<p class="MsoNormal" style="text-align:justify;"><b><u><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">양력</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">발생원리</span></u></b></p> <p></p> <p class="MsoNormal" style="text-align:justify;"><br></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">다시</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">찾아왔습니다</span>!</p> <p></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">저번에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">과게에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">논란이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">되었던</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">글중에</span></p> <p></p> <p class="MsoNormal" style="text-align:justify;">‘<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">질보단</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">양이지요</span>’<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">라는</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">도배성</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">글</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">들을보고</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">과게에도</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">질좋은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">글이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">많이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">실렸으면</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">하는바람에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">글연재를</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">시작하였습니다</span>. <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">물론</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">제</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">글이</span><span lang="ko"> <font face="Malgun Gothic, sans-serif">부족하기만 하지만</font></span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">그럼에도</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">끝까지</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">읽어주시는분들</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">너무</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">감사합니다</span>!</p> <p></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">오늘은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">저번회에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이어</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">양력</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">발생</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">원리를</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">좀더</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">깊게</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">파볼</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">예정입니다</span>.</p> <p></p> <p class="MsoNormal" style="text-align:justify;"></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">우선</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">저번회에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">질문이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">들어왔던</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">양력공식</span><span lang="ko">을 </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">유도하여</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">기본적인</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">양력의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이해를</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">도운후에</span> Bernoulli’s equation<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">과</span><span lang="ko"> </span>Newton law <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">를</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이용하여</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">보다</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">체감으로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">느낄수있게</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">양력</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">심층분석하겠습니다</span>.</p> <p></p> <p class="MsoNormal" style="text-align:justify;"></p> <div style="text-align:left;"> <div style="text-align:left;"><img src="http://thimg.todayhumor.co.kr/upfile/201601/1452400059c5WnYEa3XDde6QkXNxrw3HELaVOJZrdH.jpg" width="800" height="1067" alt="IMG_1099.JPG" class="chimg_photo" style="border:none;"></div> <div style="text-align:left;"><img src="http://thimg.todayhumor.co.kr/upfile/201601/1452400085PsAa28X2kqbIhcu7WGXorhv.jpg" width="800" height="1067" alt="IMG_1100.JPG" class="chimg_photo" style="border:none;"></div> <div style="text-align:left;"><img src="http://thimg.todayhumor.co.kr/upfile/201601/1452400112Vc2CUOPBSmT.jpg" width="800" height="1067" alt="IMG_1101.JPG" class="chimg_photo" style="border:none;"></div> <div style="text-align:left;"><img src="http://thimg.todayhumor.co.kr/upfile/201601/1452400166mhuZbOGyljGn7q4ABpjCFVSJS2r8.jpg" width="800" height="1067" alt="IMG_1103.JPG" class="chimg_photo" style="border:none;"></div> <div style="text-align:left;"><img src="http://thimg.todayhumor.co.kr/upfile/201601/1452400139pp7fqVLTTUNW6rVWDKKc3.jpg" width="800" height="1067" alt="IMG_1102.JPG" class="chimg_photo" style="border:none;"></div> <div style="text-align:left;"><br></div></div> <p></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">여기까지</span> lift equation<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">살짝</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">다뤄봤습니다</span>.<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이해가</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">어느정도</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">되셨다면</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이제</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">조금</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">더</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">체감적으로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">어떠한</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">방법들이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">비행기가</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">공중에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">뜨게하는지</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">알아보도록</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">하겠습니다</span>.</p> <p></p> <div> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">보통</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">양력을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이해할땐</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">두가지</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">방법을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">혼합하여</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이해합니다</span>. Bernoulli’s equation<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">과</span><span lang="ko"> </span>Newton law<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">를</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이용해서말이지요</span>.</p> <p></p> <p class="MsoNormal" style="text-align:justify;">Bernoulli<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">부터</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">차근차근</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">알아보도록</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">합시다</span>.</p> <p class="MsoNormal" style="text-align:justify;"><br></p> <p></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">기계나</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">항공나오신분들은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">여자친구</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">남자친구이름</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">다음으로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">대학</span> 4<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">년동안</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">입에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">많이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">달고</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">살았을겁니다</span>,Bernoulli. <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">우리의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">친구</span>, <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">위키에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">따르면</span></p> <p></p> <p class="MsoNormal" style="text-align:justify;"><a target="_blank" href="https://ko.wikipedia.org/wiki/%EC%9C%A0%EC%B2%B4_%EB%8F%99%EC%97%AD%ED%95%99" title="유체 동역학" target="_blank"><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#0b0080;">유체</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#0b0080;"> </span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#0b0080;">동역학</span></a><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">에서</span><span class="apple-converted-space"><span style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;"> </span></span><b><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">베르누이</span></b><b><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;"> </span></b><b><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">방정식</span></b><span style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;">(Bernoulli'sequation)</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">은</span><span class="apple-converted-space"><span style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;"> </span></span><a target="_blank" href="https://ko.wikipedia.org/wiki/%EC%9D%B4%EC%83%81_%EC%9C%A0%EC%B2%B4" title="이상 유체" target="_blank"><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#0b0080;">이상</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#0b0080;"> </span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#0b0080;">유체</span></a><span style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;">(ideal fluid)</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">에</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;"></span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">대하여</span><span style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;">,</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">유체에</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;"></span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">가해지는</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;"></span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">일이</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;"></span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">없는</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;"></span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">경우에</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;"></span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">대해</span><span style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;">,</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">유체의</span><span class="apple-converted-space"><span style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;"> </span></span><a target="_blank" href="https://ko.wikipedia.org/wiki/%EC%86%8D%EB%8F%84" title="속도" target="_blank"><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#0b0080;">속도</span></a><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">와</span><span class="apple-converted-space"><span style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;"> </span></span><a target="_blank" href="https://ko.wikipedia.org/wiki/%EC%95%95%EB%A0%A5" title="압력" target="_blank"><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#0b0080;">압력</span></a><span style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;">,<span class="apple-converted-space"> </span></span><a target="_blank" href="https://ko.wikipedia.org/wiki/%EC%9C%84%EC%B9%98_%EC%97%90%EB%84%88%EC%A7%80" title="위치 에너지" target="_blank"><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#0b0080;">위치</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#0b0080;"> </span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#0b0080;">에너지</span></a><span class="apple-converted-space"><span style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;"> </span></span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">사이의</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;"></span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">관계를</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;"></span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">나타낸</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:Arial, sans-serif;color:#252525;"></span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">식이</span><span lang="ko" style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">다</span><span style="font-size:10.5pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;color:#252525;">. <span lang="ko">또한 다음과 같은 가정을 만족시켜야한다</span>.</span></p> <p></p> <p class="MsoNormal" style="margin-bottom:1.2pt;margin-left:19.2pt;text-indent:-18pt;line-height:16.8pt;"><span style="font-size:10pt;font-family:Symbol;color:#252525;">·<span style="font-size:7pt;line-height:normal;font-family:'Times New Roman';">        </span></span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">유체는</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">비압축성이어야</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">한다</span><span style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;">. </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">압력이</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">변하는</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">경우에도</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">밀도는</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">변하지</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">않아야</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">한다</span><span style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;">.</span></p> <p></p> <p class="MsoNormal" style="margin-bottom:1.2pt;margin-left:19.2pt;text-indent:-18pt;line-height:16.8pt;"><span style="font-size:10pt;font-family:Symbol;color:#252525;">·<span style="font-size:7pt;line-height:normal;font-family:'Times New Roman';">        </span></span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">유선이</span><span class="apple-converted-space"><span style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span></span><span style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"><a target="_blank" href="https://ko.wikipedia.org/wiki/%EA%B2%BD%EA%B3%84%EC%B8%B5" title="경계층" target="_blank"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;color:#0b0080;">경계층</span></a>(boundary layer)</span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">을</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">통과하여서는</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">안</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">된다</span><span style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;">.</span></p> <p></p> <p class="MsoNormal" style="margin-bottom:1.2pt;margin-left:19.2pt;text-indent:-18pt;line-height:16.8pt;"><span style="font-size:10pt;font-family:Symbol;color:#252525;">·<span style="font-size:7pt;line-height:normal;font-family:'Times New Roman';">        </span></span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">점성력</span><span style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;">(viscousforce)</span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">이</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">존재하지</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">않아야</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">한다</span><span style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;">.</span></p> <p></p> <p class="MsoNormal" style="margin-bottom:1.2pt;margin-left:19.2pt;text-indent:-18pt;line-height:16.8pt;"><span style="font-size:10pt;font-family:Symbol;color:#252525;">·<span style="font-size:7pt;line-height:normal;font-family:'Times New Roman';">        </span></span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">시간에</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">대한</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">변화가</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">없어야</span><span lang="ko" style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;"> </span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">한다</span><span style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;">(</span><span lang="ko" style="font-size:10.5pt;font-family:'Malgun Gothic', sans-serif;color:#252525;">정상상태</span><span style="font-size:10.5pt;font-family:Arial, sans-serif;color:#252525;">, steady state)</span></p> <p></p> <p class="MsoNormal" style="text-align:justify;"></p> <p> </p> <div style="text-align:left;"><br></div> <div style="text-align:left;"><br></div> <div style="text-align:left;"><br></div> <div style="text-align:left;"><br></div> <div style="text-align:left;"><br></div> <div style="text-align:left;"><img src="http://thimg.todayhumor.co.kr/upfile/201601/1452400286lxkUyDL5f7UZiBKnBQF.jpg" width="800" height="537" alt="1a.jpg" class="chimg_photo" style="border:none;"></div><br><p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">위와</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">같은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">파이프가</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">있다고</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">합시다</span>.<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">입구와</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">출구에서의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">압력과</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">속도</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">그리고</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">위치에너지를</span><span lang="ko"> </span>P1,V1, ρgh1 <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">그리고</span><span lang="ko"> </span>P2,V2, ρgh2<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">라</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">칭하고</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">위에서</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">설명된</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">가정들을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">모두</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">만족시키면</span>, <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">두</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">점</span>(<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">입구와</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">출구</span>)<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">에서</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">다음과</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">같은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">방정식이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">성립됩니다</span>.</p> <p></p><img src="http://thimg.todayhumor.co.kr/upfile/201601/1452400285MRVGbrAROdCB6k.jpg" width="601" height="86" alt="2a.jpg" style="border:none;"><br><p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">여기서</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">중요하게</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">알아볼점은</span>, <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">압력이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">올라가면</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">유체의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">속력은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">내려간고</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">압력이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">내려가면</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">유체의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">속력이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">올라간다입니다</span>. </p> <p></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">비행기의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">날개</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">익형에대해</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">알아본걸</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">다시</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">떠올려</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">보죠</span>. <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">대부분의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">비행기들은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">캠버를</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">갖고</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">있습니다</span>. <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">윗면은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">볼록하고</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">아랫면</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">평평하거나</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">위로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">들어가있죠</span>.</p> <p></p> <p class="MsoNormal" style="text-align:justify;">(<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">참고</span><a target="_blank" href="http://www.todayhumor.co.kr/board/view.php?table=humorbest&no=1184032&s_no=1184032&page=3" target="_blank">http://www.todayhumor.co.kr/board/view.php?table=humorbest&no=1184032&s_no=1184032&page=3</a>)</p> <p></p><img src="http://thimg.todayhumor.co.kr/upfile/201601/1452400285MEGBdIiYSbxauCQ3LqN.jpg" width="800" height="459" alt="3a.jpg" class="chimg_photo" style="border:none;"><br><p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">비행기</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">날개</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">앞으로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">빠른</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">유체가</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">갈라질때</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">위로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">가버린</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">공기는</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">더</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">긴</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">루트를</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">가기때문에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">좀더</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">빠른</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">속도를</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">내야</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">아래로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">가버린</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">공기와</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">같은시간안에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">만난다는</span><span lang="ko"> </span><b>“</b><b><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">원리</span>” </b><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">입니다</span>. <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">그렇기</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">때문에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">아랫면은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">상대적으로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">높은압력을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">갖어</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">낮은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">앞력을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">갖은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">윗면으로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">양력을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">생성시킨다는</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">것입니다</span>.</p> <p></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">하지만</span>! <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이것은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">오류입니다</span>.</p> <p></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">쉽게</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">말해</span>,<b><span lang="ko" style="font-size:12pt;line-height:107%;font-family:'Malgun Gothic', sans-serif;">틀렸습니다, </span></b><b style="font-size:9pt;line-height:1.5;"><span lang="ko" style="line-height:17.12px;font-family:'Malgun Gothic', sans-serif;"><font size="4">틀렸습니다</font></span><span lang="ko" style="font-size:12pt;line-height:17.12px;font-family:'Malgun Gothic', sans-serif;">, </span></b><b style="font-size:9pt;line-height:1.5;"><span lang="ko" style="line-height:17.12px;font-family:'Malgun Gothic', sans-serif;"><font size="5">틀렸습니다</font></span></b><b style="font-size:9pt;line-height:1.5;"><span style="font-size:12pt;line-height:17.12px;">.</span></b></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">흔히</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">긴</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">경로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이론</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">또는</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">동시</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">통과이론으로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">불리는</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이것은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">아마</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">대부분의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">학생들이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">잘못알고있는</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">양력</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">발생이론일</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">것입니다</span>. <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이론이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">오류라는것은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">윈드터널실험으로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">판별되었습니다</span>. </p> <p></p> <div style="text-align:center;"><img src="http://thimg.todayhumor.co.kr/upfile/201601/1452400284MzZrubnhYNgEA41Nx7ej6.jpg" width="360" height="180" alt="4a.jpg" style="font-size:9pt;line-height:1.5;border:none;"></div> <p class="MsoNormal" style="text-align:justify;">(<a target="_blank" href="https://dmiessler.cachefly.net/images/Karman_trefftz.gif" target="_blank">https://dmiessler.cachefly.net/images/Karman_trefftz.gif</a>)</p> <p></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">일정속도로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">파라핀을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">섞은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">유체를</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">윈드터널에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">유입시켜</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">레이져를</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">쏘아</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">흐르는</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">유체를</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">추적하였더니</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">그림과같이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">위와</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">아래로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">갈라진</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">유체는</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">같은시간에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">에어포일</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">꼬리에서</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">만나지</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">않았습니다</span>. <b><strike><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이로써</span> Bernoulli<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">원리는</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">틀렸다고</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">증명이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">되었네요</span>.</strike> <font size="4" style="background-color:#d7e3bc;">(수정/ Bernoulli 원리는 맞습니다, 하지만 Bernoulli를 이용한 긴 경로 이론은 틀렸습니다. 또한, 압력으로 인하여 어느정도의 양력은 발생합니다.</font></b><b style="line-height:1.5;"><font size="4" style="background-color:#d7e3bc;">)</font></b></p> <p></p> <p class="MsoNormal" style="text-align:justify;"></p> <p><br></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">그렇다면</span>, <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">무엇이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">양력을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">발생시킬까요</span>?</p> <p></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">실제로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">하는에서</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">순항중인</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">비행기들은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">상승상태가</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">아닌데도</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">날개의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">에어포일</span>,<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">익형이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">어느정도의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">받음각이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">있습니다</span>. <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">비행기</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">동체가</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">수평을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이룰때의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">받음각을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">우리는</span><span lang="ko"> </span>angle of inclined<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">라</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">부릅니다</span>.</p> <p></p><img src="http://thimg.todayhumor.co.kr/upfile/201601/1452400283v1UnThdStKFvbabKTbGyijFNYHh.jpg" width="800" height="221" alt="5a.jpg" class="chimg_photo" style="border:none;"><br><p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">비행기는</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이륙때부터</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이륙하기전까지는</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">항상</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">받음각이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">존재한다는걸</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">보여줍니다</span>. <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">유체는</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이렇게</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">받음각이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">있는</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">에어포익의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">표면과</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">부딪혀</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">유체의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">흐름방향이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">아래쪽으로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">바꿉니다</span>. (<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">아래</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">그림참조</span>)</p> <p></p> <div style="text-align:center;"><img src="http://thimg.todayhumor.co.kr/upfile/201601/1452400281PbaNTOMi.jpg" width="320" height="240" alt="6a.jpg" style="font-size:9pt;line-height:1.5;border:none;"></div> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">유체의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">속력과</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">방향이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">변하고있는것을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">볼수있습니다</span>. <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이것은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">유체의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">속도가</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">변한다는것을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">보여주고</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">뉴턴의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">가속도법칙에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">따라</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">에어포일로부터</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">힘을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">받는것을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">의미합니다</span>.<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">유체의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">방향이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">아래쪽으로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">바뀜에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">따라</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">뉴턴의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">제</span> 3<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">법칙인</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">작용</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">반작용법칙이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">적용되어</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">반작용에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">의해</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">에어포일이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">위쪽으로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">힘을받고</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이것을</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">우리가</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">그토록</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">찾던</span><span lang="ko"> </span><b>“<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">양력</span>”</b><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">되시겠습니다</span>.</p> <p></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">쉽게</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">정리하면</span>,<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">양력은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">에어포일</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">모양에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">의해</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">흐름이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">바뀐</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">유체의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">반작용때문에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">작용한다고</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">보시면</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">되겠습니다</span>.</p> <p class="MsoNormal" style="text-align:justify;">(<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">참조</span><a target="_blank" href="https://www.grc.nasa.gov/www/k-12/airplane/lift1.html" target="_blank">https://www.grc.nasa.gov/www/k-12/airplane/lift1.html</a>)</p> <p class="MsoNormal" style="text-align:justify;"><br></p> <p class="MsoNormal" style="text-align:justify;"><br></p> <p></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">아까</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">말씀드린</span><span lang="ko"> </span>Bernoulli<span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">원리</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">외에도</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">몇가지</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">양력에</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">대한</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">틀린</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">정보들이</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">있습니다</span>.</p> <p></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">물수제비원리와</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">벤츄리원리입니다</span>. <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">좀</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">더</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">자세히</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">보시고싶은분은</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">아래</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">링크를</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">참고하시길</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">바랍니다</span>.</p> <p></p> <p class="MsoNormal" style="text-align:justify;"><a target="_blank" href="https://www.grc.nasa.gov/www/k-12/airplane/wrong1.html" target="_blank">https://www.grc.nasa.gov/www/k-12/airplane/wrong1.html</a></p> <p></p> <p class="MsoNormal" style="text-align:justify;"><a target="_blank" href="https://www.grc.nasa.gov/www/k-12/airplane/wrong3.html" target="_blank">https://www.grc.nasa.gov/www/k-12/airplane/wrong3.html</a></p> <p></p> <p class="MsoNormal" style="text-align:justify;"><a target="_blank" href="https://www.grc.nasa.gov/www/k-12/airplane/wrong2.html" target="_blank">https://www.grc.nasa.gov/www/k-12/airplane/wrong2.html</a></p> <p></p> <p class="MsoNormal" style="text-align:justify;"></p> <p> </p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">지금까지</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">비행기의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">양력에대해</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">알아보았습니다</span>. <span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">귀한시간</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">내어주셔서</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">또</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">한번</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">감사드립니다</span>!</p> <p></p> <p class="MsoNormal" style="text-align:justify;"><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">다음편엔</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">비행기의</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">엔진으로</span><span lang="ko"> </span><span lang="ko" style="font-family:'Malgun Gothic', sans-serif;">찾아뵙겠습니다</span>!</p> <p class="MsoNormal" style="text-align:justify;"><br></p> <p class="MsoNormal" style="text-align:justify;">----------------------------------------------------</p> <p class="MsoNormal" style="text-align:justify;">비행기에 대해 알아봅시다! [1탄]</p> <p class="MsoNormal" style="text-align:justify;"><a target="_blank" href="http://www.todayhumor.co.kr/board/view.php?table=humorbest&no=1184032&s_no=1184032&page=3" style="color:#0000ff;text-decoration:none;font-family:gulim, Dotum, Helvetica, AppleGothic, sans-serif;line-height:21.6px;">http://www.todayhumor.co.kr/board/view.php?table=humorbest&no=1184032&s_no=1184032&page=3</a><span style="font-family:gulim, Dotum, Helvetica, AppleGothic, sans-serif;line-height:21.6px;">)</span></p> <p></p></div>