{"id":230,"date":"2013-09-24T10:14:42","date_gmt":"2013-09-24T10:14:42","guid":{"rendered":"https:\/\/blogs.ua.es\/ffic\/?p=230"},"modified":"2013-09-25T15:11:51","modified_gmt":"2013-09-25T15:11:51","slug":"oscil%c2%b7lacions-i-ones-2","status":"publish","type":"post","link":"https:\/\/blogs.ua.es\/ffic\/2013\/09\/24\/oscil%c2%b7lacions-i-ones-2\/","title":{"rendered":"Tema 2. Oscil\u00b7lacions i ones (II)"},"content":{"rendered":"<p style=\"text-align: justify\">En aquesta sessi\u00f3 continuem analitzant el moviment oscil\u00b7latori, per\u00f2 tractarem de la <strong>f\u00edsica de les ones<\/strong>. Les ones viatgen per diversos medis materials com ara l&#8217;aire, l&#8217;aigua, la terra, i tamb\u00e9 per l&#8217;espai on no hi ha cap medi material per a propagar-se. Les <strong>ones<\/strong> <strong>transporten<\/strong> <strong>energia i moment lineal<\/strong>, per\u00f2 <strong>no<\/strong> transporten <strong>mat\u00e8ria<\/strong>. Algunes <strong>aplicacions<\/strong> pr\u00e0ctiques del coneixement del moviment ondulatori s\u00f3n els <strong>radars<\/strong> de la policia, amb els quals &#8220;cacen&#8221;\u00a0 a les persones que circulen amb exc\u00e9s de velocitat, o els <strong>comandaments<\/strong> a dist\u00e0ncia, amb els quals podem canviar els canals de televisi\u00f3, r\u00e0dio o obrir portes de garatge. Els equipaments sonogr\u00e0fics, que utilitzen <strong>ones ultras\u00f2niques<\/strong>, aplicats a la <strong>medicina<\/strong> permeten obtenir imatges del fetus a l&#8217;\u00fater de la mare. Entendre com actuen les ones en pres\u00e8ncia d&#8217;obstacles ajuda a <strong>dissenyar<\/strong> els <strong>auditoris<\/strong> per a tenir la millor ac\u00fastica possible. El <strong>resum en castell\u00e0<\/strong> d&#8217;aquesta sessi\u00f3 la podeu consultar <strong><span style=\"text-decoration: underline\"><a href=\"https:\/\/blogs.ua.es\/ffic\/programa\/tema-2\/\">ac\u00ed<\/a><\/span><\/strong>.<\/p>\n<p style=\"text-align: justify\">En aquesta sessi\u00f3 tractarem el moviment ondulatori simple, distingint entre ones longitudinals i transversals, i estudiarem les ones peri\u00f2diques, especialment les <strong>ones harm\u00f2niques<\/strong>. Obtindrem l&#8217;expressi\u00f3 matem\u00e0tica, una equaci\u00f3 diferencial, que s&#8217;anomena <strong>equaci\u00f3 d&#8217;ona<\/strong>, i la soluci\u00f3 general de la qual \u00e9s precisament la <strong>funci\u00f3 d&#8217;ona<\/strong>. Tamb\u00e9 veurem com es mouen les ones en dues i tres dimensions i analitzarem l&#8217;energia del moviment ondulatori, la interfer\u00e8ncia d&#8217;ones harm\u00f2niques i les ones estacion\u00e0ries.<\/p>\n<p style=\"text-align: justify\">&#8220;<a href=\"http:\/\/www.learner.org\/resources\/series42.html\"><strong>L&#8217;Univers Mec\u00e0nic i m\u00e9s Enll\u00e0<\/strong><\/a>&#8221; \u00e9s una s\u00e8rie de 52 v\u00eddeos produ\u00efdes pel <em><a href=\"http:\/\/eas.caltech.edu\/\">California Institute of Technology<\/a> and Intelecom<\/em> en 1985 i presentada pel <strong>Professor <a href=\"http:\/\/www.its.caltech.edu\/~dg\/\">David L.\u00a0 Goodstein<\/a><\/strong>. YouTube permet la visi\u00f3 d&#8217;alguns cap\u00edtols d&#8217;aquest curs en castell\u00e0, encara que els drets d&#8217;autor poden prohibir la seua emissi\u00f3. A continuaci\u00f3 podeu trobar la sessi\u00f3 corresponent a les ones.<\/p>\n<p style=\"text-align: justify\"><code>[kml_flashembed movie=\"http:\/\/www.youtube.com\/v\/JNCaPqwNbbI\" width=\"640\" height=\"480\" wmode=\"transparent\" \/]<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"<p>En aquesta sessi\u00f3 continuem analitzant el moviment oscil\u00b7latori, per\u00f2 tractarem de la f\u00edsica de les ones. Les ones viatgen per diversos medis materials com ara l&#8217;aire, l&#8217;aigua, la terra, i tamb\u00e9 per l&#8217;espai on no hi ha cap medi material &hellip; <a href=\"https:\/\/blogs.ua.es\/ffic\/2013\/09\/24\/oscil%c2%b7lacions-i-ones-2\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2285,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9319,1366],"tags":[9330,1580705],"class_list":["post-230","post","type-post","status-publish","format-standard","hentry","category-asignatura-2","category-temas","tag-asignatura-3","tag-temas"],"_links":{"self":[{"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/posts\/230","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/users\/2285"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/comments?post=230"}],"version-history":[{"count":16,"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/posts\/230\/revisions"}],"predecessor-version":[{"id":472,"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/posts\/230\/revisions\/472"}],"wp:attachment":[{"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/media?parent=230"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/categories?post=230"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.ua.es\/ffic\/wp-json\/wp\/v2\/tags?post=230"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}