{"common":{"save":0,"post_id":"6158","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5208","mon_id":"1158790","chapter_id":"1158796","post_id":"6158","question":"<p>L\u1ef1c \u0111\u1eb7c tr\u01b0ng cho \u0111i\u1ec1u gì sau \u0111ây?<\/p>","options":["A. N\u0103ng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt nhi\u1ec1u hay ít. <br \/>\n ","B. V\u1eadt có kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn hay bé.","C. T\u01b0\u01a1ng tác gi\u1eefa v\u1eadt này lên v\u1eadt khác. ","D. V\u1eadt chuy\u1ec3n \u0111\u1ed9ng nhanh hay ch\u1eadm."],"correct":"3","level":"1","hint":"<p>L\u1ef1c là \u0111\u1ea1i l\u01b0\u1ee3ng vector \u0111\u1eb7c tr\u01b0ng cho tác d\u1ee5ng c\u1ee7a v\u1eadt này lên v\u1eadt khác.<\/p>","answer":"<p><strong>L\u1ef1c là \u0111\u1ea1i l\u01b0\u1ee3ng \u0111\u1eb7c tr\u01b0ng cho s\u1ef1 t\u01b0\u01a1ng tác gi\u1eefa v\u1eadt này lên v\u1eadt khác.<\/strong><\/p><p><span style=\"color:#27ae60;\"><strong>\u0110áp án \u0111úng: Ch\u1ecdn C. T\u01b0\u01a1ng tác gi\u1eefa v\u1eadt này lên v\u1eadt khác. <\/strong><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"147","test":"0","date":"2022-08-29 09:39:20","option_type":"txt","len":3},{"id":"5209","mon_id":"1158790","chapter_id":"1158796","post_id":"6158","question":"<p>Khi t\u1ed5ng h\u1ee3p hai l\u1ef1c \u0111\u1ed3ng quy có \u0111\u1ed9 l\u1edbn <span class=\"math-tex\">$F_{1}$<\/span> và <span class=\"math-tex\">$F_{2}$<\/span>thành m\u1ed9t l\u1ef1c có \u0111\u1ed9 l\u1edbn là F thì \u0111\u1ed9 l\u1edbn c\u1ee7a h\u1ee3p l\u1ef1c F:<\/p>","options":["A. luôn nh\u1ecf h\u01a1n l\u1ef1c thành ph\u1ea7n.","B. luôn l\u1edbn h\u01a1n l\u1ef1c thành ph\u1ea7n.","C. luôn b\u1eb1ng l\u1ef1c thành ph\u1ea7n.","D. có th\u1ec3 l\u1edbn h\u01a1n, nh\u1ecf h\u01a1n ho\u1eb7c b\u1eb1ng l\u1ef1c thành ph\u1ea7n."],"correct":"4","level":"1","hint":"<p>F th\u1ecfa mãn: <span class=\"math-tex\">$|F_{1}-F_{2}|\\leq F \\leq F_{1}+F_{2}$<\/span><\/p>","answer":"<p><span style=\"color:#27ae60;\"><strong>Ch\u1ecdn D.<\/strong><\/span><br \/><strong>Ta có F th\u1ecfa mãn: <span class=\"math-tex\">$|F_{1}-F_{2}|\\leq F \\leq F_{1}+F_{2}$<\/span><br \/>nên <span class=\"math-tex\">$F_{min}=F_{1}-F_{2}\\Rightarrow F$<\/span> có th\u1ec3 có \u0111\u1ed9 l\u1edbn nh\u1ecf h\u01a1n l\u1ef1c thành ph\u1ea7n<br \/><span class=\"math-tex\">$F_{max}=F_{1}+F_{2}\\Rightarrow F$<\/span> có th\u1ec3 có \u0111\u1ed9 l\u1edbn l\u1edbn h\u01a1n l\u1ef1c thành ph\u1ea7n.<\/strong><span style=\"color:#27ae60;\"><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"147","test":"0","date":"2022-08-29 09:46:12","option_type":"txt","len":3},{"id":"5210","mon_id":"1158790","chapter_id":"1158796","post_id":"6158","question":"<p>Hai l\u1ef1c thành ph\u1ea7n có \u0111\u1ed9 l\u1edbn l\u1ea7n l\u01b0\u1ee3t là <span class=\"math-tex\">$F_{1}$<\/span> và <span class=\"math-tex\">$F_{2 }$<\/span> , h\u1ee3p l\u1ef1c c\u1ee7a chúng có \u0111\u1ed9 l\u1edbn là F. Ta có<\/p>","options":["A. F luôn l\u1edbn h\u01a1n <span class=\"math-tex\">$F_{1}$<\/span>","B. F luôn nh\u1ecf h\u01a1n <span class=\"math-tex\">$F_{2 }$<\/span>","C. F th\u1ecfa: <span class=\"math-tex\">$|F_{1}-F_{2}|\\leq F \\leq F_{1}+F_{2}$<\/span>","D. F không th\u1ec3 b\u1eb1ng <span class=\"math-tex\">$F_{1}$<\/span>."],"correct":"3","level":"1","hint":"<p>F th\u1ecfa mãn: <span class=\"math-tex\">$|F_{1}-F_{2}|\\leq F \\leq F_{1}+F_{2}$<\/span><\/p>","answer":"<p>Ta có F th\u1ecfa mãn: <span class=\"math-tex\">$|F_{1}-F_{2}|\\leq F \\leq F_{1}+F_{2}$<\/span><br \/>Khi α = 180°, <span class=\"math-tex\">$F_{min}=|F_{1}-F_{2}| \\Rightarrow F$<\/span> có th\u1ec3 có \u0111\u1ed9 l\u1edbn nh\u1ecf h\u01a1n <span class=\"math-tex\">$F_{1}$<\/span> và <span class=\"math-tex\">$F_{2 }$<\/span><br \/>Khi α = 0° <span class=\"math-tex\">$F_{max}=F_{1}+F_{2} \\Rightarrow F$<\/span> có th\u1ec3 có \u0111\u1ed9 l\u1edbn l\u1edbn h\u01a1n <span class=\"math-tex\">$F_{1}$<\/span> và <span class=\"math-tex\">$F_{2 }$<\/span><br \/>Khi α = 120°, F = <span class=\"math-tex\">$F_{1}$<\/span> = <span class=\"math-tex\">$F_{2 }$<\/span><br \/><span style=\"color:#27ae60;\"><strong>V\u1eady \u0111áp án C \u0111úng.<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"147","test":"0","date":"2022-08-29 10:00:16","option_type":"math","len":0}]}