{"common":{"save":0,"post_id":"8648","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7960","mon_id":"1158790","chapter_id":"1159772","post_id":"8648","question":"<p>C&ocirc;ng su\u1ea5t c\u1ee7a m\u1ed9t ng\u01b0\u1eddi k&eacute;o m\u1ed9t th&ugrave;ng&nbsp;n\u01b0\u1edbc chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u kh\u1ed1i l\u01b0\u1ee3ng 15kg&nbsp;t\u1eeb gi\u1ebfng s&acirc;u 6m l&ecirc;n trong 20 gi&acirc;y (l\u1ea5y g&nbsp;=&nbsp;10 m\/s&sup2;) l&agrave;:<\/p>","options":["<strong>A.<\/strong> 90 W.","<strong>B.<\/strong> 45 W.","<strong>C.<\/strong> 15 W.","<strong>D.<\/strong> 4,5 W."],"correct":"2","level":"2","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>B.<\/strong> 45 W.<\/span><\/p><p>C&ocirc;ng su\u1ea5t c\u1ee7a ng\u01b0\u1eddi \u0111&oacute; l&agrave;:&nbsp;<span class=\"math-tex\">$\\mathscr{P}=\\dfrac{A}{t}=\\dfrac{P.s}{t}=\\dfrac{m.g.t}{t}=\\dfrac{15.10.6}{20}=45(W)$<\/span>.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-03-16 16:04:40","option_type":"txt","len":0},{"id":"7962","mon_id":"1158790","chapter_id":"1159772","post_id":"8648","question":"<p>M\u1ed9t ng\u01b0\u1eddi n\u1eb7ng 60 kg leo l&ecirc;n 1 c\u1ea7u&nbsp;thang. Trong 10 s, ng\u01b0\u1eddi \u0111&oacute; leo \u0111\u01b0\u1ee3c 8m&nbsp;t&iacute;nh theo ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng. Cho g = 10m\/s&sup2;. C&ocirc;ng su\u1ea5t ng\u01b0\u1eddi \u0111&oacute; th\u1ef1c hi\u1ec7n&nbsp;\u0111\u01b0\u1ee3c t&iacute;nh theo HP (m&atilde; l\u1ef1c, 1 HP &asymp; 746W) l&agrave;:<\/p>","options":["<strong>A.<\/strong> 480 HP.","<strong>B.<\/strong> 2,10 HP.","<strong>C.<\/strong> 1,56 HP.","<strong>D.<\/strong> 0,643 HP."],"correct":"4","level":"2","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>D.<\/strong>&nbsp;0,643 HP.<\/span><\/p><p>C&ocirc;ng su\u1ea5t ng\u01b0\u1eddi \u0111&oacute; th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c l&agrave;:&nbsp;<span class=\"math-tex\">$\\mathscr{P}=\\dfrac{P.h}{t}=\\dfrac{60.10.8}{10}=480(W)\\approx0,643(HP)$<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-03-16 16:11:22","option_type":"txt","len":1},{"id":"7963","mon_id":"1158790","chapter_id":"1159772","post_id":"8648","question":"<p>M\u1ed9t h\u1ecdc sinh n&acirc;ng t\u1ea1 c&oacute; kh\u1ed1i l\u01b0\u1ee3ng 80 kg&nbsp;l&ecirc;n cao 60 cm trong t = 0,8s. Trong&nbsp;tr\u01b0\u1eddng h\u1ee3p h\u1ecdc sinh \u0111&atilde; ho\u1ea1t \u0111\u1ed9ng v\u1edbi&nbsp;c&ocirc;ng su\u1ea5t l&agrave; bao nhi&ecirc;u? L\u1ea5y g=10m\/s&sup2;.<\/p>","options":["<strong>A.<\/strong> 400 W.","<strong>B.<\/strong> 500 W.","<strong>C.<\/strong> 600 W.","<strong>D.<\/strong> 700 W."],"correct":"3","level":"2","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>C.<\/strong>&nbsp;600 W.<\/span><\/p><p>C&ocirc;ng su\u1ea5t c\u1ee7a h\u1ecdc sinh:&nbsp;<span class=\"math-tex\">$\\mathscr{P}=\\dfrac{A}{t}=\\dfrac{F.s}{t}$<\/span>.<\/p><p>M&agrave; F = P&nbsp; = mg = 80 . 10 = 800 (N)&nbsp;&rArr; <span class=\"math-tex\">$\\mathscr{P}$<\/span> =&nbsp;<span class=\"math-tex\">$\\dfrac{800.0,6}{0,8}=600(W)$<\/span>.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-03-16 16:17:59","option_type":"txt","len":0}]}