Comments on: Why Does E=mc2? http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/ Random samplings from a universe of ideas. Mon, 09 Nov 2009 10:04:03 -0600 http://wordpress.org/?v=2.8.4 hourly 1 By: E=MC2: why? - Page 2 - Bad Astronomy and Universe Today Forum http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/comment-page-1/#comment-81537 E=MC2: why? - Page 2 - Bad Astronomy and Universe Today Forum Tue, 07 Jul 2009 15:06:59 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/#comment-81537 [...] Cosmic Variance comments on this question. [...] [...] Cosmic Variance comments on this question. [...]

]]> By: Mark http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/comment-page-1/#comment-25661 Mark Tue, 24 Apr 2007 16:51:33 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/#comment-25661 Hi jon. Light carries momentum, that it imparts to the box. A particle need not have mass to do this. In fact, if you think of light as a wave, it is pretty easy to think of the wave as carrying momentum as it travels along. Hi jon. Light carries momentum, that it imparts to the box. A particle need not have mass to do this. In fact, if you think of light as a wave, it is pretty easy to think of the wave as carrying momentum as it travels along.

]]> By: jon http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/comment-page-1/#comment-25650 jon Tue, 24 Apr 2007 14:13:37 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/#comment-25650 sorry if i sound stupid, but since the light carries no mass how does it induce a force on the box such that it moves? sorry if i sound stupid, but since the light carries no mass how does it induce a force on the box such that it moves?

]]> By: Janet Leslie Blumberg http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/comment-page-1/#comment-25649 Janet Leslie Blumberg Sun, 22 Apr 2007 05:41:00 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/#comment-25649 Hang on, I just clicked on your course materials. I'll study them and get back to you if I'm still at sea. Thanks! Hang on, I just clicked on your course materials. I’ll study them and get back to you if I’m still at sea. Thanks!

]]> By: Janet Leslie Blumberg http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/comment-page-1/#comment-25648 Janet Leslie Blumberg Sun, 22 Apr 2007 05:34:51 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/#comment-25648 Mark, I wish I could have had your course! As a humanities prof, I've worked with colleagues in physics to "finally come to understand it (relativity)" for about 15 years. They give me books and I read them. I follow the arguments. But "understand" it? Do you have other course materials on relativity to recommend? Or other people's stuff? I've read Einstein's own book on relativity, too. I get how different observers are measuring differently and all that. But I can't visualize or comprehend how "light" is radiating through space-time, while everyone is measuring it from their own referential viewpoints. Am I supposed to be able to? I guess I'm confessing I don't really understand how everything else obeys the addition of velocities relative to the observer except light. Do your undergrads really get there? I am fascinated by relativity and never stop wishing I could "get" it. Mark,
I wish I could have had your course! As a humanities prof, I’ve worked with colleagues in physics to “finally come to understand it (relativity)” for about 15 years. They give me books and I read them. I follow the arguments. But “understand” it? Do you have other course materials on relativity to recommend? Or other people’s stuff? I’ve read Einstein’s own book on relativity, too. I get how different observers are measuring differently and all that. But I can’t visualize or comprehend how “light” is radiating through space-time, while everyone is measuring it from their own referential viewpoints. Am I supposed to be able to? I guess I’m confessing I don’t really understand how everything else obeys the addition of velocities relative to the observer except light. Do your undergrads really get there? I am fascinated by relativity and never stop wishing I could “get” it.

]]> By: Talking Right Past Each Other - Deep Grace Is Needed « Deep Grace of Theory http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/comment-page-1/#comment-25642 Talking Right Past Each Other - Deep Grace Is Needed « Deep Grace of Theory Sun, 22 Apr 2007 05:17:23 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/#comment-25642 [...]                And I can do this – because I’ve worked all my life to figure out how to do it.  I can do this because my branches of philosophy are literary theory and epistemology (”the formal study of how humans come to know, and how they know that they know, when they think they do”).  And for a long, long time I have wanted to explain these things, just the same way I now see gifted physicists on their popular weblogs explaining the complexities of all the various branches and sub-branches of physics to the uninitiated and partially initiated.  (Check out Mark on “Why E=Mc^2″ at www.cosmicvariance.com) [...] [...]                And I can do this – because I’ve worked all my life to figure out how to do it.  I can do this because my branches of philosophy are literary theory and epistemology (”the formal study of how humans come to know, and how they know that they know, when they think they do”).  And for a long, long time I have wanted to explain these things, just the same way I now see gifted physicists on their popular weblogs explaining the complexities of all the various branches and sub-branches of physics to the uninitiated and partially initiated.  (Check out Mark on “Why E=Mc^2″ at http://www.cosmicvariance.com) [...]

]]> By: Qubit http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/comment-page-1/#comment-25641 Qubit Fri, 20 Apr 2007 18:54:46 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/#comment-25641 Oh Well! I Tried. Oh Well! I Tried.

]]> By: Mark http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/comment-page-1/#comment-25647 Mark Thu, 19 Apr 2007 21:24:30 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/#comment-25647 Ok Qubit - I've no idea what you're getting at, or where the quotes came from. Sorry. Ok Qubit – I’ve no idea what you’re getting at, or where the quotes came from. Sorry.

]]> By: Qubit http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/comment-page-1/#comment-25646 Qubit Thu, 19 Apr 2007 21:17:59 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/#comment-25646 Count Iblis and everyone maybe the demon can split its self into two. Have you read Rumpelstiltskin? The 1857 version. Mind you didn't that story come from one of the stories of Isis getting the magic name from Ra, in order to resurrect Osiris, these are all Quantum physics. Looks like there is some serious cheating going on in this universe! And am sure that story as changed a little since last time I read it. I've put my cards on the table (well on my blog), Mankind show me yours? :) Qubit Count Iblis and everyone maybe the demon can split its self into two. Have you read Rumpelstiltskin? The 1857 version. Mind you didn’t that story come from one of the stories of Isis getting the magic name from Ra, in order to resurrect Osiris, these are all Quantum physics. Looks like there is some serious cheating going on in this universe! And am sure that story as changed a little since last time I read it.

I’ve put my cards on the table (well on my blog), Mankind show me yours? :)

Qubit

]]> By: Qubit http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/comment-page-1/#comment-25615 Qubit Thu, 19 Apr 2007 20:19:08 +0000 http://blogs.discovermagazine.com/cosmicvariance/2007/02/23/why-does-emc2/#comment-25615 Mark Looking (so to speak) at a thought experiment is mostly done in what we regarded as the past, just like we have experienced it as a memory, but instead of experiencing it, we have created it in the way that we would have experienced it. If the future is undecided then all possible outcomes have to be taking into consideration, if you have the knowledge of it occurrence in advance, then that question can be answered, without experiencing it in the past. The 2nd law of thermodynamics can be over come by using tricks! But trick are exactly what they appear to be. "I never think of the future - it comes soon enough." You don't come up with that sentence and E=MC2 without telling everybody what really E=MC2 is, unless your lying. Einstein thought of the future more than most! "If A is a success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut." Who am I to tell you what Z is? Qubit Mark

Looking (so to speak) at a thought experiment is mostly done in what we regarded as the past, just like we have experienced it as a memory, but instead of experiencing it, we have created it in the way that we would have experienced it.

If the future is undecided then all possible outcomes have to be taking into consideration, if you have the knowledge of it occurrence in advance, then that question can be answered, without experiencing it in the past.

The 2nd law of thermodynamics can be over come by using tricks! But trick are exactly what they appear to be.

“I never think of the future – it comes soon enough.” You don’t come up with that sentence and E=MC2 without telling everybody what really E=MC2 is, unless your lying. Einstein thought of the future more than most!

“If A is a success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut.”

Who am I to tell you what Z is?

Qubit

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