{"id":746,"date":"2020-07-22T17:33:59","date_gmt":"2020-07-22T19:33:59","guid":{"rendered":"https:\/\/sites.usp.br\/projetocecilia\/?page_id=746"},"modified":"2025-04-17T11:44:12","modified_gmt":"2025-04-17T13:44:12","slug":"s1-04","status":"publish","type":"page","link":"https:\/\/sites.usp.br\/projetocecilia\/s1-04\/","title":{"rendered":"Geomagnetismo e B\u00fassola Caseira"},"content":{"rendered":"<div id=\"pl-746\" class=\"panel-layout\">\n<div id=\"pg-746-0\" class=\"panel-grid panel-no-style\" data-style=\"{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;,&quot;cell_alignment&quot;:&quot;flex-start&quot;}\" data-ratio=\"1\" data-ratio-direction=\"right\">\n<div id=\"pgc-746-0-1\" class=\"panel-grid-cell panel-grid-cell-mobile-last\" data-weight=\"0.84\">\n<div id=\"panel-746-0-1-0\" class=\"so-panel widget widget_sow-editor panel-first-child\" data-index=\"0\" data-style=\"{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;}\">\n<div class=\"so-widget-sow-editor so-widget-sow-editor-base\">\n<div class=\"siteorigin-widget-tinymce textwidget\">\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1243 size-full\" src=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2021\/07\/Separador.png\" alt=\"\" width=\"560\" height=\"50\" srcset=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2021\/07\/Separador.png 560w, https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2021\/07\/Separador-300x27.png 300w, https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2021\/07\/Separador-400x36.png 400w\" sizes=\"auto, (max-width: 560px) 100vw, 560px\" \/><\/p>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"panel-746-0-1-1\" class=\"so-panel widget widget_sow-editor\" data-index=\"1\" data-style=\"{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;}\">\n<div class=\"so-widget-sow-editor so-widget-sow-editor-base\">\n<div class=\"siteorigin-widget-tinymce textwidget\">\n<p style=\"font-family: Comfortaa, serif;\">Hoje \u00e9 dia de <strong>Geof\u00edsica<\/strong>! Espera a\u00ed\u2026 Geoqu\u00ea?<\/p>\n<p style=\"font-family: Comfortaa, serif;\">Vamos l\u00e1: j\u00e1 se perguntou por que os terremotos acontecem? Ou como exatamente as b\u00fassolas funcionam? Afinal, que for\u00e7a misteriosa \u00e9 essa que faz com que sua agulha aponte sempre para a mesma dire\u00e7\u00e3o? E de onde vem essa for\u00e7a? Bem, <strong>a explica\u00e7\u00e3o est\u00e1 sob os nossos p\u00e9s<\/strong>: tais fen\u00f4menos t\u00eam origem subterr\u00e2nea, e o trabalho da Geof\u00edsica \u00e9 estudar a <span style=\"text-decoration: underline;\">estrutura<\/span>, <span style=\"text-decoration: underline;\">composi\u00e7\u00e3o<\/span> e os <span style=\"text-decoration: underline;\">processos f\u00edsicos<\/span> que acontecem no nosso planeta, mais especificamente, no seu interior.<\/p>\n<p style=\"font-family: Comfortaa, serif;\">N\u00e3o se preocupe, a <strong>Prof\u00aa. Dr\u00aa. Andrea Teixeira Ustra<\/strong>, geof\u00edsica do IAG\/USP, se encarrega de esclarecer tais e outras quest\u00f5es que envolvem essa fascinante \u00e1rea do conhecimento no v\u00eddeo que fortemente sugerimos que assistam:<\/p>\n<p><iframe loading=\"lazy\" title=\"Olhando para dentro da Terra por Andrea Ustra\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/KLWSjg7XCz4?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p style=\"font-family: Comfortaa, serif;\">Viu como a Geof\u00edsica possui diversas aplica\u00e7\u00f5es que nos ajudam a compreender e resolver in\u00fameras quest\u00f5es cotidianas? \u00c9 claro que para tantas quest\u00f5es assim s\u00e3o necess\u00e1rias diferentes \u00e1reas que lidam com diferentes problemas. N\u00f3s vamos por enquanto explorar duas dessas \u00e1reas no decorrer das aulas: a <strong>Sismologia<\/strong> e a <strong>Magnetometria<\/strong>. Vamos l\u00e1?<\/p>\n<p style=\"font-family: Comfortaa, serif;\">Lembra da b\u00fassola? Seria poss\u00edvel reproduzir seu funcionamento com materiais relativamente simples que podemos encontrar em casa? Isso voc\u00ea ter\u00e1 que testar! Ent\u00e3o\u2026 <strong>m\u00e3o na massa!<\/strong><\/p>\n<p style=\"font-family: Comfortaa, serif;\">Siga o passo-a-passo abaixo para um experimento bem sucedido:<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"panel-746-0-1-2\" class=\"so-panel widget widget_sow-editor\" data-index=\"2\" data-style=\"{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;}\">\n<div class=\"so-widget-sow-editor so-widget-sow-editor-base\">\n<div class=\"siteorigin-widget-tinymce textwidget\">\n<p style=\"font-family: Comfortaa, serif;\"><a href=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-1056\" src=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/1.png\" alt=\"\" width=\"100\" height=\"100\" srcset=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/1.png 100w, https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/1-45x45.png 45w\" sizes=\"auto, (max-width: 100px) 100vw, 100px\" \/><\/a>Primeiramente encha uma vasilha ou pote com \u00e1gua (n\u00e3o precisa ser at\u00e9 a borda) e coloque em um ambiente fechado para que a circula\u00e7\u00e3o de ar ao redor n\u00e3o interfira no movimento da agulha. Aten\u00e7\u00e3o ao detalhe: o recipiente n\u00e3o pode ser met\u00e1lico, de prefer\u00eancia use acr\u00edlico ou pl\u00e1stico. Espere at\u00e9 a \u00e1gua ficar totalmente parada.<\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"panel-746-0-1-3\" class=\"so-panel widget widget_sow-editor\" data-index=\"3\" data-style=\"{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;}\">\n<div class=\"so-widget-sow-editor so-widget-sow-editor-base\">\n<div class=\"siteorigin-widget-tinymce textwidget\">\n<p style=\"font-family: Comfortaa, serif;\"><a href=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-1057\" src=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/2.png\" alt=\"\" width=\"100\" height=\"100\" srcset=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/2.png 100w, https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/2-45x45.png 45w\" sizes=\"auto, (max-width: 100px) 100vw, 100px\" \/><\/a>Delicadamente, coloque a agulha na \u00e1gua. A agulha tem que boiar na superf\u00edcie da \u00e1gua. Tire uma foto, fa\u00e7a um desenho ou v\u00eddeo. Encontre uma forma de registrar a dire\u00e7\u00e3o que a agulha fica quando se estabiliza na \u00e1gua.<\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"panel-746-0-1-4\" class=\"so-panel widget widget_sow-editor\" data-index=\"4\" data-style=\"{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;}\">\n<div class=\"so-widget-sow-editor so-widget-sow-editor-base\">\n<div class=\"siteorigin-widget-tinymce textwidget\">\n<p style=\"font-family: Comfortaa, serif;\"><a href=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-1058\" src=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/3.png\" alt=\"\" width=\"100\" height=\"100\" srcset=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/3.png 100w, https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/3-45x45.png 45w\" sizes=\"auto, (max-width: 100px) 100vw, 100px\" \/><\/a>Para ver como a agulha responde a um campo magn\u00e9tico, aproxime o im\u00e3 da agulha <strong>pelo lado de fora<\/strong> do pote com \u00e1gua.<\/p>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" title=\"Construindo uma B\u00fassola - Parte 1\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/aZrzdSHBwVs?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<div id=\"panel-746-0-1-5\" class=\"so-panel widget widget_sow-editor\" data-index=\"5\" data-style=\"{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;}\">\n<div class=\"so-widget-sow-editor so-widget-sow-editor-base\">\n<div class=\"siteorigin-widget-tinymce textwidget\">\n<p style=\"font-family: Comfortaa, serif;\"><a href=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/4.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-1059\" src=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/4.png\" alt=\"\" width=\"100\" height=\"100\" srcset=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/4.png 100w, https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/4-45x45.png 45w\" sizes=\"auto, (max-width: 100px) 100vw, 100px\" \/><\/a><\/p>\n<p style=\"font-family: Comfortaa, serif;\">Retire a agulha do pote e espere que a \u00e1gua fique parada novamente.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"panel-746-0-1-6\" class=\"so-panel widget widget_sow-editor\" data-index=\"6\" data-style=\"{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;}\">\n<div class=\"so-widget-sow-editor so-widget-sow-editor-base\">\n<div class=\"siteorigin-widget-tinymce textwidget\">\n<p style=\"font-family: Comfortaa, serif;\"><span style=\"text-decoration: underline;\"><a href=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/5.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-1060\" src=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/5.png\" alt=\"\" width=\"100\" height=\"100\" srcset=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/5.png 100w, https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/5-45x45.png 45w\" sizes=\"auto, (max-width: 100px) 100vw, 100px\" \/><\/a><\/span><\/p>\n<p style=\"font-family: Comfortaa, serif;\"><span style=\"text-decoration: underline;\">Imantando a agulha:<\/span><\/p>\n<p style=\"font-family: Comfortaa, serif;\">Com a agulha seca, passe-a sobre o \u00edm\u00e3 diversas vezes, <strong>sempre no mesmo sentido<\/strong>.<\/p>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" title=\"Construindo uma B\u00fassola - Parte 2\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/1JF_bH1vlC0?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<p style=\"font-family: Comfortaa, serif;\">Nesse processo, todas as part\u00edculas met\u00e1licas que comp\u00f5em a agulha ficam alinhadas com o im\u00e3, ou seja, formam um p\u00f3lo norte e um p\u00f3lo sul magn\u00e9tico!<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"panel-746-0-1-7\" class=\"so-panel widget widget_sow-editor\" data-index=\"7\" data-style=\"{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;}\">\n<div class=\"so-widget-sow-editor so-widget-sow-editor-base\">\n<div class=\"siteorigin-widget-tinymce textwidget\">\n<p style=\"font-family: Comfortaa, serif;\"><a href=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/6.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-1061\" src=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/6.png\" alt=\"\" width=\"100\" height=\"100\" srcset=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/6.png 100w, https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/6-45x45.png 45w\" sizes=\"auto, (max-width: 100px) 100vw, 100px\" \/><\/a>Mais uma vez, delicadamente coloque a agulha para boiar na \u00e1gua parada do recipiente e espere ela parar de mexer. Quando ela estiver bem parada, tire uma foto, fa\u00e7a um desenho ou v\u00eddeo. Se preferir, utilize uma folha de papel com um desenho ilustrando o mesmo sentido da agulha parada.<\/p>\n<p><iframe loading=\"lazy\" title=\"Construindo uma B\u00fassola - Parte 3\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/zv3fiEB7cLk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p style=\"font-family: Comfortaa, serif;\">A dire\u00e7\u00e3o final da agulha mudou? A linha da \u00e1gua \u00e9 o eixo Norte-Sul do campo magn\u00e9tico terrestre! Sua b\u00fassola est\u00e1 pronta!<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"panel-746-0-1-8\" class=\"so-panel widget widget_sow-editor\" data-index=\"8\" data-style=\"{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;}\">\n<div class=\"so-widget-sow-editor so-widget-sow-editor-base\">\n<div class=\"siteorigin-widget-tinymce textwidget\">\n<p style=\"font-family: Comfortaa, serif;\">Encontre uma forma de testar o resultado. Coloque ao lado uma b\u00fassola magn\u00e9tica ou se n\u00e3o tiver, utilize o sensor de um smartphone dispon\u00edvel, mas aten\u00e7\u00e3o: os sensores dos smartphones nem sempre apontam para a dire\u00e7\u00e3o precisa devido \u00e0 qualidade ou estado de calibra\u00e7\u00e3o do sensor. Para calibrar antes de utiliz\u00e1-la, mova o celular como mostra o GIF abaixo:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1063 size-full\" src=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2020\/09\/calibracion-brujula-movil-2a-349x260-1.gif\" alt=\"\" width=\"349\" height=\"260\" \/><\/p>\n<p style=\"font-family: Comfortaa, serif;\">E a\u00ed? A dire\u00e7\u00e3o da agulha corresponde a da b\u00fassola magn\u00e9tica real\/do celular? Caso n\u00e3o tenha como comparar dessa forma, fa\u00e7a testes para verificar se ela retorna para a mesma posi\u00e7\u00e3o que voc\u00ea marcou.<\/p>\n<p style=\"font-family: Comfortaa, serif;\"><strong>Agora discuta com seus colegas a respeito do experimento e com base no que aprendeu, tente buscar explica\u00e7\u00f5es para o que aconteceu!<\/strong><\/p>\n<p style=\"font-family: Comfortaa, serif;\">Por hoje \u00e9 s\u00f3, amanh\u00e3 voc\u00eas conhecer\u00e3o a outra parte da Geof\u00edsica que a Prof\u00aa Andrea falou pra voc\u00eas. At\u00e9 mais!<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"panel-746-0-1-9\" class=\"so-panel widget widget_sow-editor panel-last-child\" data-index=\"9\" data-style=\"{&quot;background_image_attachment&quot;:false,&quot;background_display&quot;:&quot;tile&quot;}\">\n<div class=\"so-widget-sow-editor so-widget-sow-editor-base\">\n<div class=\"siteorigin-widget-tinymce textwidget\">\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1257\" src=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2021\/07\/4-300x138.png\" alt=\"\" width=\"500\" height=\"230\" srcset=\"https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2021\/07\/4-300x138.png 300w, https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2021\/07\/4-768x353.png 768w, https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2021\/07\/4-400x184.png 400w, https:\/\/sites.usp.br\/projetocecilia\/wp-content\/uploads\/sites\/721\/2021\/07\/4.png 1024w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"pgc-746-0-2\" class=\"panel-grid-cell panel-grid-cell-empty\" data-weight=\"0.08\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Hoje \u00e9 dia de Geof\u00edsica! Espera a\u00ed\u2026 Geoqu\u00ea? Vamos l\u00e1: j\u00e1 se perguntou por que os terremotos acontecem? Ou como exatamente as b\u00fassolas funcionam? Afinal, que for\u00e7a misteriosa \u00e9 essa que faz com que sua agulha aponte sempre para a mesma dire\u00e7\u00e3o? E de onde vem essa for\u00e7a? Bem, a explica\u00e7\u00e3o est\u00e1 sob os nossos<a href=\"https:\/\/sites.usp.br\/projetocecilia\/s1-04\/\">[&#8230;]<\/a><\/p>\n","protected":false},"author":21824,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template-fullwidth-no-title.php","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"class_list":["post-746","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/sites.usp.br\/projetocecilia\/wp-json\/wp\/v2\/pages\/746","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sites.usp.br\/projetocecilia\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sites.usp.br\/projetocecilia\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sites.usp.br\/projetocecilia\/wp-json\/wp\/v2\/users\/21824"}],"replies":[{"embeddable":true,"href":"https:\/\/sites.usp.br\/projetocecilia\/wp-json\/wp\/v2\/comments?post=746"}],"version-history":[{"count":4,"href":"https:\/\/sites.usp.br\/projetocecilia\/wp-json\/wp\/v2\/pages\/746\/revisions"}],"predecessor-version":[{"id":1081,"href":"https:\/\/sites.usp.br\/projetocecilia\/wp-json\/wp\/v2\/pages\/746\/revisions\/1081"}],"wp:attachment":[{"href":"https:\/\/sites.usp.br\/projetocecilia\/wp-json\/wp\/v2\/media?parent=746"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}