{"id":8214,"date":"2008-10-19T12:47:00","date_gmt":"2008-10-19T12:47:00","guid":{"rendered":"http:\/\/melotopia.net\/b\/?p=8214"},"modified":"2008-10-19T12:47:00","modified_gmt":"2008-10-19T12:47:00","slug":"%ec%9e%ac%eb%af%b8%eb%82%9c-%eb%86%80%ec%9d%b4%ea%b8%b0%ea%b5%ac","status":"publish","type":"post","link":"http:\/\/melotopia.net\/b\/?p=8214","title":{"rendered":"\uc7ac\ubbf8\ub09c \ub180\uc774\uae30\uad6c"},"content":{"rendered":"<div class=\"desc\">\n        Vortx\ub77c\ub294 \ub180\uc774\uae30\uad6c\uac00 \uc788\ub2e4.<br \/>\n        <br \/>\n        http:\/\/www.teachersource.com\/Energy\/FantasticRides\/TheVortx.aspx<br \/>\n        <br \/>\n        \ucc38\uace0\ub85c \uc774 \uae30\uad6c\uc758 \uc880 \ucee4\ub2e4\ub780 \ubc84\uc804\uc740 \ud61c\ud654\ub3d9\uc5d0 \uc788\ub294 \uad6d\ub9bd\uc11c\uc6b8\uacfc\ud559\uad00\uc5d0 \uc804\uc2dc\ub418\uc5b4 \uc788\ub2e4. \uc2e4\uc81c\ub85c \uc2e4\ud5d8\uc744 \ud574\ubcfc \uc218\ub3c4 \uc788\ub2e4.<\/p>\n<p>\n        \uc704\uc5d0\uc11c \ub3d9\uc804\uc744 \uad74\ub824\uc8fc\uba74 \uae54\ub54c\uae30\ub97c \ud0c0\uace0 \uac00\uc7a5\uc790\ub9ac\ub97c \ub3cc\ub2e4\uac00 \uc810\uc810 \uc18d\ub3c4\uac00 \uc904\uc5b4\ub4e4\uc5b4\uc11c \uac00\uc6b4\ub370\ub85c \ube60\uc838\ub4e4\uc5b4\uac00\ub294 \uac70\ub2e4.<\/p>\n<p>        \uc774\uac78 \ucd08\ub4f1\ud559\uad50 5\ud559\ub144 \uc560\ub4e4\uc5d0\uac8c \ubd84\uc11d\ud558\ub77c\uace0 \uc2dc\ud0a4\ub294, \ub300\ucda9 \uadf8\ub7f0 \ub290\ub08c\uc758 \uad50\uc7ac\ub97c \uac1c\ubc1c\ud558\ub294\ub370&#8230;<\/p>\n<p>        \uc790. \ub098\uc758 \uc784\ubb34\ub294 \uc774\uac83\uc744 \ubb3c\ub9ac\uc801\uc73c\ub85c \ubd84\uc11d\ud574\uc11c, \ub3d9\uc804\uc774 \ub5a8\uc5b4\uc9c0\uc9c0 \uc54a\ub3c4\ub85d \ud558\ub824\uba74 \uc5b4\ub5bb\uac8c \ud574\uc57c \ud558\ub294\uc9c0\ub97c \uc54c\uc544\ub0b4\uc57c \ud55c\ub2e4.<br \/>\n        <br \/>\n        \ub3d9\uc804\uc774 \ub5a8\uc5b4\uc9c0\ub294 \uc774\uc720\ub294? \ub2f9\uc5f0\ud788 \ub9c8\ucc30\ub825 \ub54c\ubb38\uc774\ub2e4. \ub9cc\uc57d \ub9c8\ucc30\uc774 \uc5c6\ub2e4\uba74 \ub192\uc774\ub294 \ubcc0\ud560\uc9c0 \ubab0\ub77c\ub3c4 \uc801\ub2f9\ud55c \uada4\ub3c4\ub97c \uadf8\ub9ac\uba70 \uc798 \ub3cc\uc544\uac08 \uac83\uc774\ub2e4.<\/p>\n<p>        \uadf8\ub7fc, \uc5d0\ub108\uc9c0\ub97c \uc368 \ubcf4\uc790.<br \/>\n        <br \/>\n        $E=T+U$<br \/>\n        <br \/>\n        \uc6b4\ub3d9\uc5d0\ub108\uc9c0 $T$\ub294<br \/>\n        <br \/>\n        $T=\\frac{1}{2}m (r^2 \\dot(\\theta)^2 +\\dot{r}^2 + \\dot{z}^2)$<br \/>\n        <br \/>\n        \uc704\uce58\uc5d0\ub108\uc9c0 $U$\ub294<br \/>\n        <br \/>\n        $U=mgz$<br \/>\n        <br \/>\n        \uc5ec\uae30\uc11c $z$\ub294 \uc704\ucabd \ubc29\ud5a5, $r$\uc740 \ud68c\uc804\ucd95\uc5d0\uc11c \ub098\uac00\ub294 \ubc29\ud5a5, $\\theta$\ub294 \uc704\uc5d0\uc11c \ubcf4\uc558\uc744 \ub54c \ubc18\uc2dc\uacc4\ubc29\ud5a5\uc73c\ub85c \ud68c\uc804\ud558\ub294 \ubc29\ud5a5\uc774\ub2e4.<\/p>\n<p>        \ub9c8\ucc30\uc774\ub77c\ub294 \uac83\uc740 \uc6d0\ub798\ub294 \ubcf4\uc874\ub418\uc5c8\uc5b4\uc57c \ud560 \uc5d0\ub108\uc9c0\uc778 $E$\ub97c \uc904\uc774\ub294 \uc5ed\ud560\uc744 \ud55c\ub2e4. \uc77c\ub2e8 \uc9c8\ub7c9 $m$\uc740 \ubd88\ubcc0\uc774\ub77c\uace0 \uce58\uc790. \uadf8\ub7fc, \uc904\uc5b4\ub4dc\ub294 $E$\ub97c \ubcf4\uc804\ud574 \uc8fc\ub824\uba74 \uc6b4\ub3d9\uc5d0\ub108\uc9c0\ub098 \uc704\uce58\uc5d0\ub108\uc9c0 \uc911\uc758 \ud558\ub098, \ub610\ub294 \ub458 \ub2e4\ub97c \ub298\ub824\uc918\uc57c \ud55c\ub2e4. \uac00\uc7a5 \uc26c\uc6b4 \ubc29\ubc95\uc740 \uc704\uce58\uc5d0\ub108\uc9c0 $U$\ub97c \ub298\ub9ac\ub294 \uac83\uc774\ub2e4. \uc5b4\ub5bb\uac8c? \uc911\ub825\uac00\uc18d\ub3c4 $g$\ub97c \uc778\uc704\uc801\uc73c\ub85c \ud0a4\uc6cc\uc904 \uc218 \uc788\uae30 \ub54c\ubb38\uc774\ub2e4. \uadf8\uc800 \uc704\ub85c \ud655 \ub4e4\uc5b4\uc62c\ub9ac\uba74 \ub41c\ub2e4.<\/p>\n<p>        \ub2e4\uc2dc \uc6d0\ub798\ub300\ub85c \uc804\uccb4 \uc5d0\ub108\uc9c0\uac00 \ub418\ub3cc\uc544 \uac00\uac8c \ub418\uba74, \uc6b4\ub3d9\uc5d0\ub108\uc9c0\uc640 \uc704\uce58\uc5d0\ub108\uc9c0\ub294 \uc11c\ub85c \ubcc0\ud658\ub418\uba74\uc11c \uc6d0\ub798\uc758 \uada4\ub3c4\ub97c \ub9cc\ub4e4\uc5b4 \uc904 \uac83\uc774\ub2e4.<\/p>\n<p>        \ub450\ubc88\uc9f8 \ubb38\uc81c\ub294, \uc2dc\uac04\uc774 \uc9c0\ub0a8\uc5d0 \ub530\ub77c \ud68c\uc804 \uc18d\ub3c4\ub97c \uc54c\uc544\ub0b4\uc57c \ud55c\ub2e4\ub294 \uac83\uc774\ub2e4.<\/p>\n<p>        \uc774\ubc88\uc5d4, \uc5d0\ub108\uc9c0\uac00 \uc904\uc5b4\ub4e4\uac8c \ub418\ub294 \ubb38\uc81c\ub97c \uc0dd\uac01\ud574 \ubcf4\uc790. \uac00\ub9cc\ud788 \ub194\ub450\uba74 \uc2dc\uac04\uc774 \uc9c0\ub0a8\uc5d0 \ub530\ub77c \uc804\uccb4 \uc5d0\ub108\uc9c0\uac00 \uc904\uc5b4\ub4e0\ub2e4. \uadf8\ub7fc \uc5b4\ucc28\ud53c \uc6b4\ub3d9\uc5d0\ub108\uc9c0\uc640 \uc704\uce58\uc5d0\ub108\uc9c0\ub294 \uc11c\ub85c \ubcc0\ud658\ub418\ubbc0\ub85c, \uc704\uce58\uc5d0\ub108\uc9c0\uac00 \ucd5c\uc800\uc778 \uc0c1\ud0dc\uc5d0\uc11c\uc758 \ud68c\uc804 \uc18d\ub825\uc744 \uc0dd\uac01\ud574 \ubcf4\uc790. \uadf8\ub7f0\ub370, \uc804\uccb4\uc801\uc73c\ub85c\ub294 \uc5d0\ub108\uc9c0\uac00 \uc904\uc5b4\ub4e4\uc9c0\ub9cc, \uc18d\ub825\uc774 \uc904\uc5b4\ub4e4\uc5b4\uc11c \uc544\ub798\ucabd\uc73c\ub85c \ub0b4\ub824\uc624\uac8c \ub418\uba74 \ubc18\uc9c0\ub984\uc774 \uc791\uc544\uc9c4\ub2e4. \ubc18\uc9c0\ub984\uc774 \uc791\uc544\uc9c0\uba74 \uad6c\uc2ec\ub825\uc744 \uc720\uc9c0\ud558\uae30 \uc704\ud574\uc11c\ub294 \uc880 \ub354 \ube60\ub978 \uc18d\ub825\uc73c\ub85c \uc6c0\uc9c1\uc5ec\uc57c \ud55c\ub2e4. \ub530\ub77c\uc11c \ud68c\uc804 \uc18d\ub3c4\ub294 \uc810\uc810 \ube68\ub77c\uc9c0\uac8c \ub41c\ub2e4.<\/p>\n<p>        \uc774 \ubb38\uc81c\ub97c Analytic\ud558\uac8c \ud480\uc5b4\ubcf4\ub824\uace0 \ud588\ub294\ub370, 2\ucc28 \ube44\uc120\ud615 \uc0c1\ubbf8\ubd84 \ubc29\uc815\uc2dd\uc774 \ub4f1\uc7a5\ud558\ub294 \ubc14\ub78c\uc5d0 \ud480 \uc218\uac00 \uc5c6\uc5c8\ub2e4. Numerical\ud558\uac8c \ud480\uc5b4\ubcfc \uc218\ub3c4 \uc788\uae34 \ud558\uaca0\uc9c0\ub9cc \uc2dc\uac04\uc774 \uc5c6\ub2e4. \ub2e4\uc74c \uae30\ud68c\uc5d0&#8230;<br \/>\n        <\/p>\n<div style=\"width:100%;margin-top:30px;clear:both;height:30px\">\n<div style=\"width:31px;float:left;\">\n<a href=\"\/toolbar\/popup\/abuseReport\/?entryId=1017\" onclick=\"window.open(this.href, 'tistoryThisBlogPopup', 'width=550, height=510, toolbar=no, menubar=no, status=no, scrollbars=no'); return false;\"><br \/>\n<img data-recalc-dims=\"1\" decoding=\"async\" alt=\"\uc2e0\uace0\" src=\"https:\/\/i0.wp.com\/t1.daumcdn.net\/tistory_admin\/static\/ico\/ico_spam_report.png\" style=\"border:0\"\/><br \/>\n<\/a>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Vortx\ub77c\ub294 \ub180\uc774\uae30\uad6c\uac00 \uc788\ub2e4. http:\/\/www.teachersource.com\/Energy\/FantasticRides\/TheVortx.aspx \ucc38\uace0\ub85c \uc774 \uae30\uad6c\uc758 \uc880 \ucee4\ub2e4\ub780 \ubc84\uc804\uc740 \ud61c\ud654\ub3d9\uc5d0 \uc788\ub294 \uad6d\ub9bd\uc11c\uc6b8\uacfc\ud559\uad00\uc5d0 \uc804\uc2dc\ub418\uc5b4 \uc788\ub2e4. \uc2e4\uc81c\ub85c \uc2e4\ud5d8\uc744 \ud574\ubcfc \uc218\ub3c4 \uc788\ub2e4. \uc704\uc5d0\uc11c \ub3d9\uc804\uc744 \uad74\ub824\uc8fc\uba74 \uae54\ub54c\uae30\ub97c \ud0c0\uace0 \uac00\uc7a5\uc790\ub9ac\ub97c \ub3cc\ub2e4\uac00 \uc810\uc810 \uc18d\ub3c4\uac00 \uc904\uc5b4\ub4e4\uc5b4\uc11c \uac00\uc6b4\ub370\ub85c \ube60\uc838\ub4e4\uc5b4\uac00\ub294 \uac70\ub2e4. \uc774\uac78 \ucd08\ub4f1\ud559\uad50 5\ud559\ub144 \uc560\ub4e4\uc5d0\uac8c \ubd84\uc11d\ud558\ub77c\uace0 \uc2dc\ud0a4\ub294, \ub300\ucda9 \uadf8\ub7f0 \ub290\ub08c\uc758 \uad50\uc7ac\ub97c \uac1c\ubc1c\ud558\ub294\ub370&#8230; \uc790. \ub098\uc758 \uc784\ubb34\ub294 \uc774\uac83\uc744 \ubb3c\ub9ac\uc801\uc73c\ub85c \ubd84\uc11d\ud574\uc11c, \ub3d9\uc804\uc774 \ub5a8\uc5b4\uc9c0\uc9c0 \uc54a\ub3c4\ub85d \ud558\ub824\uba74 \uc5b4\ub5bb\uac8c [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-8214","post","type-post","status-publish","format-standard","hentry","category-academic"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8o6gA-28u","jetpack-related-posts":[],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/8214","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8214"}],"version-history":[{"count":0,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/8214\/revisions"}],"wp:attachment":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8214"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8214"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}