{"id":646,"date":"2008-08-11T13:02:08","date_gmt":"2008-08-11T18:02:08","guid":{"rendered":"http:\/\/blogs.scienceforums.net\/swansont\/?p=646"},"modified":"2008-08-11T13:02:08","modified_gmt":"2008-08-11T18:02:08","slug":"chuckles-from-above","status":"publish","type":"post","link":"http:\/\/blogs.scienceforums.net\/swansont\/archives\/646","title":{"rendered":"Chuckles From Above"},"content":{"rendered":"<p>Catching up with my blog reading.  Via <a href=\"http:\/\/physicsandphysicists.blogspot.com\/2008\/08\/einstein-formula-e0mc2-isnt-lord.html\">Physics and Physicists<\/a>, an ArXiv paper by L. B. Okun, <a href=\"http:\/\/arxiv.org\/abs\/0808.0437\">The Einstein Formula: E<sub>0<\/sub>=mc^2 &#8220;Isn&#8217;t the Lord Laughing?&#8221;<\/a> detailing some history of &#8220;relativistic mass&#8221; and the confusion surrounding the term.<\/p>\n<blockquote><p>The article traces the way Einstein formulated the relation between energy and mass in his work from 1905 to 1955. Einstein emphasized quite often that the mass m of a body is equivalent to its rest energy E<sub>0<\/sub>. At the same time he frequently resorted to the less clear-cut statement of equivalence of energy and mass. As a result, Einstein\u2019s formula E<sub>0<\/sub> = mc<sup>2<\/sup> still remains much less known than its popular form, E = mc<sup>2<\/sup>, in which E is the total energy equal to the sum of the rest energy and the kinetic energy of a freely moving body. One of the consequences of this is the widespread fallacy that the mass of a body increases when its velocity increases and even that this is an experimental fact.<\/p>\n<p>[&#8230;]<\/p>\n<p>Why is it that the weed of velocity-dependent mass is so resistant? First and foremost, because it does not lead to immediate mistakes as far as arithmetic or algebra are concerned. One can introduce additional \u2018quasi-physical variables\u2019 into any selfconsistent theory by multiplying true physical quantities by arbitrary powers of the speed of light. The most striking example of such a \u2018quasi-quantity\u2019 is the so-called \u2018relativistic mass.\u2019 If calculations are done carefully enough, their results should be the same as in the original theory. In a higher sense, however, after the introduction of such \u2018quasi-quantities,\u2019 the theory is mutilated because its symmetry properties are violated. (For example, the relativistic mass is only one component of a 4-vector, while the other three components are not even mentioned.)<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Catching up with my blog reading. Via Physics and Physicists, an ArXiv paper by L. B. Okun, The Einstein Formula: E0=mc^2 &#8220;Isn&#8217;t the Lord Laughing?&#8221; detailing some history of &#8220;relativistic mass&#8221; and the confusion surrounding the term. The article traces &hellip; <a href=\"http:\/\/blogs.scienceforums.net\/swansont\/archives\/646\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39],"tags":[],"class_list":["post-646","post","type-post","status-publish","format-standard","hentry","category-physics"],"_links":{"self":[{"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/posts\/646","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/comments?post=646"}],"version-history":[{"count":0,"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/posts\/646\/revisions"}],"wp:attachment":[{"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/media?parent=646"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/categories?post=646"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blogs.scienceforums.net\/swansont\/wp-json\/wp\/v2\/tags?post=646"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}