{"segment":[{"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":"Khi v\u1eadt n\u1ed5i tr\u00ean ch\u1ea5t l\u1ecfng th\u00ec l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t c\u00f3 c\u01b0\u1eddng \u0111\u1ed9?","select":["A. B\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a ph\u1ea7n v\u1eadt ch\u00ecm trong n\u01b0\u1edbc.","B. B\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a ph\u1ea7n n\u01b0\u1edbc b\u1ecb v\u1eadt chi\u1ebfm ch\u1ed7.","C. B\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt.","D. B\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc nh\u00e2n v\u1edbi th\u1ec3 t\u00edch c\u1ee7a v\u1eadt."],"hint":"","explain":"<span class='basic_left'>Khi v\u1eadt n\u1ed5i tr\u00ean ch\u1ea5t l\u1ecfng th\u00ec l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 b\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc nh\u00e2n v\u1edbi th\u1ec3 t\u00edch c\u1ee7a v\u1eadt. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2660},{"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 chi\u1ebfc x\u00e0 lan c\u00f3 d\u1ea1ng h\u00ecnh h\u1ed9p d\u00e0i 4m, r\u1ed9ng 2m. Bi\u1ebft x\u00e0 lan ng\u1eadp s\u00e2u trong n\u01b0\u1edbc 0,5m. Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 10000N\/${{m}^{3}}$. X\u00e0 lan c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng l\u00e0 bao nhi\u00eau?","select":["A. P = 40000N.","B. P = 45000N.","C. P = 50000N.","D. M\u1ed9t k\u1ebft qu\u1ea3 kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>Th\u1ec3 t\u00edch x\u00e0 lan ch\u00ecm trong n\u01b0\u1edbc : $V=4\\times 2\\times 0,5=4{{m}^{3}}$ <br\/>L\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t t\u00e1c d\u1ee5ng l\u00ean x\u00e0 lan:${{F}_{A}}=d\\times V=10000\\times 4=40000N$ <br\/>Do x\u00e0 lan n\u1ed5i tr\u00ean n\u01b0\u1edbc n\u00ean tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a x\u00e0 lan l\u00e0:<br\/>${{F}_{A}}$ = P = 40000N <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2661},{"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 v\u1eadt n\u1ed5i tr\u00ean m\u1eb7t ch\u1ea5t l\u1ecfng th\u00ec nh\u1eadn x\u00e9t n\u00e0o d\u01b0\u1edbi \u0111\u00e2y \u0111\u00fang?","select":["A. L\u1ef1c \u0111\u1ea9y \u00c1csim\u00e9t nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt.","B. L\u1ef1c \u0111\u1ea9y \u00c1csim\u00e9t b\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a ph\u1ea7n v\u1eadt ch\u00ecm trong n\u01b0\u1edbc.","C. L\u1ef1c \u0111\u1ea9y \u00c1csim\u00e9t b\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt.","D. L\u1ef1c \u0111\u1ea9y \u00c1csim\u00e9t l\u1edbn h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt."],"hint":"","explain":"<span class='basic_left'>Khi v\u1eadt n\u1ed5i tr\u00ean m\u1eb7t ch\u1ea5t l\u1ecfng th\u00ec ${{F}_{A}}$ = P.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2662},{"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 n\u1eb1m trong m\u1ed9t ch\u1ea5t l\u1ecfng. Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang nh\u1ea5t khi n\u00f3i v\u1ec1 c\u00e1c l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean v\u1eadt?","select":["A. V\u1eadt n\u1eb1m trong ch\u1ea5t l\u1ecfng ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a m\u1ed9t l\u1ef1c \u0111\u1ea9y duy nh\u1ea5t l\u00e0 l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t.","B. V\u1eadt n\u1eb1m trong ch\u1ea5t l\u1ecfng ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a tr\u1ecdng l\u1ef1c P v\u00e0 l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t, hai l\u1ef1c n\u00e0y \u0111\u1ec1u c\u00f3 ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng. Tr\u1ecdng l\u1ef1c c\u00f3 chi\u1ec1u t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi c\u00f2n l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t c\u00f3 chi\u1ec1u t\u1eeb d\u01b0\u1edbi l\u00ean tr\u00ean.","C. V\u1eadt n\u1eb1m trong ch\u1ea5t l\u1ecfng ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a tr\u1ecdng l\u1ef1c P v\u00e0 l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t, hai l\u1ef1c n\u00e0y \u0111\u1ec1u c\u00f3 ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng v\u00e0 c\u00f9ng chi\u1ec1u t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi.","D. V\u1eadt n\u1eb1m trong ch\u1ea5t l\u1ecfng ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a m\u1ed9t l\u1ef1c duy nh\u1ea5t l\u00e0 tr\u1ecdng l\u1ef1c P."],"hint":"","explain":"<span class='basic_left'>V\u1eadt n\u1eb1m trong ch\u1ea5t l\u1ecfng ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a tr\u1ecdng l\u1ef1c P v\u00e0 l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t, hai l\u1ef1c n\u00e0y \u0111\u1ec1u c\u00f3 ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng. Tr\u1ecdng l\u1ef1c c\u00f3 chi\u1ec1u t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi c\u00f2n l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t c\u00f3 chi\u1ec1u t\u1eeb d\u01b0\u1edbi l\u00ean tr\u00ean.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2663},{"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":"N\u1ebfu g\u1ecdi P l\u00e0 tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt, g\u1ecdi F l\u00e0 l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t t\u00e1c d\u1ee5ng l\u00ean v\u1eadt khi v\u1eadt \u0111\u01b0\u1ee3c nh\u00fang ho\u00e0n to\u00e0n trong ch\u1ea5t l\u1ecfng. \u0110i\u1ec1u ki\u1ec7n n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang cho tr\u01b0\u1eddng h\u1ee3p v\u1eadt n\u1ed5i tr\u00ean b\u1ec1 m\u1eb7t ch\u1ea5t l\u1ecfng?","select":["A. P \u2265 F.","B. P = F.","C. P < F.","D. P > F."],"hint":"","explain":"<span class='basic_left'>Ch\u00fa \u00fd: F \u0111\u01b0\u1ee3c l\u1ea5y l\u00e0 l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t t\u00e1c d\u1ee5ng l\u00ean v\u1eadt khi v\u1eadt \u0111\u01b0\u1ee3c nh\u00fang ho\u00e0n to\u00e0n trong ch\u1ea5t l\u1ecfng.<br\/>V\u1eady n\u1ebfu v\u1eadt n\u1ed5i l\u00ean tr\u00ean ch\u1ea5t l\u1ecfng th\u00ec th\u1ec3 t\u00edch ph\u1ea7n ch\u1ea5t l\u1ecfng b\u1ecb chi\u1ebfm s\u1ebd nh\u1ecf h\u01a1n t\u1ed5ng th\u1ec3 t\u00edch c\u1ee7a v\u1eadt, khi \u0111\u00f3 ${{F}_{A}}$<F.<br\/>M\u00e0 ta c\u00f3 v\u1eadt n\u1ed5i tr\u00ean b\u1ec1 m\u1eb7t ch\u1ea5t l\u1ecfng th\u00ec P=${{F}_{A}}$.<br\/>V\u1eady P < F.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2664},{"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 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang l\u00e0 26000N\/${{m}^{3}}$. Treo v\u1eadt v\u00e0o m\u1ed9t k\u1ebf r\u1ed3i nh\u00fang v\u1eadt ng\u1eadp trong n\u01b0\u1edbc th\u00ec l\u1ef1c k\u1ebf ch\u1ec9 150N. H\u1ecfi n\u1ebfu treo v\u1eadt ngo\u00e0i kh\u00f4ng kh\u00ed th\u00ec l\u1ef1c k\u1ebf ch\u1ec9 bao nhi\u00eau ? Cho bi\u1ebft tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 10000N\/${{m}^{3}}$.","select":["A. 211,5N.","B. 243,75N.","C. 345N.","D. 322,2N."],"hint":"","explain":"<span class='basic_left'>${{F}_{A}}=P-{{P}_{n}}$ => ${{d}_{n}}\\times V=d\\times V-{{P}_{n}}$<br\/>V\u1edbi P l\u00e0 s\u1ed1 ch\u1ec9 c\u1ee7a l\u1ef1c k\u1ebf khi treo v\u1eadt v\u00e0o l\u1ef1c k\u1ebf \u1edf ngo\u00e0i kh\u00f4ng kh\u00ed. <br\/>Pn l\u00e0 s\u1ed1 ch\u1ec9 c\u1ee7a l\u1ef1c k\u1ebf khi v\u1eadt \u1edf trong n\u01b0\u1edbc.<br\/>d l\u00e0 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a v\u1eadt. ${{d}_{n}}$ l\u00e0 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc.<br\/>Suy ra: $V=\\dfrac{{{P}_{n}}}{d-{{d}_{n}}}$<br\/>$P=d\\times V=d\\times \\dfrac{{{P}_{n}}}{d-{{d}_{n}}}$ <br\/> Thay s\u1ed1: P=243,75N<br\/><span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2665},{"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":"Th\u1ea3 m\u1ed9t v\u1eadt \u0111\u1eb7c c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang ${{d}_{v}}$ v\u00e0o m\u1ed9t b\u00ecnh \u0111\u1ef1ng ch\u1ea5t l\u1ecfng c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang ${{d}_{l}}$ th\u00ec: ","select":["A. V\u1eadt s\u1ebd ch\u00ecm xu\u1ed1ng \u0111\u00e1y r\u1ed3i l\u1ea1i n\u1ed5i l\u00ean l\u01a1 l\u1eedng trong ch\u1ea5t l\u1ecfng khi ${{d}_{v}}$ > ${{d}_{l}}$ .","B. V\u1eadt s\u1ebd chim xu\u1ed1ng \u0111\u00e1y r\u1ed3i l\u1ea1i n\u1ed5i l\u00ean m\u1ed9t ph\u1ea7n m\u1eb7t ch\u1ea5t l\u1ecfng khi ${{d}_{v}}$ = ${{d}_{l}}$ .","C. V\u1eadt s\u1ebd ch\u00ecm xu\u1ed1ng \u0111\u00e1y r\u1ed3i n\u1eb1m im t\u1ea1i \u0111\u00e1y khi ${{d}_{v}}$ > ${{d}_{l}}$ .","D. V\u1eadt s\u1ebd ch\u00ecm xu\u1ed1ng \u0111\u00e1y r\u1ed3i l\u1ea1i n\u1ed1i m\u1ed9t n\u1eeda tr\u00ean m\u1eb7t ch\u1ea5t l\u1ecfng khi ${{d}_{v}}$ = 2${{d}_{l}}$ ."],"hint":"","explain":"<span class='basic_left'>V\u1eadt s\u1ebd ch\u00ecm xu\u1ed1ng \u0111\u00e1y r\u1ed3i n\u1eb1m im t\u1ea1i \u0111\u00e1y khi ${{d}_{v}}$ > ${{d}_{l}}$. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2666},{"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 v\u1eadt 1 v\u00e0 2 c\u00f3 c\u00f9ng th\u1ec3 t\u00edch \u0111\u01b0\u1ee3c th\u1ea3 v\u00e0o m\u1ed9t b\u00ecnh \u0111\u1ef1ng n\u01b0\u1edbc. V\u1eadt 1 ch\u00ecm xu\u1ed1ng \u0111\u00e1y b\u00ecnh, v\u1eadt 2 l\u01a1 l\u1eedng trong n\u01b0\u1edbc. N\u1ebfu g\u1ecdi ${{P}_{1}}$ l\u00e0 tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt 1, ${{F}_{1}}$ l\u00e0 l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t t\u00e1c d\u1ee5ng l\u00ean v\u1eadt 1; ${{P}_{2}}$ l\u00e0 tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt 2, ${{F}_{2}}$ l\u00e0 l\u1ef1c \u0111\u00e1y \u00c1c-si-m\u00e9t t\u00e1c d\u1ee5ng l\u00ean v\u1eadt 2 th\u00ec : ","select":["A. ${{F}_{1}}$ = ${{F}_{2}}$ v\u00e0 ${{P}_{1}}$ > ${{P}_{2}}$.","B. ${{F}_{1}}$ > ${{F}_{2}}$ v\u00e0 ${{P}_{1}}$> ${{P}_{2}}$.","C. ${{F}_{1}}$ = ${{F}_{2}}$ v\u00e0 ${{P}_{1}}$ = ${{P}_{2}}$.","D. ${{F}_{1}}$ < ${{F}_{2}}$ v\u00e0 ${{P}_{1}}$ > ${{P}_{2}}$."],"hint":"","explain":"<span class='basic_left'>So s\u00e1nh \u0111\u00fang nh\u1ea5t l\u00e0: ${{F}_{1}}$ = ${{F}_{2}}$ v\u00e0 ${{P}_{1}}$ > ${{P}_{2}}$. <br\/>V\u00ec c\u00f9ng th\u1ec3 t\u00edch n\u00ean l\u1ef1c \u0111\u1ea9y Acsim\u00e9t b\u1eb1ng nhau. V\u1eadt 1 ch\u00ecm xu\u1ed1ng \u0111\u00e1y n\u00ean n\u1eb7ng h\u01a1n v\u1eadt 2. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2667},{"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 phao b\u01a1i c\u00f3 th\u1ec3 t\u00edch 25d${{m}^{3}}$ v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng 5kg, h\u1ecfi l\u1ef1c \u0111\u1ea9y t\u00e1c d\u1ee5ng v\u00e0o phao khi d\u00ecm to\u00e0n b\u1ed9 phao trong n\u01b0\u1edbc? Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 10000N\/${{m}^{3}}$","select":["A. 100N.","B. 150N.","C. 200N.","D. 250N."],"hint":"","explain":"<span class='basic_left'>l\u1ef1c \u0111\u1ea9y t\u00e1c d\u1ee5ng v\u00e0o phao khi d\u00ecm to\u00e0n b\u1ed9 phao trong n\u01b0\u1edbcl\u00e0 l\u1ef1c \u0111\u1ea9y Acsimet, v\u1eady ${{F}_{A}}=25\\times {{10}^{-3}}\\times 10000=250N$ . <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2668},{"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 th\u1ea3 m\u1ed9t chi\u1ebfc nh\u1eabn \u0111\u1eb7c b\u1eb1ng b\u1ea1c (Ag) v\u00e0o th\u1ee7y ng\u00e2n (Hg) th\u00ec:","select":["A. Nh\u1eabn ch\u00ecm v\u00ec ${{d}_{Ag}}$ > ${{d}_{Hg}}$.","B. Nh\u1eabn n\u1ed5i v\u00ec ${{d}_{Ag}}$ < ${{d}_{Hg}}$.","C. Nh\u1eabn ch\u00ecm v\u00ec ${{d}_{Ag}}$ < ${{d}_{Hg}}$.","D. Nh\u1eabn n\u1ed5i v\u00ec ${{d}_{Ag}}$ > ${{d}_{Hg}}$."],"hint":"","explain":"<span class='basic_left'>Ta c\u00f3 B\u1ea1c nh\u1eb9 h\u01a1n Th\u1ee7y ng\u00e2n. Nh\u1eabn n\u1ed5i v\u00ec nh\u1eb9 h\u01a1n th\u1ee7y ng\u00e2n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2669},{"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":"D\u00f9ng tay \u1ea5n m\u1ed9t qu\u1ea3 c\u1ea7u r\u1ed7ng b\u1eb1ng kim lo\u1ea1i xu\u1ed1ng \u0111\u00e1y m\u1ed9t b\u00ecnh \u0111\u1ef1ng n\u01b0\u1edbc. Khi b\u1ecf tay ra, qu\u1ea3 c\u1ea7u t\u1eeb t\u1eeb n\u1ed5i l\u00ean v\u00e0 n\u1ed5i m\u1ed9t ph\u1ea7n tr\u00ean m\u1eb7t n\u01b0\u1edbc. Hi\u1ec7n t\u01b0\u1ee3ng tr\u00ean x\u1ea3y ra v\u00ec: ","select":["A. Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a ch\u1ea5t l\u00e0m qu\u1ea3 c\u1ea7u nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc.","B. L\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t lu\u00f4n b\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a qu\u1ea3 c\u1ea7u.","C. L\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t m\u1edbi \u0111\u1ea7u l\u1edbn h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng qu\u1ea3 c\u1ea7u, sau \u0111\u00f3 gi\u1ea3m d\u1ea7n t\u1edbi b\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a qu\u1ea3 c\u1ea7u.","D. L\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t m\u1edbi \u0111\u1ea7u l\u1edbn h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng qu\u1ea3 c\u1ea7u, sau \u0111i gi\u1ea3m d\u1ea7n t\u1edbi nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a qu\u1ea3 c\u1ea7u."],"hint":"","explain":"<span class='basic_left'>Khi b\u1ecf tay ra, qu\u1ea3 c\u1ea7u t\u1eeb t\u1eeb n\u1ed5i l\u00ean v\u00e0 n\u1ed5i m\u1ed9t ph\u1ea7n tr\u00ean m\u1eb7t n\u01b0\u1edbc. Hi\u1ec7n t\u01b0\u1ee3ng tr\u00ean x\u1ea3y ra v\u00ec l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t m\u1edbi \u0111\u1ea7u l\u1edbn h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng qu\u1ea3 c\u1ea7u, sau \u0111\u00f3 gi\u1ea3m d\u1ea7n t\u1edbi b\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a qu\u1ea3 c\u1ea7u, n\u00ean sau \u0111\u00f3 qu\u1ea3 c\u1ea7u c\u00e2n b\u1eb1ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2670},{"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 chai th\u1ee7y tinh c\u00f3 th\u1ec3 t\u00edch 1,5 l\u00edt v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng 250g. Ph\u1ea3i \u0111\u1ed5 v\u00e0o chai \u00edt nh\u1ea5t bao nhi\u00eau n\u01b0\u1edbc \u0111\u1ec3 ch\u00ecm n\u00f3 trong n\u01b0\u1edbc ? Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 10000N\/${{m}^{3}}$","select":["A. 0,75 l\u00edt.","B. 0,25 l\u00edt.","C. 1,5 l\u00edt.","D. 1,25 l\u00edt."],"hint":"","explain":"<span class='basic_left'>L\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t t\u00e1c d\u1ee5ng l\u00ean chai:${{F}_{A}}=V\\times {{d}_{nc}}=1,5\\times {{10}^{-3}}\\times 10000=15N$ <br\/>Tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a chai: $P=0,25\\times 10=2,5N$. <br\/>\u0110\u1ec3 chai ch\u00ecm trong n\u01b0\u1edbc c\u1ea7n \u0111\u1ed5 v\u00e0o chai m\u1ed9t l\u01b0\u1ee3ng n\u01b0\u1edbc c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng t\u1ed1i thi\u1ec3u l\u00e0:${{P}^{'}}={{F}_{A}}-P=15-2,5=12,5N$ <br\/>Th\u1ec3 t\u00edch n\u01b0\u1edbc c\u1ea7n \u0111\u1ed5 v\u00e0o chai l\u00e0:$V=\\dfrac{12,5}{10000}=1,25\\times {{10}^{-3}}{{m}^{3}}=1,25l$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2671},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"C\u00e2u n\u00e0o trong c\u00e1c c\u00e2u sau m\u00f4 t\u1ea3 cho s\u1ef1 n\u1ed5i? ","select":["A. M\u1ed9t v\u1eadt l\u01a1 l\u1eedng trong kh\u00f4ng kh\u00ed ho\u1eb7c kh\u00f4ng ch\u00ecm trong n\u01b0\u1edbc.","B. M\u1ed9t v\u1eadt c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang l\u1edbn h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a m\u00f4i tr\u01b0\u1eddng xung quanh.","C. Tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt l\u1edbn h\u01a1n s\u1ee9c \u0111\u1ea9y v\u1eadt l\u00ean.","D. Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a v\u1eadt nh\u1ecf h\u01a1n l\u1ef1c \u0111\u1ea9y v\u1eadt l\u00ean."],"hint":"","explain":"<span class='basic_left'>M\u1ed9t v\u1eadt l\u01a1 l\u1eedng trong kh\u00f4ng kh\u00ed ho\u1eb7c kh\u00f4ng ch\u00ecm trong n\u01b0\u1edbc \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 n\u1ed5i. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2672},{"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/bai12/lv2/img\/h14.jpg'\/><\/center>Ta bi\u1ebft c\u00f4ng th\u1ee9c t\u00ednh l\u1ef1c \u0111\u1ea9y Acsim\u00e9t l\u00e0 $F_A$= d x V. \u1ede h\u00ecnh v\u1ebd tr\u00ean th\u00ec V l\u00e0 th\u1ec3 t\u00edch n\u00e0o?","select":["A. Th\u1ec3 t\u00edch to\u00e0n b\u1ed9 v\u1eadt.","B. Th\u1ec3 t\u00edch ch\u1ea5t l\u1ecfng.","C. Th\u1ec3 t\u00edch ph\u1ea7n ch\u00ecm c\u1ee7a v\u1eadt.","D. Th\u1ec3 t\u00edch ph\u1ea7n n\u1ed5i c\u1ee7a."],"hint":"","explain":"<span class='basic_left'>L\u1ef1c \u0111\u1ea9y Acsim\u00e9t t\u1ef7 l\u1ec7 thu\u1eadn v\u1edbi th\u1ec3 t\u00edch ph\u1ea7n ch\u1ea5t l\u1ecfng b\u1ecb chi\u1ebfm. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2673},{"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 v\u1eadt m\u00f3c v\u00e0o 1 l\u1ef1c k\u1ebf; ngo\u00e0i kh\u00f4ng kh\u00ed l\u1ef1c k\u1ebf ch\u1ec9 2,13N. Khi nh\u00fang ch\u00ecm v\u1eadt v\u00e0o trong n\u01b0\u1edbc l\u1ef1c k\u1ebf ch\u1ec9 1,83N. Bi\u1ebft tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 10000N\/${{m}^{3}}$. Th\u1ec3 t\u00edch c\u1ee7a v\u1eadt l\u00e0:","select":["A. 213c${{m}^{3}}$.","B. 183c${{m}^{3}}$.","C. 30c${{m}^{3}}$.","D. 396c${{m}^{3}}$."],"hint":"","explain":"<span class='basic_left'>L\u1ef1c \u0111\u1ea9y Acsimet l\u00e0: ${{F}_{A}}=2,13-1,83=0,3N$<br\/>Th\u1ec3 t\u00edch c\u1ee7a v\u1eadt l\u00e0 : V=$\\dfrac{{{F}_{A}}}{d}=\\dfrac{0,3}{10000}=0,00003$${{m}^{3}}$ = 30${c{m}^{3}}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2674},{"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 v\u1eadt n\u1eb7ng 3600g c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang b\u1eb1ng 1800kg\/${{m}^{3}}$. Khi th\u1ea3 v\u00e0o ch\u1ea5t l\u1ecfng c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang b\u1eb1ng 850kg\/${{m}^{3}}$, n\u00f3 ho\u00e0n to\u00e0n n\u1eb1m d\u01b0\u1edbi m\u1eb7t ch\u1ea5t l\u1ecfng. V\u1eadt \u0111\u00e3 chi\u1ebfm ch\u1ed7 ch\u1ea5t l\u1ecfng c\u00f3 th\u1ec3 t\u00edch b\u1eb1ng:","select":["A. 2${{m}^{3}}$","B. ${{2.10}^{-1}}{{m}^{3}}$","C. ${{2.10}^{-2}}{{m}^{3}}$","D. ${{2.10}^{-3}}{{m}^{3}}$"],"hint":"","explain":"<span class='basic_left'>Th\u1ec3 t\u00edch c\u1ee7a v\u1eadt l\u00e0 th\u1ec3 t\u00edch v\u1eadt \u0111\u00e3 chi\u1ebfm ch\u1ed7 ch\u1ea5t l\u1ecfng: $V=\\dfrac{3,6}{1800}=0,002{{m}^{3}}$=${{2.10}^{-3}}{{m}^{3}}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2675},{"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 n\u1eb7ng 50kg \u0111ang n\u1ed5i tr\u00ean m\u1eb7t ch\u1ea5t l\u1ecfng. L\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t t\u00e1c d\u1ee5ng l\u00ean v\u1eadt b\u1eb1ng:","select":["A. > 500N.","B. 500N.","C. < 500N.","D. Kh\u00f4ng \u0111\u1ee7 d\u1eef li\u1ec7u \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh."],"hint":"","explain":"<span class='basic_left'>V\u00ec v\u1eadt n\u1ed5i \u0111\u01b0\u1ee3c n\u00ean l\u1ef1c \u0111\u1ea9y Acsim\u00e9t s\u1ebd b\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2676},{"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 l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng th\u00ec:","select":["A. V\u1eadt ch\u00ecm xu\u1ed1ng.","B. V\u1eadt n\u1ed5i l\u00ean.","C. V\u1eadt l\u01a1 l\u1eedng trong ch\u1ea5t l\u1ecfng.","D. V\u1eadt ch\u00ecm xu\u1ed1ng \u0111\u00e1y ch\u1ea5t l\u1ecfng."],"hint":"","explain":"<span class='basic_left'>Khi l\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng th\u00ec v\u1eadt ch\u00ecm xu\u1ed1ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2677},{"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 mi\u1ebfng g\u1ed7 th\u1ea3 v\u00e0o n\u01b0\u1edbc l\u1ea1i n\u1ed5i?","select":["A. V\u00ec tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a g\u1ed7 nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc.","B. V\u00ec tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a g\u1ed7 l\u1edbn h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc.","C. V\u00ec g\u1ed7 l\u00e0 v\u1eadt nh\u1eb9.","D. V\u00ec g\u1ed7 kh\u00f4ng th\u1ea5m n\u01b0\u1edbc."],"hint":"","explain":"<span class='basic_left'>Mi\u1ebfng g\u1ed7 th\u1ea3 v\u00e0o n\u01b0\u1edbc l\u1ea1i n\u1ed5i v\u00ec tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a g\u1ed7 nh\u1ecf h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2678},{"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/bai12/lv2/img\/h20.jpg'\/><\/center>C\u00f9ng m\u1ed9t v\u1eadt n\u1ed5i trong 2 ch\u1ea5t l\u1ecfng kh\u00e1c nhau c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang ${{d}_{1}}$ v\u00e0 ${{d}_{2}}$ nh\u01b0 h\u00ecnh v\u1ebd. S\u1ef1 so s\u00e1nh n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang?","select":["A. ${{d}_{1}}$>${{d}_{2}}$.","B. ${{d}_{1}}$<${{d}_{2}}$.","C. L\u1ef1c \u0111\u1ea9y \u00c1c-si-m\u00e9t trong hai tr\u01b0\u1eddng h\u1ee3p l\u00e0 nh\u01b0 nhau.","D. Tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a ph\u1ea7n ch\u1ea5t l\u1ecfng b\u1ecb chi\u1ebfm ch\u1ed7 trong hai tr\u01b0\u1eddng h\u1ee3p l\u00e0 nh\u01b0 nhau."],"hint":"","explain":"<span class='basic_left'> V\u00ec l\u1ef1c \u0111\u1ea9y Acsim\u00e9t c\u00f9ng b\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt, do v\u1eadt n\u1ed5i. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2679}],"lesson":{"save":0,"level":2}}