u1ed9ng tr\u00ean s\u00f4ng, v\u1eadt l\u00e0m m\u1ed1c l\u00e0 ng\u01b0\u1eddi l\u00e1i thuy\u1ec1n.","C. T\u00e0u h\u1ecfa r\u1eddi ga \u0111ang chuy\u1ec3n \u0111\u1ed9ng tr\u00ean \u0111\u01b0\u1eddng s\u1eaft v\u1eadt m\u1ed1c l\u00e0 \u0111\u01b0\u1eddng ray xe.","D. Qu\u1ea3 b\u00f3ng r\u01a1i t\u1eeb tr\u00ean cao xu\u1ed1ng \u0111\u1ea5t, v\u1eadt m\u1ed1c l\u00e0 m\u1eb7t \u0111\u1ea5t."],"hint":"","explain":"<span class='basic_left'>\u00d4 t\u00f4 chuy\u1ec3n \u0111\u1ed9ng tr\u00ean \u0111\u01b0\u1eddng, v\u1eadt l\u00e0m m\u1ed1c l\u00e0 <b> c\u00e2y b\u00ean \u0111\u01b0\u1eddng<\/b><br\/>Chi\u1ebfc thuy\u1ec1n chuy\u1ec3n \u0111\u1ed9ng tr\u00ean s\u00f4ng, v\u1eadt l\u00e0m m\u1ed1c l\u00e0 <b> b\u1edd s\u00f4ng<\/b><br\/>T\u00e0u h\u1ecfa r\u1eddi ga \u0111ang chuy\u1ec3n \u0111\u1ed9ng tr\u00ean \u0111\u01b0\u1eddng s\u1eaft v\u1eadt m\u1ed1c l\u00e0 <b> nh\u00e0 ga<\/b><br\/><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2781},{"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 m\u1ed9t m\u00e1y b\u01a1m \u0111\u1ec3 b\u01a1m $20{{m}^{3}}$ n\u01b0\u1edbc l\u00ean \u0111\u1ed9 cao $5m$, bi\u1ebft hi\u1ec7u su\u1ea5t c\u1ee7a m\u00e1y b\u01a1m l\u00e0 $80\\%$ v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 $1kg\/d{{m}^{3}}$. H\u1ecfi c\u00f4ng do m\u00e1y b\u01a1m s\u1ea3n xu\u1ea5t ra l\u00e0 bao nhi\u00eau?","select":["A. $A = 1250000J$.","B. $A = 125000J$.","C. $A = 12500J$.","D. $A = 1250J$."],"hint":"\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c: $A=\\dfrac{F}{s}$","explain":"<span class='basic_left'>C\u00f4ng \u0111\u01b0a n\u01b0\u1edbc l\u00ean l\u00e0:<br\/>${{A}_{ci}}=20\\times {{10}^{3}}\\times 10\\times 5={{10}^{6}}J$ <br\/>C\u00f4ng m\u00e1y b\u01a1m s\u1ea3n ra l\u00e0:<br\/>${{A}_{tp}}=\\dfrac{{{A}_{ci}}}{H}=\\dfrac{{{10}^{6}}}{80\\%}=1250000J$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2782},{"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 \u0111o\u00e0n t\u00e0u chuy\u1ec3n \u0111\u1ed9ng trong th\u1eddi gian $1,5$ gi\u1edd \u0111i \u0111o\u1ea1n \u0111\u01b0\u1eddng d\u00e0i $81\\,000m$. V\u1eadn t\u1ed1c c\u1ee7a t\u00e0u t\u00ednh ra $km\/h$ v\u00e0 $m\/s$ l\u00e0 gi\u00e1 tr\u1ecb n\u00e0o trong c\u00e1c gi\u00e1 tr\u1ecb sau?","select":["A. $54km\/h$ v\u00e0 $10m\/s$.","B. $10km\/h$ v\u00e0 $54m\/s$.","C. $15km\/h$ v\u00e0 $54m\/s$.","D. $54km\/h$ v\u00e0 $15m\/s$."],"hint":"\u00c1p d\u1ee5ng $v=\\dfrac{s}{t}$","explain":"<span class='basic_left'>$v=\\dfrac{81000}{1,5}=54000m\/h=54km\/h=15m\/s$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2783},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"M\u1ed9t v\u1eadt chuy\u1ec3n \u0111\u1ed9ng kh\u00f4ng \u0111\u1ec1u v\u1edbi v\u1eadn t\u1ed1c t\u0103ng d\u1ea7n theo quy lu\u1eadt $V = 4t$ (\u0111\u01a1n v\u1ecb $m\/s$) ($t$ l\u00e0 th\u1eddi gian t\u00ednh b\u1eb1ng gi\u00e2y). V\u1eadn t\u1ed1c c\u1ee7a v\u1eadt sau $12$ gi\u00e2y k\u1ec3 t\u1eeb l\u00fac chuy\u1ec3n \u0111\u1ed9ng l\u00e0:","select":["A. $4,8m\/s$.","B. $48m\/s$.","C. $0,48m\/s$.","D. M\u1ed9t gi\u00e1 tr\u1ecb kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>V\u1eadn t\u1ed1c c\u1ee7a v\u1eadt sau $12$ gi\u00e2y l\u00e0: $V=4t=4\\times 12=48m\/s$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2784},{"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\/>Khi th\u1ea3 v\u1eadt r\u01a1i, do s\u1ee9c ....(1).... v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt ....(2).... Khi qu\u1ea3 b\u00f3ng l\u0103n v\u00e0o b\u00e3i c\u00e1t, do ....(3)..... c\u1ee7a c\u00e1t n\u00ean v\u1eadn t\u1ed1c c\u1ee7a qu\u1ea3 b\u00f3ng b\u1ecb ....(4)....","select":["A. (1) h\u00fat c\u1ee7a Tr\u00e1i \u0110\u1ea5t, (2) gi\u1ea3m, (3) t\u0103ng, (4) l\u1ef1c c\u1ea3n.","B. (1) h\u00fat c\u1ee7a Tr\u00e1i \u0110\u1ea5t, (2) t\u0103ng, (3) gi\u1ea3m, (4) l\u1ef1c c\u1ea3n.","C. (1) h\u00fat c\u1ee7a Tr\u00e1i \u0110\u1ea5t, (2) l\u1ef1c c\u1ea3n, (3) t\u0103ng, (4) gi\u1ea3m.","D. (1) h\u00fat c\u1ee7a Tr\u00e1i \u0110\u1ea5t, (2) t\u0103ng, (3) l\u1ef1c c\u1ea3n, (4) gi\u1ea3m."],"hint":"","explain":"<span class='basic_left'>Khi th\u1ea3 v\u1eadt r\u01a1i, do s\u1ee9c h\u00fat c\u1ee7a Tr\u00e1i \u0110\u1ea5t v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt t\u0103ng. Khi qu\u1ea3 b\u00f3ng l\u0103n v\u00e0o b\u00e3i c\u00e1t, do l\u1ef1c c\u1ea3n c\u1ee7a c\u00e1t n\u00ean v\u1eadn t\u1ed1c c\u1ee7a qu\u1ea3 b\u00f3ng b\u1ecb gi\u1ea3m. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2785},{"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 qu\u1ea3 d\u1eeba n\u1eb7ng 1,5 kg r\u01a1i t\u1eeb \u0111\u1ed9 cao 4m xu\u1ed1ng m\u1eb7t \u0111\u1ea5t. T\u00ednh c\u00f4ng c\u1ee7a tr\u1ecdng l\u1ef1c.","select":["A. 3J","B. 6J","C. 60J","D. 15J"],"hint":"","explain":"<span class='basic_left'>Tr\u1ecdng l\u1ef1c c\u1ee7a qu\u1ea3 d\u1eeba l\u00e0: $P=1,5.10=15N$<br\/>C\u00f4ng c\u1ee7a tr\u1ecdng l\u1ef1c l\u00e0: $A=P.h=15.4=60J$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2786},{"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\u00f3c l\u1ef1c k\u1ebf v\u00e0o v\u1eadt n\u1eb1m tr\u00ean b\u00e0n r\u1ed3i k\u00e9o l\u1ef1c k\u1ebf theo ph\u01b0\u01a1ng ngang. V\u1eadt ch\u01b0a chuy\u1ec3n \u0111\u1ed9ng l\u1ef1c k\u1ebf \u0111\u00e3 ch\u1ec9 m\u1ed9t gi\u00e1 tr\u1ecb n\u00e0o \u0111\u00f3. T\u1ea1i sao c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean v\u1eadt m\u00e0 v\u1eadt v\u1eabn \u0111\u1ee9ng y\u00ean?","select":["A. Gi\u1eefa v\u1eadt v\u00e0 m\u1eb7t s\u00e0n c\u00f3 ma s\u00e1t ngh\u1ec9.","B. Gi\u1eefa v\u1eadt v\u00e0 m\u1eb7t s\u00e0n c\u00f3 ma s\u00e1t l\u0103n.","C. Gi\u1eefa v\u1eadt v\u00e0 m\u1eb7t s\u00e0n c\u00f3 ma s\u00e1t tr\u01b0\u1ee3t.","D. V\u00ec v\u1eadt qu\u00e1 n\u1eb7ng."],"hint":"","explain":"<span class='basic_left'>Gi\u1eefa v\u1eadt v\u00e0 m\u1eb7t s\u00e0n c\u00f3 ma s\u00e1t ngh\u1ec9 v\u00e0 l\u1ef1c k\u00e9o ch\u01b0a \u0111\u1ee7 l\u1edbn h\u01a1n l\u1ef1c ma s\u00e1t ngh\u1ec9 n\u00ean v\u1eadt ch\u01b0a th\u1ec3 chuy\u1ec3n \u0111\u1ed9ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2787},{"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 xe t\u1ea3i kh\u1ed1i l\u01b0\u1ee3ng $8$ t\u1ea5n, c\u00f3 $6$ b\u00e1nh xe, di\u1ec7n t\u00edch ti\u1ebfp x\u00fac c\u1ee7a m\u1ed7i b\u00e1nh v\u1edbi m\u1eb7t \u0111\u01b0\u1eddng l\u00e0 $7,5c{{m}^{2}}$. Coi m\u1eb7t \u0111\u01b0\u1eddng l\u00e0 b\u1eb1ng ph\u1eb3ng. \u00c1p su\u1ea5t c\u1ee7a xe l\u00ean m\u1eb7t \u0111\u01b0\u1eddng khi xe \u0111\u1ee9ng y\u00ean l\u00e0 bao nhi\u00eau? ","select":["A. $1777777,8 N\/{{m}^{2}}$.","B. $17777777,8 N\/{{m}^{2}}$.","C. $177777,8 N\/{{m}^{2}}$.","D. $17777,8 N\/{{m}^{2}}$."],"hint":"","explain":"<span class='basic_left'>\u00c1p su\u1ea5t c\u1ee7a xe l\u00ean m\u1eb7t \u0111\u01b0\u1eddng khi xe \u0111\u1ee9ng y\u00ean l\u00e0:<br\/>$p=\\dfrac{8\\times {{10}^{3}}\\times 10}{6\\times 7,5\\times {{10}^{-4}}}=17777777,8N\/{{m}^{2}}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2788},{"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 m\u1ed9t c\u00e1i \u0111\u1ed9t \u0111\u1ec3 \u0111\u1ee5c l\u1ed7 tr\u00ean m\u1ed9t t\u1ea5m t\u00f4n m\u1ecfng. M\u0169i \u0111\u1ed9t c\u00f3 di\u1ec7n t\u00edch $S = 0,0000004{{m}^{2}}$, \u00e1p l\u1ef1c b\u00faa \u0111\u1eadp v\u00e0o \u0111\u1ed9t l\u00e0 $60N$, \u00e1p su\u1ea5t do m\u0169i \u0111\u1ed9t t\u00e1c d\u1ee5ng l\u00ean t\u1ea5m t\u00f4n c\u00f3 th\u1ec3 nh\u1eadn gi\u00e1 tr\u1ecb n\u00e0o sau: ","select":["A. $p = 15000000 N\/{{m}^{2}}$.","B. $p = 150000000 N\/{{m}^{2}}$.","C. $p = 1500000000 N\/{{m}^{2}}$.","D. M\u1ed9t gi\u00e1 tr\u1ecb kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>$p=\\dfrac{60}{0,0000004}=150000000N\/{{m}^{2}}$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2789},{"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\u1ed5 m\u1ed9t l\u01b0\u1ee3ng n\u01b0\u1edbc v\u00e0o trong c\u1ed1c sao cho \u0111\u1ed9 cao n\u01b0\u1edbc trong c\u1ed1c l\u00e0 $12cm$. \u00c1p su\u1ea5t n\u01b0\u1edbc l\u00ean m\u1ed9t \u0111i\u1ec3m $A$ c\u00e1ch \u0111\u00e1y c\u1ed1c $4cm$ l\u00e0 bao nhi\u00eau? Bi\u1ebft tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang n\u01b0\u1edbc l\u00e0 $10 000 N\/{{m}^{3}}$. ","select":["A. $600 N\/{{m}^{3}}$.","B. $1000 N\/{{m}^{3}}$.","C. $800 N\/{{m}^{3}}$.","D. $1200 N\/{{m}^{3}}$."],"hint":"","explain":"<span class='basic_left'>Chi\u1ec1u cao c\u1ee7a n\u01b0\u1edbc t\u1eeb \u0111i\u1ec3m \u0111\u00f3 \u0111\u1ebfn m\u1eb7t tho\u00e1ng l\u00e0: $h=8cm$<br\/>V\u1eady \u00e1p su\u1ea5t $p=800 N\/{{m}^{3}}$.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2790},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Trong ph\u00e9p bi\u1ebfn \u0111\u1ed5i sau, ph\u00e9p bi\u1ebfn \u0111\u1ed5i n\u00e0o l\u00e0 sai?","select":["A. $760 mmHg = 103360 N\/{{m}^{2}}$.","B. $750 mmHg = 10336 N\/{{m}^{2}}$.","C. $100640 N\/{{m}^{2}} = 74 cmHg$.","D. $700 mmHg = 95200 N\/{{m}^{2}}$."],"hint":"","explain":"<span class='basic_left'>Bi\u1ebfn \u0111\u1ed5i \u0111\u00fang l\u00e0: $750 mmHg = 102000 N\/{{m}^{2}}$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2791},{"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 kh\u00ed \u00e1p k\u1ebf \u0111\u1eb7t \u1edf \u0111i\u1ec3m cao nh\u1ea5t c\u1ee7a tr\u1ee5 \u0103ng ten, n\u00f3 ch\u1ec9 $738mmHg$. \u0110\u1ed9 cao c\u1ee7a tr\u1ee5 \u0103ng ten l\u00e0 bao nhi\u00eau?","select":["A. $125,54m$.","B. $129,54m$.","C. $127,54m$.","D. M\u1ed9t gi\u00e1 tr\u1ecb kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ed9 cao c\u1ee7a c\u1ed9t th\u1ee7y ng\u00e2n l\u00e0:<br\/>$\\dfrac{750-738}{1000}=0,012m$<br\/>M\u00e0 ta l\u1ea1i c\u00f3:<br\/>${{d}_{kk\\times }}{{h}_{kk}}={{d}_{Hg}}\\times {{h}_{Hg}}$<br\/> $\\Rightarrow {{h}_{kk}}=\\dfrac{{{d}_{Hg}}\\times{{h}_{Hg}}}{{{d}_{kk}}}=\\dfrac{136000\\times 0,012}{13}=125,54m$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2792},{"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":"Treo m\u1ed9t v\u1eadt nh\u1ecf v\u00e0o m\u1ed9t l\u1ef1c k\u1ebf v\u00e0 \u0111\u1eb7t ch\u00fang trong kh\u00f4ng kh\u00ed th\u1ea5y l\u1ef1c k\u1ebf ch\u1ec9 $F = 12N$, nh\u01b0ng khi nh\u00fang ch\u00ecm ho\u00e0n to\u00e0n v\u1eadt trong n\u01b0\u1edbc th\u00ec l\u1ef1c k\u1ebf ch\u1ec9 $F'=7N$. Cho kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang n\u01b0\u1edbc l\u00e0 $1000kg\/{{m}^{2}}$. Th\u1ec3 t\u00edch c\u1ee7a v\u1eadt v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u00f3 l\u00e0 bao nhi\u00eau ?","select":["A. $V = 0,0005 {{m}^{3}}$ v\u00e0 $d = 24.000 N\/{{m}^{3}}$.","B. $V = 0,005 {{m}^{3}}$ v\u00e0 $d = 2.400 N\/{{m}^{3}}$.","C. $V = 0,00005 {{m}^{3}}$ v\u00e0 $d = 24.000 N\/{{m}^{3}}$.","D. M\u1ed9t gi\u00e1 c\u1eb7p tr\u1ecb kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>Th\u1ec3 t\u00edch c\u1ee7a v\u1eadt:<br\/>$V=\\dfrac{F-{{F}^{'}}}{{{d}_{nc}}}=\\dfrac{12-7}{10\\times 1000}=5\\times {{10}^{-4}}{{m}^{3}}$ <br\/>Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a v\u1eadt l\u00e0: <br\/>$D=\\dfrac{F}{V}=\\dfrac{12}{5\\times {{10}^{-4}}}=24000N\/{{m}^{3}}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2793},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"M\u1ed9t v\u1eadt c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng $598,5g$ l\u00e0m b\u1eb1ng ch\u1ea5t c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang $D = 10,5g\/{{m}^{3}}$ \u0111\u01b0\u1ee3c nh\u00fang ho\u00e0n to\u00e0n trong n\u01b0\u1edbc. Cho tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 $d=10.000N\/{{m}^{3}}$. L\u1ef1c \u0111\u1ea9y Ac-si-m\u00e9t l\u00e0 bao nhi\u00eau ? ","select":["A. $0,37N$.","B. $0,57N$.","C. $0,47N$.","D. $0,67N$."],"hint":"","explain":"<span class='basic_left'>Th\u1ec3 t\u00edch c\u1ee7a v\u1eadt l\u00e0: $V=\\dfrac{598,5}{10,5}=57c{{m}^{3}}$ <br\/>\u0110\u1ed5i: $57c{{m}^{3}}=0,000057{{m}^{3}}$ <br\/>L\u1ef1c \u0111\u1ea9y Ac-si-m\u00e9t l\u00e0 : ${{F}_{A}}=10000\\times 0,000057=0,57N$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2794},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"M\u1ed9t v\u1eadt kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang $400kg\/{{m}^{3}}$ th\u1ea3 trong c\u1ed1c n\u01b0\u1edbc c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang $1000kg\/{{m}^{3}}$. H\u1ecfi v\u1eadt ch\u00ecm bao nhi\u00eau ph\u1ea7n tr\u0103m th\u1ec3 t\u00edch c\u1ee7a n\u00f3 trong n\u01b0\u1edbc ? ","select":["A. $30\\%$.","B. $40\\%$.","C. $35\\%$.","D. $45\\%$."],"hint":"","explain":"<span class='basic_left'>Th\u1ec3 t\u00edch c\u1ee7a v\u1eadt l\u00e0 $V$<br\/>Th\u1ec3 t\u00edch ch\u00ecm l\u00e0 ${{V}_{c}}$<br\/> L\u1ef1c \u0111\u1ea9y Acsimet l\u00e0: ${{F}_{A}}={{V}_{c}}\\times {{D}_{nc}}$ <br\/>V\u00ec v\u1eadt n\u1ed5i n\u00ean: ${{F}_{A}}=P=V\\times {{D}_{v}}$ <br\/>$\\Rightarrow V\\times {{D}_{v}}={{V}_{c}}\\times {{D}_{nc}}$ <br\/>$\\Rightarrow \\dfrac{{{V}_{c}}}{V}=\\dfrac{{{D}_{v}}}{{{D}_{nc}}}=\\dfrac{400}{1000}=40\\%$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2795},{"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 c\u1ee5c n\u01b0\u1edbc \u0111\u00e1 c\u00f3 th\u1ec3 t\u00edch $V = 500c{{m}^{3}}$ n\u1ed5i tr\u00ean m\u1eb7t n\u01b0\u1edbc. Bi\u1ebft kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc \u0111\u00e1 l\u00e0 $0,92g\/{{m}^{3}}$, tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang n\u01b0\u1edbc l\u00e0 $10000N\/{{m}^{3}}$. H\u1ecfi th\u1ec3 t\u00edch c\u1ee7a ph\u1ea7n n\u01b0\u1edbc \u0111\u00e1 l\u00f3 ra kh\u1ecfi m\u1eb7t n\u01b0\u1edbc l\u00e0 bao nhi\u00eau ? ","select":["A. $30c{{m}^{3}}$.","B. $50c{{m}^{3}}$.","C. $40c{{m}^{3}}$.","D. $60c{{m}^{3}}$."],"hint":"","explain":"<span class='basic_left'>\u0110\u1ed5i $0,92g\/{{m}^{3}} = 9200 N\/{{m}^{3}}$<br\/>T\u01b0\u01a1ng t\u1ef1 c\u00e2u 16, ph\u1ea7n tr\u0103m \u0111\u00e1 ch\u00ecm trong n\u01b0\u1edbc l\u00e0:<br\/>$\\dfrac{9200}{10000}=92\\%$ <br\/>Th\u1ec3 t\u00edch \u0111\u00e1 nh\u00f4 ra l\u00e0:<br\/>${{V}^{'}}=V\\times 8\\%=500\\times 8\\%=40c{{m}^{3}}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2796},{"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 qu\u1ea3 d\u1eeba c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng $25N$ r\u01a1i t\u1eeb tr\u00ean c\u00e2y c\u00e1ch m\u1eb7t \u0111\u1ea5t $8m$. C\u00f4ng c\u1ee7a tr\u1ecdng l\u1ef1c l\u00e0 bao nhi\u00eau?","select":["A. $A = 1600J$.","B. $A =200J$.","C. $A = 180J$.","D. $A = 220J$."],"hint":"","explain":"<span class='basic_left'>$A=P\\times h=25\\times 8=200J$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2797},{"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 con ng\u1ef1a k\u00e9o xe chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u v\u1edbi l\u1ef1c k\u00e9o $600N$. Trong $5$ ph\u00fat c\u00f4ng th\u1ef1c hi\u1ec7n l\u00e0 $360kJ$. V\u1eadn t\u1ed1c c\u1ee7a xe l\u00e0 bao nhi\u00eau? ","select":["A. $v = 1,8m\/s$.","B. $v = 2,2m\/s$.","C. $v = 2m\/s$.","D. M\u1ed9t gi\u00e1 tr\u1ecb kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>$v=\\dfrac{P}{F}=\\dfrac{A}{t.F}=\\dfrac{360000}{600\\times 5\\times 60}=2m\/s$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2798},{"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 m\u00e1y b\u01a1m b\u01a1m n\u01b0\u1edbc l\u00ean cao $5,5m$. Trong m\u1ed7i gi\u00e2y m\u00e1y sinh c\u00f4ng $7500J$. H\u1ecfi m\u00e1y ho\u1ea1t \u0111\u1ed9ng li\u00ean t\u1ee5c trong $1$ gi\u1edd, th\u1ec3 t\u00edch n\u01b0\u1edbc m\u00e0 m\u00e1y b\u01a1m chuy\u1ec3n \u0111\u01b0\u1ee3c l\u00ean cao l\u00e0 bao nhi\u00eau ?","select":["A. $V = 49,9{{m}^{3}}$.","B. $V = 490,9{{m}^{3}}$.","C. $V = 4900,9c{{m}^{3}}$.","D. $V = 49000,9c{{m}^{3}}$."],"hint":"","explain":"<span class='basic_left'>Kh\u1ed1i l\u01b0\u1ee3ng n\u01b0\u1edbc sinh ra trong $1$ gi\u1edd:<br\/>$m=\\dfrac{7500\\times 3600}{5,5\\times 10}=$490909kg<br\/>Th\u1ec3 t\u00edch n\u01b0\u1edbc:<br\/>$V=\\dfrac{m}{D}=\\dfrac{490090}{1000}=490{{m}^{3}}$<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2799}],"lesson":{"save":0,"level":2}}