Bài 27: Thực hành đo năng lượng nhiệt bằng joulemeter

Home Lớp 8 Khoa học tự nhiên 8 - sách Kết nối tri thức Bài 27: Thực hành đo năng lượng nhiệt bằng joulemeterBài tập trung bình

{"common":{"save":0,"post_id":"9448","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"10068","post_id":"9448","mon_id":"1159539","chapter_id":"1160023","question":"T\u1ea1i sao c\u1ea7n khu\u1ea5y nh\u1eb9 n\u01b0\u1edbc<\/strong> trong quá trình \u0111un khi \u0111o n\u0103ng l\u01b0\u1ee3ng b\u1eb1ng joulemeter?<\/p>","options":["A. \u0110\u1ec3 n\u01b0\u1edbc ngu\u1ed9i nhanh h\u01a1n","B. \u0110\u1ec3 nhi\u1ec7t \u0111\u1ed9 phân b\u1ed1 \u0111\u1ec1u trong bình","C. \u0110\u1ec3 t\u0103ng t\u1ed1c \u0111\u1ed9 \u0111un","D. \u0110\u1ec3 nhi\u1ec7t l\u01b0\u1ee3ng k\u1ebf dùng \u0111\u01b0\u1ee3c lâu h\u01a1n"],"correct":"2","level":"2","hint":"Nhi\u1ec7t l\u01b0\u1ee3ng truy\u1ec1n t\u1eeb dây \u0111\u1ed1t \u0111\u1ebfn toàn b\u1ed9 kh\u1ed1i n\u01b0\u1edbc nh\u01b0 th\u1ebf nào?<\/p>","answer":"\u0110áp án \u0111úng là: B. \u0110\u1ec3 nhi\u1ec7t \u0111\u1ed9 phân b\u1ed1 \u0111\u1ec1u trong bình<\/strong> Gi\u1ea3i thích:<\/strong><\/p>Khu\u1ea5y giúp nhi\u1ec7t lan \u0111\u1ec1u, tránh ch\u1ed7 nóng ch\u1ed7 l\u1ea1nh → phép \u0111o chính xác h\u01a1n<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"0","date":"2025-06-17 07:57:29","option_type":"txt","len":3},{"id":"10069","post_id":"9448","mon_id":"1159539","chapter_id":"1160023","question":"S\u1ed1 li\u1ec7u \u0111\u1ecdc trên joulemeter khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng 3\u202f°C, 6\u202f°C, 9\u202f°C l\u1ea7n l\u01b0\u1ee3t \u0111\u01b0\u1ee3c ghi vào b\u1ea3ng \u0111\u1ec3 làm gì?<\/p>","options":["A. Tính trung bình nhi\u1ec7t l\u01b0\u1ee3ng","B. Ki\u1ec3m tra hi\u1ec7u su\u1ea5t thi\u1ebft b\u1ecb","C. Xác \u0111\u1ecbnh m\u1ed1i quan h\u1ec7 gi\u1eefa nhi\u1ec7t l\u01b0\u1ee3ng và \u0111\u1ed9 t\u0103ng nhi\u1ec7t","D. So sánh v\u1edbi nhi\u1ec7t l\u01b0\u1ee3ng k\u1ebf khác"],"correct":"3","level":"2","hint":"Khi l\u01b0\u1ee3ng n\u01b0\u1edbc t\u0103ng, nhi\u1ec7t l\u01b0\u1ee3ng trung bình có thay \u0111\u1ed5i không?<\/p>","answer":"\u0110áp án \u0111úng là: C. Xác \u0111\u1ecbnh m\u1ed1i quan h\u1ec7 gi\u1eefa nhi\u1ec7t l\u01b0\u1ee3ng và \u0111\u1ed9 t\u0103ng nhi\u1ec7t<\/strong> Gi\u1ea3i thích:<\/strong><\/p>Các m\u1ee9c t\u0103ng nhi\u1ec7t dùng \u0111\u1ec3 tính Q &prop; Δt → t\u1ed5ng quát hóa k\u1ebft qu\u1ea3 thí nghi\u1ec7m<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"0","date":"2025-06-17 07:58:26","option_type":"txt","len":3},{"id":"10070","post_id":"9448","mon_id":"1159539","chapter_id":"1160023","question":"Sau khi \u0111un \u0111\u1ebfn khi t\u0103ng 9\u202f°C, joulemeter ch\u1ec9 giá tr\u1ecb 7560\u202fJ v\u1edbi 0,2\u202fkg n\u01b0\u1edbc. \u0110ây chính là:<\/p>","options":["A. Công su\u1ea5t bình","B. Nhi\u1ec7t l\u01b0\u1ee3ng n\u01b0\u1edbc nh\u1eadn \u0111\u01b0\u1ee3c","C. Nhi\u1ec7t l\u01b0\u1ee3ng t\u1ecfa ra môi tr\u01b0\u1eddng","D. T\u1ed5ng nhi\u1ec7t n\u0103ng ban \u0111\u1ea7u c\u1ee7a n\u01b0\u1edbc"],"correct":"2","level":"2","hint":"Joulemeter \u0111o n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n cung c\u1ea5p cho dây \u0111\u1ed1t → chuy\u1ec3n hóa thành gì?<\/p>","answer":"\u0110áp án \u0111úng là: B. Nhi\u1ec7t l\u01b0\u1ee3ng n\u01b0\u1edbc nh\u1eadn \u0111\u01b0\u1ee3c<\/strong> Gi\u1ea3i thích:<\/strong><\/p>\u0110ây là n\u0103ng l\u01b0\u1ee3ng \u0111ã dùng \u0111\u1ec3 làm t\u0103ng nhi\u1ec7t \u0111\u1ed9 n\u01b0\u1edbc, không tính th\u1ea5t thoát.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"0","date":"2025-06-17 07:59:23","option_type":"txt","len":2}]}