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User: Joffy

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Comments · 29

  1. Re:Are you serious? on Wilma the Capacitor and Particle Accelerator · · Score: 1

    How can you doubt him when his writing is so fluid!? ", this not usually discussed by medical science."

  2. Re:I41 on The Los Alamos Bug · · Score: 0

    I for one welcome our new Peptic overlords?

  3. Re:Grey... on The Los Alamos Bug · · Score: 1

    So are we all going to die from green goo, grey goo or gray goo?

  4. Rest Mass on PBS Features Einstein's Famous Equation · · Score: 4, Informative

    People should realize that the M in e=mc^2 is not the widely known idea of mass. Most people think that a bowling ball that weighs 10 pounds has a set mass no matter what. But in Einstein's equation mass is more like inertia. A moving bowling ball has more mass than one at rest. So you can not simply take a 10 kilogram object and multiply it by the speed of light squared to get its energy. This means you must first complete the equation for m first, which I do not know off hand.

    So the idea of mass that most people know is called rest mass. It took me a while to realize that they meant an object could increase mass but gain no atoms or extra "material". Since most objects we can see and touch don't even go 1% the speed of light, we never notice this increase. For almost all practical cases(even a plan going mach 3) we can consider its mass to be rest mass and still be accurate to within many many decimal places.