O espa\u00e7o f\u00edsico, o comum, aquele onde vivemos, tem simetria de rota\u00e7\u00e3o de 4pi.
\n4pi?? Porqu\u00ea 4pi?? Ent\u00e3o uma rota\u00e7\u00e3o n\u00e3o s\u00e3o 2pi??<\/p>\n
Confesso que nunca percebi bem o que \u00e9 que isto queria dizer, at\u00e9 que apanhei com a pag 12 do livro:
\n Clifford Algebra – A Computational Tool for Physicists, de um tal JOHN SNYGG<\/p>\n
E ele explica:
\n“To illustrate this, you may wish to carry out a demonstration. First hold
\na glass of water in the palm of your hand. The hand holding the glass may
\nbe left or right but it is important that your hand be under the glass with
\npalm up. Then maintain a firm grip on the glass and rotate it 360\u00b0 without
\nmoving your feet or spilling any water. You may do this in either the
\nclockwise or counterclockwise direction. When you have completed this
\nmaneuver, you will find yourself in an awkward position with the glass
\nslightly above your head and your elbow pointed upward. Clearly the
\nrelationship of the glass to you is quite different from what it was in its initial
\nposition. However if you continue the rotation, you may be surprised to find
\nthat your arm will unwind itself and the glass will return to its initial position
\nwith its initial relationship to you.
\nThus the glass attached to your arm does not have a 2n periodicity but
\nit does have a 4n periodicity.
\n– –
\nExperimentei e fiquei esclarecido.
\nAli\u00e1s, at\u00e9 funciona melhor com uma ch\u00e1vena do com um copo.
\nCom uma ch\u00e1vena \u00e9 poss\u00edvel alinhar a pega com o indicador e apercebermo-nos melhor que de facto roda 360\u00ba+360\u00ba = 720\u00ba e n\u00e3o 360 para a frente e depois 360 para tr\u00e1s.<\/p>\n","protected":false},"excerpt":{"rendered":"
O espa\u00e7o f\u00edsico, o comum, aquele onde vivemos, tem simetria de rota\u00e7\u00e3o de 4pi. 4pi?? Porqu\u00ea 4pi?? Ent\u00e3o uma rota\u00e7\u00e3o n\u00e3o s\u00e3o 2pi?? Confesso que nunca percebi bem o que \u00e9 que isto queria dizer, at\u00e9 que apanhei com a pag 12 do livro: Clifford Algebra – A Computational Tool for Physicists, de um tal […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,7],"tags":[],"_links":{"self":[{"href":"http:\/\/www.inacreditavel.pt\/index.php?rest_route=\/wp\/v2\/posts\/17493"}],"collection":[{"href":"http:\/\/www.inacreditavel.pt\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.inacreditavel.pt\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.inacreditavel.pt\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"http:\/\/www.inacreditavel.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=17493"}],"version-history":[{"count":6,"href":"http:\/\/www.inacreditavel.pt\/index.php?rest_route=\/wp\/v2\/posts\/17493\/revisions"}],"predecessor-version":[{"id":17506,"href":"http:\/\/www.inacreditavel.pt\/index.php?rest_route=\/wp\/v2\/posts\/17493\/revisions\/17506"}],"wp:attachment":[{"href":"http:\/\/www.inacreditavel.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=17493"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.inacreditavel.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17493"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.inacreditavel.pt\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17493"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}