Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
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{"common":{"save":0,"post_id":"8638","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"9149","post_id":"8638","mon_id":"1159539","chapter_id":"1159710","question":"<p>M\u1ed9t v\u1eadt có th\u1ec3 tích <span class=\"math-tex\">$0,005\\ m^3$<\/span> b\u1ecb nhúng hoàn toàn trong m\u1ed9t ch\u1ea5t l\u1ecfng có tr\u1ecdng l\u01b0\u1ee3ng riêng <span class=\"math-tex\">$8500\\ N\/m^3$<\/span>. L\u1ef1c \u0111\u1ea9y Archimedes tác d\u1ee5ng lên v\u1eadt là bao nhiêu?<\/p>","options":["<strong data-end=\"296\" data-start=\"290\">A.<\/strong> 32,5 N","<strong data-end=\"312\" data-start=\"306\">B.<\/strong> 42,5 N","<strong data-end=\"328\" data-start=\"322\">C.<\/strong> 52,5 N","<strong data-end=\"344\" data-start=\"338\">D.<\/strong> 62,5 N"],"correct":"2","level":"3","hint":"<p>S\u1eed d\u1ee5ng công th\u1ee9c <span class=\"math-tex\">$F_A=dV$<\/span><\/p>","answer":"<p><strong data-end=\"421\" data-start=\"402\">\u0110áp án \u0111úng là:<\/strong> <strong data-end=\"312\" data-start=\"306\">B.<\/strong> 42,5 N<\/p><p>Gi\u1ea3i thích:<\/p><p><span class=\"math-tex\">$F_A=8500.0,005=42,5\\ N$<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"0","date":"2025-04-03 09:08:31","option_type":"txt","len":0},{"id":"9150","post_id":"8638","mon_id":"1159539","chapter_id":"1159710","question":"<p>M\u1ed9t kh\u1ed1i g\u1ed7 có kh\u1ed1i l\u01b0\u1ee3ng 5 kg, th\u1ec3 tích <span class=\"math-tex\">$0,01\\ m^3$<\/span> \u0111\u01b0\u1ee3c th\u1ea3 vào m\u1ed9t thùng n\u01b0\u1edbc. Bi\u1ebft tr\u1ecdng l\u01b0\u1ee3ng riêng c\u1ee7a n\u01b0\u1edbc là <span class=\"math-tex\">$10000 \\ N\/m^3$<\/span> và gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng <span class=\"math-tex\">$g=9,8\\ m\/s^2$<\/span>. Ph\u1ea7n th\u1ec3 tích c\u1ee7a kh\u1ed1i g\u1ed7 b\u1ecb chìm trong n\u01b0\u1edbc là bao nhiêu?<\/p>","options":["A. <span class=\"math-tex\">$0,003\\ m^3$<\/span>","B. <span class=\"math-tex\">$0,005\\ m^3$<\/span>","C. <span class=\"math-tex\">$0,007\\ m^3$<\/span>","D. <span class=\"math-tex\">$0,009\\ m^3$<\/span>"],"correct":"2","level":"3","hint":"<p>V\u1eadt n\u1ed5i khi l\u1ef1c \u0111\u1ea9y Archimedes b\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng v\u1eadt.<\/p>","answer":"<p>\u0110áp án \u0111úng là: B. <span class=\"math-tex\">$0,005\\ m^3$<\/span><\/p><p>Gi\u1ea3i thích:<\/p><p>Tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a kh\u1ed1i g\u1ed7: <span class=\"math-tex\">$P=mg=5.9,8=49\\ N$<\/span><\/p><p>L\u1ef1c \u0111\u1ea9y Archimedes b\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng ph\u1ea7n n\u01b0\u1edbc b\u1ecb chi\u1ebfm ch\u1ed7: <span class=\"math-tex\">$F_A=d.V_{ch\u00ecm}=10000.V_{ch\u00ecm}$<\/span><\/p><p>Khi v\u1eadt n\u1ed5i: <span class=\"math-tex\">$F_A=P$<\/span><\/p><p><span class=\"math-tex\">$=> 10000.V_{ch\u00ecm}=49$<\/span><\/p><p><span class=\"math-tex\">$V_{ch\u00ecm}={49 \\over 10000}=0,005\\ m^3$<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"0","date":"2025-04-03 09:22:47","option_type":"math","len":0},{"id":"9151","post_id":"8638","mon_id":"1159539","chapter_id":"1159710","question":"<p>M\u1ed9t th\u1ee3 l\u1eb7n l\u1eb7n xu\u1ed1ng h\u1ed3 n\u01b0\u1edbc \u1edf \u0111\u1ed9 sâu 3 m. Bi\u1ebft tr\u1ecdng l\u01b0\u1ee3ng riêng c\u1ee7a n\u01b0\u1edbc là <span class=\"math-tex\">$10000\\ N\/m^3$<\/span>. Áp su\u1ea5t do n\u01b0\u1edbc tác d\u1ee5ng lên th\u1ee3 l\u1eb7n \u1edf \u0111\u1ed9 sâu \u0111ó là bao nhiêu?<\/p>","options":["A. <span class=\"math-tex\">$2,5.10^4\\ Pa$<\/span>","B. <span class=\"math-tex\">$3,0.10^4\\ Pa$<\/span>","C. <span class=\"math-tex\">$3,5.10^4\\ Pa$<\/span>","D. <span class=\"math-tex\">$4,0.10^4\\ Pa$<\/span>"],"correct":"2","level":"3","hint":"<p>S\u1eed d\u1ee5ng công th\u1ee9c tính áp su\u1ea5t ch\u1ea5t l\u1ecfng <span class=\"math-tex\">$p=dh$<\/span><\/p>","answer":"<p>\u0110áp án \u0111úng là: B. <span class=\"math-tex\">$3,0.10^4\\ Pa$<\/span><\/p><p>Gi\u1ea3i thích:<\/p><p><span class=\"math-tex\">$p=dh=10000.3=30000\\ Pa$<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"0","date":"2025-04-03 09:32:02","option_type":"math","len":0}]}