{"common":{"save":0,"post_id":"6341","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5856","mon_id":"1158790","chapter_id":"1158795","post_id":"6341","question":"<p>Khi <span class=\"math-tex\">$a. \\nu < 0$<\/span> thì…<\/p>","options":["A. v\u1eadt \u0111\u1ee9ng yên","B. v\u1eadt chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u","C. v\u1eadt chuy\u1ec3n \u0111\u1ed9ng nhanh d\u1ea7n","D. v\u1eadt chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n"],"correct":"4","level":"2","hint":"<p>Khi <span class=\"math-tex\">$a. \\nu < 0$<\/span> ( <span class=\"math-tex\">$\\overrightarrow{a}$<\/span> ng\u01b0\u1ee3c chi\u1ec1u v\u1edbi <span class=\"math-tex\">$\\overrightarrow{v}$<\/span> ) thì v\u1eadt chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n.<\/p>","answer":"<p><span style=\"color:#27ae60;\"><strong>Ch\u1ecdn D.<\/strong><\/span><br \/>Khi <span class=\"math-tex\">$a. \\nu < 0$<\/span> ( <span class=\"math-tex\">$\\overrightarrow{a}$<\/span> ng\u01b0\u1ee3c chi\u1ec1u v\u1edbi <span class=\"math-tex\">$\\overrightarrow{\\nu}$<\/span> ) thì v\u1eadt chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n.<\/p>","type":"choose","extra_type":"classic","user_id":"147","test":"0","date":"2022-10-25 08:43:44","option_type":"txt","len":2},{"id":"5857","mon_id":"1158790","chapter_id":"1158795","post_id":"6341","question":"<p>“N\u1ebfu gia t\u1ed1c c\u1ee7a chuy\u1ec3n \u0111\u1ed9ng có giá tr\u1ecb d\u01b0\u01a1ng thì v\u1eadt chuy\u1ec3n \u0111\u1ed9ng nhanh d\u1ea7n, n\u1ebfu gia t\u1ed1c c\u1ee7a chuy\u1ec3n \u0111\u1ed9ng có giá tr\u1ecb âm thì v\u1eadt chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n”. Nh\u1eadn \u0111\u1ecbnh này \u0111úng hay sai?<\/p>","options":["A. \u0110úng","B. Sai"],"correct":"2","level":"2","hint":"","answer":"<p><span style=\"color:#27ae60;\"><strong>Ch\u1ecdn B.<\/strong><\/span>N\u1ebfu <span class=\"math-tex\">$a$<\/span> và <span class=\"math-tex\">$\\nu$<\/span> cùng d\u1ea5u ( <span class=\"math-tex\">$\\overrightarrow{a}$<\/span> cùng chi\u1ec1u v\u1edbi <span class=\"math-tex\">$\\overrightarrow{\\nu}$<\/span> ) thì v\u1eadt chuy\u1ec3n \u0111\u1ed9ng nhanh d\u1ea7n.<br \/>N\u1ebfu <span class=\"math-tex\">$a$<\/span> và <span class=\"math-tex\">$\\nu$<\/span> trái d\u1ea5u ( <span class=\"math-tex\">$\\overrightarrow{a}$<\/span> cùng chi\u1ec1u v\u1edbi <span class=\"math-tex\">$\\overrightarrow{\\nu}$<\/span> ) thì v\u1eadt chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n.<\/p>","type":"choose","extra_type":"classic","user_id":"147","test":"0","date":"2022-10-25 08:46:16","option_type":"txt","len":1},{"id":"5858","mon_id":"1158790","chapter_id":"1158795","post_id":"6341","question":"<p>T\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m, m\u1ed9t v\u1eadt \u0111ang chuy\u1ec3n \u0111\u1ed9ng v\u1edbi v\u1eadn t\u1ed1c 60 km\/h, có gia t\u1ed1c a = 5 <span class=\"math-tex\">$m\/s^2$<\/span>. Hãy cho bi\u1ebft \u0111ây là lo\u1ea1i chuy\u1ec3n \u0111\u1ed9ng gì?<\/p>","options":["A. chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u ","B. chuy\u1ec3n \u0111\u1ed9ng nhanh d\u1ea7n","C. chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n","D. ch\u01b0a \u0111\u1ee7 d\u1eef ki\u1ec7n \u0111\u1ec3 k\u1ebft lu\u1eadn"],"correct":"2","level":"2","hint":"<p>Xét: a.v > 0 => chuy\u1ec3n \u0111\u1ed9ng nhanh d\u1ea7n<br \/>a.v < 0 => chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm d\u1ea7n<\/p>","answer":"<p><span style=\"color:#27ae60;\"><strong>Ch\u1ecdn B.<\/strong><\/span><br \/>V\u1eadt \u0111ang chuy\u1ec3n \u0111\u1ed9ng v\u1edbi v\u1eadn t\u1ed1c 60 km\/h, có gia t\u1ed1c a = 5 <span class=\"math-tex\">$m\/s^2$<\/span><\/p><p>Ta có: a.v > 0 => \u0111ây là chuy\u1ec3n \u0111\u1ed9ng nhanh d\u1ea7n.<\/p>","type":"choose","extra_type":"classic","user_id":"147","test":"0","date":"2022-10-25 08:48:03","option_type":"txt","len":2}]}