{"common":{"save":0,"post_id":"9450","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"10088","post_id":"9450","mon_id":"1159539","chapter_id":"1160023","question":"<p>M\u1ed9t h\u1ecdc sinh \u0111un 0,2 kg n\u01b0\u1edbc, nhi\u1ec7t \u0111\u1ed9 t\u0103ng t\u1eeb 25°C lên 40°C. Joulemeter \u0111o \u0111\u01b0\u1ee3c n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n tiêu th\u1ee5 là 15000 J. H\u1ecfi nhi\u1ec7t l\u01b0\u1ee3ng n\u01b0\u1edbc thu vào là bao nhiêu? Bi\u1ebft nhi\u1ec7t dung riêng c\u1ee7a n\u01b0\u1edbc <span class=\"math-tex\">$c=4200\\ J\/kg.^oC$<\/span>.<\/p>","options":["A. 12600 J","B. 8400 J","C. 15000 J","D. 18000 J"],"correct":"1","level":"3","hint":"<p>Dùng công th\u1ee9c <span class=\"math-tex\">$Q=mc\u0394t$<\/span><\/p>","answer":"<p><strong data-end=\"660\" data-start=\"630\">\u0110áp án \u0111úng là: A. 12600 J<\/strong><br data-end=\"663\" data-start=\"660\" \/><strong data-end=\"678\" data-start=\"663\">Gi\u1ea3i thích:<\/strong><\/p><p><strong data-end=\"678\" data-start=\"663\"><span class=\"math-tex\">$\u0394t=40-25=15^oC$<\/span><\/strong><\/p><p><strong data-end=\"678\" data-start=\"663\"><span class=\"math-tex\">$Q=0,2.4200.15=12600\\ J$<\/span><\/strong><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"0","date":"2025-06-17 09:21:43","option_type":"txt","len":0},{"id":"10089","post_id":"9450","mon_id":"1159539","chapter_id":"1160023","question":"<p>Trong m\u1ed9t thí nghi\u1ec7m khác, h\u1ecdc sinh \u0111un 0,3 kg n\u01b0\u1edbc t\u1eeb 20°C lên 35°C. Nhi\u1ec7t n\u0103ng c\u1ea7n thi\u1ebft là:<\/p>","options":["A. 12600 J","B. 18900 J","C. 6300 J","D. 9450 J"],"correct":"2","level":"3","hint":"<p>Dùng <span class=\"math-tex\">$Q=mc\u0394t$<\/span>, v\u1edbi <span class=\"math-tex\">$c=4200$<\/span><\/p>","answer":"<p><strong data-end=\"1385\" data-start=\"1355\">\u0110áp án \u0111úng là: B. 18900 J<\/strong><br data-end=\"1388\" data-start=\"1385\" \/><strong data-end=\"1403\" data-start=\"1388\">Gi\u1ea3i thích:<\/strong><\/p><p><strong data-end=\"1403\" data-start=\"1388\"><span class=\"math-tex\">$Q=0,3.4200.15=18900\\ J$<\/span><\/strong><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"0","date":"2025-06-17 09:23:45","option_type":"txt","len":0},{"id":"10090","post_id":"9450","mon_id":"1159539","chapter_id":"1160023","question":"<p>M\u1ed9t nhóm h\u1ecdc sinh ghi \u0111\u01b0\u1ee3c s\u1ed1 li\u1ec7u:<br data-end=\"1523\" data-start=\"1520\" \/>– Kh\u1ed1i l\u01b0\u1ee3ng n\u01b0\u1edbc: 0,25 kg<br data-end=\"1552\" data-start=\"1549\" \/>– Nhi\u1ec7t \u0111\u1ed9 t\u0103ng: 10°C<br data-end=\"1576\" data-start=\"1573\" \/>– N\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n tiêu th\u1ee5: 11500 J<br data-end=\"1614\" data-start=\"1611\" \/>Hãy tính hi\u1ec7u su\u1ea5t chuy\u1ec3n \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng trong thí nghi\u1ec7m.<\/p>","options":["A. 91%","B. 92%","C. 93%","D. 94%"],"correct":"1","level":"3","hint":"<p>Tính <span class=\"math-tex\">$Q=mc\u0394t$<\/span>, r\u1ed3i tính hi\u1ec7u su\u1ea5t.<\/p>","answer":"<p><strong data-end=\"1799\" data-start=\"1773\">\u0110áp án \u0111úng là: A. 91%<\/strong><br data-end=\"1802\" data-start=\"1799\" \/><strong data-end=\"1817\" data-start=\"1802\">Gi\u1ea3i thích:<\/strong><\/p><p><strong data-end=\"1817\" data-start=\"1802\"><span class=\"math-tex\">$Q=0,25.4200.10 = 10500\\ J$<\/span><\/strong><\/p><p><strong data-end=\"1817\" data-start=\"1802\"><span class=\"math-tex\">$\u03b7= {10500 \\over 11500}.100\\%=91,3\\%$<\/span><\/strong><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"0","date":"2025-06-17 09:26:46","option_type":"txt","len":0}]}
