{"common":{"save":0,"post_id":"8533","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7724","mon_id":"1158790","chapter_id":"1158796","post_id":"8533","question":"<p>Cho hai v\u1eadt có cùng kh\u1ed1i l\u01b0\u1ee3ng, cùng th\u1ec3 tích nh\u01b0ng m\u1ed9t v\u1eadt hình h\u1ed9p, v\u1eadt kia hình l\u1eadp ph\u01b0\u01a1ng. Khi nhúng c\u1ea3 hai v\u1eadt chìm trong cùng m\u1ed9t ch\u1ea5t l\u1ecfng thì<\/p>","options":["<strong>A.<\/strong> l\u1ef1c \u0111\u1ea9y Archimedes tác d\u1ee5ng lên hình l\u1eadp ph\u01b0\u01a1ng l\u1edbn h\u01a1n hình h\u1ed9p.","<strong>B.<\/strong> l\u1ef1c \u0111\u1ea9y Archimedes tác d\u1ee5ng lên hình l\u1eadp ph\u01b0\u01a1ng nh\u1ecf h\u01a1n hình h\u1ed9p.","<strong>C.<\/strong> l\u1ef1c \u0111\u1ea9y Archimedes tác d\u1ee5ng lên hai v\u1eadt là nh\u01b0 nhau.","<strong>D.<\/strong> C\u1ea3 ba tr\u01b0\u1eddng h\u1ee3p \u0111\u1ec1u có th\u1ec3 x\u1ea3y ra."],"correct":"3","level":"3","hint":"<p>L\u1ef1c \u0111\u1ea9y Archimedes ph\u1ee5 thu\u1ed9c vào th\u1ec3 tích mà không ph\u1ee5 thu\u1ed9c vào kh\u1ed1i l\u01b0\u1ee3ng.<\/p>","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> l\u1ef1c \u0111\u1ea9y Archimedes tác d\u1ee5ng lên hai v\u1eadt là nh\u01b0 nhau.<\/span><\/p><p>Bi\u1ec3u th\u1ee9c tính l\u1ef1c \u0111\u1ea9y Archimedes là <span class=\"math-tex\">$F_A=\\rho gV$<\/span>.<br \/>Trong \u0111ó: <span class=\"math-tex\">$\\rho$<\/span> là kh\u1ed1i l\u01b0\u1ee3ng riêng c\u1ee7a ch\u1ea5t l\u1ecfng, g là gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng, V là th\u1ec3 tích c\u1ee7a ph\u1ea7n ch\u1ea5t l\u1ecfng b\u1ecb v\u1eadt chi\u1ebfm ch\u1ed7.<br \/>⇒ L\u1ef1c \u0111\u1ea9y Archimedes ph\u1ee5 thu\u1ed9c vào th\u1ec3 tích mà không ph\u1ee5 thu\u1ed9c vào kh\u1ed1i l\u01b0\u1ee3ng. Vì hai v\u1eadt có cùng th\u1ec3 tích nên l\u1ef1c \u0111\u1ea9y Archimedes tác d\u1ee5ng lên hai v\u1eadt là nh\u01b0 nhau.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-02-25 08:33:29","option_type":"txt","len":3},{"id":"7727","mon_id":"1158790","chapter_id":"1158796","post_id":"8533","question":"<p>Nhúng m\u1ed9t v\u1eadt vào trong m\u1ed9t ch\u1eadu \u0111\u1ef1ng ch\u1ea5t l\u1ecfng. Nh\u1eefng y\u1ebfu t\u1ed1 <strong>không <\/strong>\u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn l\u1ef1c \u0111\u1ea9y Archimedes?<\/p>","options":["<strong>A.<\/strong> L\u01b0\u1ee3ng ch\u1ea5t l\u1ecfng ch\u1ee9a trong ch\u1eadu khi v\u1eadt n\u1ed5i ho\u1eb7c chìm hoàn toàn trong ch\u1ea5t l\u1ecfng.","<strong>B.<\/strong> Hình dáng c\u1ee7a ch\u1eadu \u0111\u1ef1ng ch\u1ea5t l\u1ecfng.","<strong>C.<\/strong> Tr\u1ecdng l\u01b0\u1ee3ng riêng c\u1ee7a ch\u1ea5t l\u1ecfng.","<strong>D.<\/strong> C\u1ea3 B và C \u0111\u1ec1u \u0111úng."],"correct":"4","level":"3","hint":"<p>D\u1ef1a vào công th\u1ee9c tính l\u1ef1c \u0111\u1ea9y Archimedes: <span class=\"math-tex\">$F_A=\\rho gV$<\/span>.<\/p>","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> C\u1ea3 B và C \u0111\u1ec1u \u0111úng.<\/span><\/p><p>L\u1ef1c \u0111\u1ea9y Archimedes: <span class=\"math-tex\">$F_A=\\rho gV$<\/span>.<\/p><p>Trong \u0111ó: <span class=\"math-tex\">$\\rho$<\/span> là kh\u1ed1i l\u01b0\u1ee3ng riêng c\u1ee7a ch\u1ea5t l\u1ecfng, g là gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng, V là th\u1ec3 tích c\u1ee7a ph\u1ea7n ch\u1ea5t l\u1ecfng b\u1ecb v\u1eadt chi\u1ebfm ch\u1ed7.<br \/>⇒ Nh\u1eefng y\u1ebfu t\u1ed1 không \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn l\u1ef1c \u0111\u1ea9y Archimedes là hình dáng c\u1ee7a ch\u1eadu \u0111\u1ef1ng ch\u1ea5t l\u1ecfng và l\u01b0\u1ee3ng ch\u1ea5t l\u1ecfng ch\u1ee9a trong ch\u1eadu khi v\u1eadt n\u1ed5i ho\u1eb7c chìm hoàn toàn trong ch\u1ea5t l\u1ecfng.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-02-25 08:36:56","option_type":"txt","len":3},{"id":"7729","mon_id":"1158790","chapter_id":"1158796","post_id":"8533","question":"<p>M\u1ed9t v\u1eadt có kh\u1ed1i l\u01b0\u1ee3ng 567 g làm b\u1eb1ng ch\u1ea5t có kh\u1ed1i l\u01b0\u1ee3ng riêng 10,5 g\/cm³ \u0111\u01b0\u1ee3c nhúng hoàn toàn trong n\u01b0\u1edbc. Tìm l\u1ef1c \u0111\u1ea9y Archimedes tác d\u1ee5ng lên v\u1eadt, bi\u1ebft kh\u1ed1i l\u01b0\u1ee3ng riêng c\u1ee7a n\u01b0\u1edbc là 997 kg\/m³.<\/p>","options":["<strong>A.<\/strong> 0,557 N","<strong>B.<\/strong> 0,538 N","<strong>C.<\/strong> 0,543 N","<strong>D.<\/strong> 0,435 N"],"correct":"2","level":"3","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> 0,538 N.<\/span><\/p><p>- Th\u1ec3 tích c\u1ee7a v\u1eadt là: <span class=\"math-tex\">$V=\\dfrac{m}{D}=\\dfrac{567}{10,5}=54\\;(cm^3)=54.10^{-6}\\;(m^3)$<\/span>.<\/p><p>- Vì v\u1eadt \u0111\u01b0\u1ee3c nhúng chìm hoàn toàn trong n\u01b0\u1edbc nên th\u1ec3 tích c\u1ee7a ph\u1ea7n n\u01b0\u1edbc b\u1ecb v\u1eadt chi\u1ebfm ch\u1ed7 b\u1eb1ng th\u1ec3 tích c\u1ee7a v\u1eadt.<\/p><p>- L\u1ef1c \u0111\u1ea9y Archimedes do n\u01b0\u1edbc tác d\u1ee5ng lên v\u1eadt là: <span class=\"math-tex\">$F_A=\\rho gV=997.10.54.10^{-6}\\approx0,538\\;(N)$<\/span>.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-02-25 08:45:15","option_type":"txt","len":0}]}