Khối lượng riêng. Áp suất chất lỏng

Home Lớp 10 Vật lý 10 - Sách kết nối tri thức Bài 34. Khối lượng riêng. Áp suất chất lỏngBài tập nâng cao

{"common":{"save":0,"post_id":"8863","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8375","mon_id":"1158790","chapter_id":"1159899","post_id":"8863","question":"M\u1ed9t ô tô t\u1ea3i khi ch\u01b0a ch\u1edf hàng có kh\u1ed1i l\u01b0\u1ee3ng 2500 kg và t\u1ed5ng di\u1ec7n tích các bánh xe ti\u1ebfp xúc v\u1edbi m\u1eb7t \u0111\u01b0\u1eddng là 250 cm². Khi ch\u1edf \u0111\u1ea7y hàng, áp su\u1ea5t do xe tác d\u1ee5ng lên m\u1eb7t \u0111\u01b0\u1eddng là 1 600 000 N\/m². Bi\u1ebft di\u1ec7n tích ti\u1ebfp xúc v\u1edbi m\u1eb7t \u0111\u01b0\u1eddng v\u1eabn không \u0111\u1ed5i. L\u1ea5y g = 10 m\/s². Kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a hàng hóa là<\/p>","options":["A.<\/strong> 1000 kg","B.<\/strong> 1500 kg","C.<\/strong> 2000 kg","D.<\/strong> 2500 kg"],"correct":"2","level":"3","hint":"","answer":"Ch\u1ecdn B.<\/strong> 1500 kg.<\/span><\/p>Tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a xe là $P_1=m_1.g=2500.10=25000(N)$<\/span><\/p>Áp l\u1ef1c do xe và hàng hóa tác d\u1ee5ng lên m\u1eb7t \u0111\u01b0\u1eddng là:<\/p>$p=\\dfrac{F_N}{S}$<\/span> ⇒ $F_N=p.S=1\\;600\\;000.250.10^{-4}=40\\;000$<\/span> (N).<\/p>Tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a hàng hóa là $P_2=F_N-P_1=$<\/span> 40 000 – 25 000 = 15 000 (N).<\/p>Suy ra kh\u1ed1i l\u01b0\u1ee3ng hàng hoá là $m_2=P_2:g=15000:10=1500$<\/span> (kg).<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-04-16 08:39:09","option_type":"txt","len":0},{"id":"8377","mon_id":"1158790","chapter_id":"1159899","post_id":"8863","question":"M\u1ed9t chi\u1ebfc huy ch\u01b0\u01a1ng vàng Olympic Tokyo 2020 ch\u1ee9a kho\u1ea3ng 6 g vàng và 494 g b\u1ea1c. Bi\u1ebft kh\u1ed1i l\u01b0\u1ee3ng riêng c\u1ee7a vàng là 19300 kg\/m³, c\u1ee7a b\u1ea1c là 10400 kg\/m³. Kh\u1ed1i l\u01b0\u1ee3ng riêng c\u1ee7a chi\u1ebfc huy ch\u01b0\u01a1ng này là<\/p>","options":["A.<\/strong> 31 100 kg\/m³","B.<\/strong> 10 458 kg\/m³","C.<\/strong> 14 750 kg\/m³","D.<\/strong> 14 850 kg\/m³"],"correct":"2","level":"3","hint":"","answer":"Ch\u1ecdn B.<\/strong> 10 458 kg\/m³.<\/span><\/p>Kh\u1ed1i l\u01b0\u1ee3ng riêng c\u1ee7a chi\u1ebfc huy ch\u01b0\u01a1ng này là:<\/p>$\\rho=\\dfrac{m_v+m_b}{V_v+V_b}=\\dfrac{m_v+m_b}{\\dfrac{m_v}{\\rho_v}+\\dfrac{m_b}{\\rho_b}}$<\/span> $=\\dfrac{0,006+0,494}{\\dfrac{0,006}{19300}+\\dfrac{0,494}{10400}}\\approx10458$<\/span> (kg\/m³).<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-04-16 08:49:49","option_type":"txt","len":2},{"id":"8380","mon_id":"1158790","chapter_id":"1159899","post_id":"8863","question":"Trong thí nghi\u1ec7m v\u1ebd \u1edf hình bên, ban \u0111\u1ea7u cân th\u0103ng b\u1eb1ng. Sau \u0111ó nhúng \u0111\u1ed3ng th\u1eddi c\u1ea3 hai v\u1eadt chìm trong n\u01b0\u1edbc \u1edf hai bình khác nhau. Ph\u01b0\u01a1ng án nào sau \u0111ây là \u0111úng<\/strong>?<\/p><svg height=\"80\" width=\"285\"> <g><title><\/title><rect fill=\"none\" height=\"82\" id=\"canvas_background\" width=\"287\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" id=\"canvasGrid\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" id=\"svg_1\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g><title><\/title><g id=\"svg_10\" stroke=\"null\"> <rect fill=\"#ffffaa\" height=\"51.19355\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"1.5\" width=\"64.94587\" x=\"2.5\" y=\"23.30645\"><\/rect> <rect fill=\"#d4ffaa\" height=\"36.35484\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"1.5\" width=\"58.60968\" x=\"221.8903\" y=\"22.56452\"><\/rect> <path d=\"m133.29661,21.14047l8.31624,-14.83871l8.31624,14.83871l-16.63248,0z\" fill=\"#fff\" fill-opacity=\"null\" id=\"svg_4\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"1.5\"><\/path> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_5\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"34.18091\" x2=\"34.18091\" y1=\"22.56452\" y2=\"5.5\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_6\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"249.21509\" x2=\"249.21509\" y1=\"22.56452\" y2=\"5.5\"><\/line> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_7\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"34.18091\" x2=\"249.6111\" y1=\"5.5\" y2=\"5.87097\"><\/line> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_8\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.7920227455207467,0,0,0.7419354490394059,0.7279204898486697,1.1612912176512764) \" x=\"23.23741\" xml:space=\"preserve\" y=\"70.84783\">S\u1ee9<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_9\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.7920227455207467,0,0,0.7419354490394059,0.7279204898486697,1.1612912176512764) \" x=\"298.23741\" xml:space=\"preserve\" y=\"61.84783\">S\u1eaft<\/text> <\/g> <\/g> <\/svg><\/span><\/p>","options":["A.<\/strong> Cân nghiêng v\u1ec1 bên trái.","B.<\/strong> Cân nghiêng v\u1ec1 bên ph\u1ea3i.","C.<\/strong> Cân v\u1eabn th\u0103ng b\u1eb1ng.","D.<\/strong> Ch\u01b0a xác \u0111\u1ecbnh \u0111\u01b0\u1ee3c vì ch\u01b0a bi\u1ebft \u0111\u1ed9 sâu c\u1ee7a n\u01b0\u1edbc trong các bình."],"correct":"2","level":"3","hint":"","answer":"Ch\u1ecdn B.<\/strong> Cân nghiêng v\u1ec1 bên ph\u1ea3i.<\/span><\/p>- Ban \u0111\u1ea7u cân th\u0103ng b\u1eb1ng nên kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a kh\u1ed1i s\u1ee9 và kh\u1ed1i s\u1eaft b\u1eb1ng nhau. - Do kh\u1ed1i l\u01b0\u1ee3ng riêng c\u1ee7a kh\u1ed1i s\u1eaft l\u1edbn h\u01a1n kh\u1ed1i l\u01b0\u1ee3ng riêng c\u1ee7a kh\u1ed1i s\u1ee9 nên th\u1ec3 tích c\u1ee7a s\u1ee9 l\u1edbn h\u01a1n th\u1ec3 tích c\u1ee7a s\u1eaft. Khi nhúng chìm c\u1ea3 2 v\u1eadt vào n\u01b0\u1edbc thì kh\u1ed1i s\u1ee9 s\u1ebd chi\u1ebfm th\u1ec3 tích c\u1ee7a n\u01b0\u1edbc nhi\u1ec1u h\u01a1n. ⇒ L\u1ef1c \u0111\u1ea9y Archimedes c\u1ee7a n\u01b0\u1edbc tác d\u1ee5ng lên kh\u1ed1i s\u1ee9 l\u1edbn h\u01a1n l\u1ef1c \u0111\u1ea9y Archimedes c\u1ee7a n\u01b0\u1edbc tác d\u1ee5ng lên kh\u1ed1i s\u1eaft. ⇒ Khi \u0111ó h\u1ee3p l\u1ef1c tác d\u1ee5ng lên kh\u1ed1i s\u1ee9 l\u1edbn h\u01a1n h\u1ee3p l\u1ef1c tác d\u1ee5ng lên kh\u1ed1i s\u1eaft. Hai h\u1ee3p l\u1ef1c này có ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng, chi\u1ec1u h\u01b0\u1edbng lên. Nên kh\u1ed1i s\u1ee9 b\u1ecb \u0111\u1ea9y lên cao h\u01a1n, khi \u0111ó thanh s\u1ebd nghiêng v\u1ec1 bên ph\u1ea3i (t\u1ee9c là v\u1ec1 phía kh\u1ed1i s\u1eaft).<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-04-16 09:01:17","option_type":"txt","len":3}]}