Khối lượng riêng

Home Lớp 8 Khoa học tự nhiên 8 - sách Kết nối tri thức Bài 13: Khối lượng riêngBài tập cơ bản

{"common":{"save":0,"post_id":"8420","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7140","post_id":"8420","mon_id":"1159539","chapter_id":"1159710","question":"Kh\u1ed1i l\u01b0\u1ee3ng riêng c\u1ee7a m\u1ed9t ch\u1ea5t \u0111\u01b0\u1ee3c xác \u0111\u1ecbnh b\u1eb1ng công th\u1ee9c nào?<\/p>","options":["A. D = m.V","B. $D = {m\\over V}$<\/span>","C. D = V.m","D. $D = {V \\over m}$<\/span>"],"correct":"2","level":"1","hint":"D\u1ef1a vào khái ni\u1ec7m: Kh\u1ed1i l\u01b0\u1ee3ng riêng c\u1ee7a m\u1ed9t ch\u1ea5t \u0111\u01b0\u1ee3c xác \u0111\u1ecbnh b\u1eb1ng kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a m\u1ed9t \u0111\u01a1n v\u1ecb th\u1ec3 tích ch\u1ea5t \u0111ó.<\/p>","answer":"\u0110áp án \u0111úng là: B<\/strong><\/p>Kh\u1ed1i l\u01b0\u1ee3ng riêng ($D$<\/span>)<\/span> c\u1ee7a m\u1ed9t ch\u1ea5t \u0111\u01b0\u1ee3c tính b\u1eb1ng th\u01b0\u01a1ng s\u1ed1 gi\u1eefa kh\u1ed1i l\u01b0\u1ee3ng ($m$<\/span>)<\/span> c\u1ee7a v\u1eadt và th\u1ec3 tích ($V$<\/span>)<\/span> c\u1ee7a nó:<\/p> $D = {m\\over V}$<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2025-02-04 17:26:46","option_type":"math","len":0},{"id":"7141","post_id":"8420","mon_id":"1159539","chapter_id":"1159710","question":"\u0110\u01a1n v\u1ecb \u0111o kh\u1ed1i l\u01b0\u1ee3ng riêng trong h\u1ec7 SI là gì?<\/p>","options":["A. $kg$<\/span>","B. $kg\/m^3$<\/span>","C. $N\/m^3$<\/span>","D. $g\/cm^3$<\/span>"],"correct":"2","level":"1","hint":"\u0110\u01a1n v\u1ecb c\u1ee7a kh\u1ed1i l\u01b0\u1ee3ng là kg; \u0111\u01a1n v\u1ecb c\u1ee7a th\u1ec3 tích là $m^3$<\/span>.<\/p>D\u1ef1a vào công th\u1ee9c tính kh\u1ed1i l\u01b0\u1ee3ng riêng.<\/p>","answer":"\u0110áp án \u0111úng là: B.<\/strong> $kg\/m^3$<\/span><\/p>Trong h\u1ec7 \u0111o l\u01b0\u1eddng qu\u1ed1c t\u1ebf (SI), \u0111\u01a1n v\u1ecb c\u1ee7a kh\u1ed1i l\u01b0\u1ee3ng là kg; \u0111\u01a1n v\u1ecb c\u1ee7a th\u1ec3 tích là $m^3$<\/span><\/p>nên \u0111\u01a1n v\u1ecb c\u1ee7a kh\u1ed1i l\u01b0\u1ee3ng riêng là kilogram<\/strong> trên mét kh\u1ed1i ($kg\/m^3$<\/span>).<\/strong><\/p>(M\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p c\u0169ng dùng $g\/cm^3$<\/span>, nh\u01b0ng \u0111ây không ph\u1ea3i \u0111\u01a1n v\u1ecb SI.)<\/em><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2025-02-04 17:49:38","option_type":"math","len":0},{"id":"7142","post_id":"8420","mon_id":"1159539","chapter_id":"1159710","question":"Trong các ch\u1ea5t sau, ch\u1ea5t nào có kh\u1ed1i l\u01b0\u1ee3ng riêng l\u1edbn nh\u1ea5t?<\/p>","options":["A. N\u01b0\u1edbc","B. S\u1eaft","C. Nhôm","D. G\u1ed7"],"correct":"2","level":"1","hint":"","answer":"\u0110áp án: B. S\u1eaft<\/p>Gi\u1ea3i thích:<\/p>Kh\u1ed1i l\u01b0\u1ee3ng riêng c\u1ee7a m\u1ed9t s\u1ed1 ch\u1ea5t:<\/p>- S\u1eaft: 7800 $kg\/m^3$<\/span><\/p>- Nhôm: 2700 $kg\/m^3$<\/span><\/p>- N\u01b0\u1edbc: 1000  $kg\/m^3$<\/span><\/p>- G\u1ed7: nh\u1ecf h\u01a1n 1000  $kg\/m^3$<\/span><\/p>V\u1eady s\u1eaft có kh\u1ed1i l\u01b0\u1ee3ng riêng l\u1edbn nh\u1ea5t trong các lo\u1ea1i này.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2025-02-04 18:06:09","option_type":"txt","len":1}]}