{"common":{"save":0,"post_id":"6417","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6257","mon_id":"1158790","chapter_id":"1158865","post_id":"6417","question":"<p>Ch\u1ecdn câu phát bi\u1ec3u \u0111úng nh\u1ea5t?<\/p>","options":["<strong>A.<\/strong> Véc t\u01a1 \u0111\u1ed9ng l\u01b0\u1ee3ng c\u1ee7a h\u1ec7 \u0111\u01b0\u1ee3c b\u1ea3o toàn.","<strong>B<\/strong>. Véc t\u01a1 \u0111\u1ed9ng l\u01b0\u1ee3ng toàn ph\u1ea7n c\u1ee7a h\u1ec7 \u0111\u01b0\u1ee3c b\u1ea3o toàn.","<strong>C<\/strong>. Véc t\u01a1 \u0111\u1ed9ng l\u01b0\u1ee3ng toàn ph\u1ea7n c\u1ee7a h\u1ec7 kín \u0111\u01b0\u1ee3c b\u1ea3o toàn.","<strong>D<\/strong>. \u0110\u1ed9ng l\u01b0\u1ee3ng c\u1ee7a h\u1ec7 kín \u0111\u01b0\u1ee3c b\u1ea3o toàn."],"correct":"3","level":"1","hint":"","answer":"<p>\u0110\u1ecbnh lu\u1eadt b\u1ea3o toàn \u0111\u1ed9ng l\u01b0\u1ee3ng: Véc t\u01a1 \u0111\u1ed9ng l\u01b0\u1ee3ng toàn ph\u1ea7n c\u1ee7a h\u1ec7 kín \u0111\u01b0\u1ee3c b\u1ea3o toàn.<br \/>\u0110áp án \u0111úng: <span style=\"color:#2980b9;\"><strong>C.<\/strong> Véc t\u01a1 \u0111\u1ed9ng l\u01b0\u1ee3ng toàn ph\u1ea7n c\u1ee7a h\u1ec7 kín \u0111\u01b0\u1ee3c b\u1ea3o toàn.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"149","test":"0","date":"2023-02-11 06:51:10","option_type":"txt","len":3},{"id":"6258","mon_id":"1158790","chapter_id":"1158865","post_id":"6417","question":"<p>Phát bi\u1ec3u nào sau \u0111ây là <span style=\"color:#16a085;\">sai<\/span>?<\/p>","options":["<strong>A.<\/strong> Khi không có ngo\u1ea1i l\u1ef1c tác d\u1ee5ng lên h\u1ec7 thì \u0111\u1ed9ng l\u01b0\u1ee3ng c\u1ee7a h\u1ec7 \u0111\u01b0\u1ee3c b\u1ea3o toàn.","<strong>B<\/strong>. V\u1eadt r\u01a1i t\u1ef1 do không ph\u1ea3i là h\u1ec7 kín vì tr\u1ecdng l\u1ef1c tác d\u1ee5ng lên v\u1eadt là ngo\u1ea1i l\u1ef1c.","<strong>C<\/strong>. H\u1ec7 g\u1ed3m "V\u1eadt r\u01a1i t\u1ef1 do và Trái \u0110\u1ea5t" \u0111\u01b0\u1ee3c xem là h\u1ec7 kín khi b\u1ecf qua l\u1ef1c t\u01b0\u01a1ng tác gi\u1eefa h\u1ec7 v\u1eadt v\u1edbi các v\u1eadt khác (M\u1eb7t Tr\u1eddi, các hành tinh).","<strong>D<\/strong>. M\u1ed9t h\u1ec7 g\u1ecdi là h\u1ec7 kín khi ngo\u1ea1i l\u1ef1c tác d\u1ee5ng lên h\u1ec7 không \u0111\u1ed5i."],"correct":"4","level":"1","hint":"<p>M\u1ed9t h\u1ec7 v\u1eadt \u0111\u01b0\u1ee3c g\u1ecdi là h\u1ec7 kín khi:<br \/>- Không có ngo\u1ea1i l\u1ef1c tác d\u1ee5ng lên h\u1ec7 ho\u1eb7c n\u1ebfu có thì các l\u1ef1c \u1ea5y cân b\u1eb1ng nhau.<br \/>- Ch\u1ec9 có các n\u1ed9i l\u1ef1c t\u01b0\u01a1ng tác gi\u1eefa các v\u1eadt.<br \/>- N\u1ebfu trong quá trình t\u01b0\u01a1ng tác, các n\u1ed9i l\u1ef1c xu\u1ea5t hi\u1ec7n l\u1edbn h\u01a1n các ngo\u1ea1i l\u1ef1c r\u1ea5t nhi\u1ec1u thì có th\u1ec3 b\u1ecf qua các ngo\u1ea1i l\u1ef1c và coi h\u1ec7 là kín,<\/p>","answer":"<p>A, B, C – \u0111úng.<br \/>D – sai, m\u1ed9t h\u1ec7 \u0111\u01b0\u1ee3c g\u1ecdi là kín khi không có ngo\u1ea1i l\u1ef1c tác d\u1ee5ng lên h\u1ec7 ho\u1eb7c n\u1ebfu có thì các l\u1ef1c \u0111ó cân b\u1eb1ng nhau.<br \/>\u0110áp án \u0111úng: <span style=\"color:#2980b9;\"><strong>D.<\/strong> M\u1ed9t h\u1ec7 g\u1ecdi là h\u1ec7 kín khi ngo\u1ea1i l\u1ef1c tác d\u1ee5ng lên h\u1ec7 không \u0111\u1ed5i.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"149","test":"0","date":"2023-02-11 06:52:57","option_type":"txt","len":3},{"id":"6259","mon_id":"1158790","chapter_id":"1158865","post_id":"6417","question":"<p>Va ch\u1ea1m nào sau \u0111ây là va ch\u1ea1m m\u1ec1m?<\/p>","options":["<strong>A.<\/strong> Qu\u1ea3 bóng \u0111ang bay \u0111\u1eadp vào t\u01b0\u1eddng và n\u1ea3y ra.","<strong>B<\/strong>. Viên \u0111\u1ea1n \u0111ang bay xuyên vào và n\u1eb1m g\u1ecdn trong bao cát.","<strong>C<\/strong>. Viên \u0111\u1ea1n xuyên qua m\u1ed9t t\u1ea5m bia trên \u0111\u01b0\u1eddng bay c\u1ee7a nó.","<strong>D.<\/strong> Qu\u1ea3 bóng tennis \u0111\u1eadp xu\u1ed1ng sân thi \u0111\u1ea5u."],"correct":"2","level":"1","hint":"<p>- Va ch\u1ea1m m\u1ec1m là tr\u01b0\u1edbc va ch\u1ea1m hai v\u1eadt riêng bi\u1ec7t và sau va ch\u1ea1m thì dính vào nhau chuy\u1ec3n \u0111\u1ed9ng v\u1edbi cùng v\u1eadn t\u1ed1c.<br \/>- Va ch\u1ea1m \u0111àn h\u1ed3i là tr\u01b0\u1edbc va ch\u1ea1m hai v\u1eadt riêng bi\u1ec7t và sau va ch\u1ea1m hai v\u1eadt c\u0169ng chuy\u1ec3n \u0111\u1ed9ng riêng bi\u1ec7t.<br \/><br \/> <\/p>","answer":"<p>A, C, D – va ch\u1ea1m \u0111àn h\u1ed3i.<br \/>B – va ch\u1ea1m m\u1ec1m.<br \/>\u0110áp án \u0111úng: <span style=\"color:#2980b9;\"><strong>B. <\/strong>Viên \u0111\u1ea1n \u0111ang bay xuyên vào và n\u1eb1m g\u1ecdn trong bao cát.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"149","test":"0","date":"2023-02-11 06:54:28","option_type":"txt","len":3}]}