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[킹앤카&킹앤포&킹앤유] [카6] 구멍 난 생수병을 채워라!
수학동아 2019.11.08 18:18 조회 1221

[킹앤카 11월호] 안녕하세요 수학동아입니다.

카이스트 수학문제연구회가 직접 출제하는 퀴즈킹앤카이스트 문제를 풀어보세요!

퀴즈에 참여해주신 분 중 추첨을 통해 선물을 드립니다.

한 문제만 풀어도 좋으니 여러분의 풀이를 보여주세요!

킹앤카 문제 풀이에 참여하고 싶은 분은 이 포스트의 비밀댓글로 이름, 연락처, 주소와 함께 풀이를 남겨주세요 ^^

 

 

수리논술문제)

터진 물통의 구멍으로 초당 4ml의 물이 새어나오고 있다. 물을 받기 시작한 지 약 2분 30초가 지나서 물병을 확인한 장건이는 텅 빈 물통을 보고 깜짝 놀란다. 이때 정수기에서 물은 몇 ml/s로 나오고 있었을까? 단, 물이 새기 시작한 시점과 장건이가 물을 받기 시작한 시간이 같다고 가정한다.

 

QUIZ 1)

어쩔 수 없이 장건이와 의진이는 물 대신 캔 음료수를 사러 간다. 반지름 5cm, 높이 12cm의 작은 원기둥 모양의 음료수 캔을 보고 장건이는 양이 적다며 슬퍼한다. 만약 2cm를 더 늘릴 수 있다면 이를 반지름과 높이 중 어느 쪽을 늘리는 데 써야 더 많은 음료수를 먹을 수 있을까? 단, 원주율 π는 3으로 계산하자.

 

QUIZ 2)

음료수 캔의 반지름이 R, 높이가 4R이라고 하자. 높이를 2만큼 줄였을 때보다 반지름을 2만큼 줄였을 때 담을 수 있는 음료의 양이 더 많을 때, R 값의 범위를 부등호를 이용해서 나타내보자.

 

풀이는 이름/연락처/주소와 함께 비밀댓글로 달아주세요!

 

  •  
    쇼니 Lv.1 2019.11.08 20:49 비밀댓글
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    이과생 Lv.6 2019.11.09 23:47 비밀댓글
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  •  
    K→C≡N Lv.11 2019.11.10 01:48

    수리논술문제를 풀려면 페트병에 물이 얼만큼 들어있었는지 알아야하지않나요?

    댓글 작성하기 좋아요1 댓글수0
  •  
    K-RIEMANN Lv.10 2019.11.14 02:19 비밀댓글
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    RH Lv.7 2019.11.17 23:13 비밀댓글
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    아인수타인 Lv.12 2019.11.20 18:52 비밀댓글

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    Function: view

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
    Line: 558
    Function: view

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/index.php
    Line: 315
    Function: require_once

    A PHP Error was encountered

    Severity: Warning

    Message: mkdir(): Permission denied

    Filename: libraries/Common.php

    Line Number: 202

    Backtrace:

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
    Line: 202
    Function: mkdir

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
    Line: 236
    Function: getLatexImg

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/views/ver3/inc/view_comment_list.php
    Line: 90
    Function: parseLatexImg

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/views/ver3/inc/view.php
    Line: 343
    Function: view

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
    Line: 558
    Function: view

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/index.php
    Line: 315
    Function: require_once

    A PHP Error was encountered

    Severity: Warning

    Message: file_put_contents(/DATA/upload/polymath/latex/4c3d556532418277f92ea2dce8400951.gif): failed to open stream: No such file or directory

    Filename: libraries/Common.php

    Line Number: 213

    Backtrace:

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
    Line: 213
    Function: file_put_contents

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
    Line: 236
    Function: getLatexImg

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/views/ver3/inc/view_comment_list.php
    Line: 90
    Function: parseLatexImg

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/views/ver3/inc/view.php
    Line: 343
    Function: view

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
    Line: 558
    Function: view

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/index.php
    Line: 315
    Function: require_once

    A PHP Error was encountered

    Severity: Warning

    Message: mkdir(): Permission denied

    Filename: libraries/Common.php

    Line Number: 202

    Backtrace:

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
    Line: 202
    Function: mkdir

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
    Line: 236
    Function: getLatexImg

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/views/ver3/inc/view_comment_list.php
    Line: 90
    Function: parseLatexImg

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/views/ver3/inc/view.php
    Line: 343
    Function: view

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
    Line: 558
    Function: view

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/index.php
    Line: 315
    Function: require_once

    A PHP Error was encountered

    Severity: Warning

    Message: file_put_contents(/DATA/upload/polymath/latex/ad3764f8931f043ffc8deca757ded9c8.gif): failed to open stream: No such file or directory

    Filename: libraries/Common.php

    Line Number: 213

    Backtrace:

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
    Line: 213
    Function: file_put_contents

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
    Line: 236
    Function: getLatexImg

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/views/ver3/inc/view_comment_list.php
    Line: 90
    Function: parseLatexImg

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/views/ver3/inc/view.php
    Line: 343
    Function: view

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
    Line: 558
    Function: view

    File: /volume1/web/PhpstormProjects/www_polymath_co_kr/index.php
    Line: 315
    Function: require_once

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