Tốc độ chuyển động - Bài tập trung bình

Home Lớp 7 Khoa học tự nhiên 7 - Sách kết nối tri thức Bài 8: Tốc độ chuyển độngBài tập trung bình

{"common":{"save":0,"post_id":"5995","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"9368","post_id":"5995","mon_id":"1158739","chapter_id":"1158740","question":"Ch\u1ecdn s\u1ed1 thích h\u1ee3p \u0111i\u1ec1n vào ch\u1ed7 tr\u1ed1ng:<\/p>\u0110\u1ed5i: 15 m\/s = <input class=\"_tit_hoi\" disabled=\"disabled\" type=\"text\"\/> km\/h<\/p>","options":["A. 15 km\/h. ","B. 36 km\/h. ","C. 54 km\/h. ","D. 45 km\/h."],"correct":"3","level":"2","hint":"1 m\/s = 3,6 km\/h  <\/p>","answer":"1 m\/s = 3,6 km\/h, nên:<\/p>15 m\/s = 15 . 3,6 = 54 km\/h<\/p>\u0110a\u0301p a\u0301n \u0111u\u0301ng: C. 54 km\/h.    <\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"147","test":"0","date":"2022-08-20 05:04:48","option_type":"txt","len":2},{"id":"9369","post_id":"5995","mon_id":"1158739","chapter_id":"1158740","question":"Ba\u0323n H\u01b0\u01a1ng \u0111\u1ea1p xe t\u1eeb nhà \u0111\u1ebfn tr\u01b0\u1eddng m\u1ea5t 7 min, bi\u1ebft t\u1ed1c \u0111\u1ed9 c\u1ee7a H\u01b0\u01a1ng là 3 m\/s. Tính quãng \u0111\u01b0\u1eddng t\u1eeb nhà H\u01b0\u01a1ng \u0111\u1ebfn tr\u01b0\u1eddng?<\/p>","options":["A. 1206 m.","B. 1,26 m."," \nC. 12,6 km.","D. 1,26 km."],"correct":"4","level":"2","hint":"G\u01a1\u0323i y\u0301: S\u01b0\u0309 du\u0323ng công th\u01b0\u0301c s = v.t. Theo \u0111ê\u0300 ba\u0300i co\u0301: t = 7 phút = 7.60 = 420 s; v = 3 m\/s.<\/p>","answer":"L\u1eddi gi\u1ea3i Quãng \u0111\u01b0\u1eddng t\u1eeb nhà H\u01b0\u01a1ng \u0111\u1ebfn tr\u01b0\u1eddng là s = v. t = 3 . 420 =  1260 m = 1,26 km \u0110a\u0301p a\u0301n \u0111u\u0301ng: D. 1,26 km.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"147","test":"0","date":"2022-08-20 05:06:46","option_type":"txt","len":1},{"id":"9370","post_id":"5995","mon_id":"1158739","chapter_id":"1158740","question":"T\u1ea1i mô\u0323t cuô\u0323c thi cha\u0323y \u01a1\u0309 tr\u01b0\u01a1\u0300ng, ba\u0323n Nguyê\u0303n Ph\u01b0\u01a1ng Liên \u0111a\u0303 \u0111oa\u0323t gia\u0309i nhâ\u0301t \u01a1\u0309 c\u1ef1 li 60 m trong 8,93 s. T\u1ed1c \u0111\u1ed9 mà ba\u0323n Liên \u0111ã \u0111\u1ea1t \u0111\u01b0\u1ee3c trong cu\u1ed9c thi là:<\/p>","options":["A. 7,61 m\/s.","B. 6,72 m\/s.","C. 7,16 m\/s.","D. 6,27 m\/s."],"correct":"2","level":"2","hint":"S\u01b0\u0309 du\u0323ng công th\u01b0\u0301c $v = \\frac{s}{t}$<\/span> . Theo \u0111ê\u0300 ba\u0300i co\u0301: s = 60 m, t = 8,93s<\/p>","answer":"T\u1ed1c \u0111\u1ed9 mà ba\u0323n Liên \u0111ã \u0111\u1ea1t \u0111\u01b0\u1ee3c trong cu\u1ed9c thi là<\/p> $v = \\frac{s}{t}=\\frac{60}{8,93}\\approx 6,72 m\/s$<\/span><\/span><\/p>\u0110a\u0301p a\u0301n \u0111u\u0301ng: B. 6,72 m\/s.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"147","test":"0","date":"2022-08-20 05:12:49","option_type":"txt","len":1}]}