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05-07-2014
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13 Likes

  1. btr
    btr liked post by Physicist On thread : "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!
    Welcome to the forum. Unless there are forces at work momentum is constant. However since he's talking about momentum being sustained it means that there are no forces at work here. Since there...
    Liked On: 10-10-2014, 01:40 PM
  2. btr
    btr liked post by Janus On thread : "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!
    Okay, let's pick up where we left off. Instead of a fixed distance, we'll assume a fixed time. To maintain momentum in our example for a given time, we need to work out what distance is...
    Liked On: 10-10-2014, 01:39 PM
  3. btr
    btr liked post by Janus On thread : "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!
    Your proof doesn't address the question asked. The question dealt with comparing the energy needed to "maintain" momentum, vs. that to regain lost momentum. So the first question becomes: ...
    Liked On: 10-10-2014, 01:39 PM
  4. btr
    btr liked post by Markus Hanke On thread : Editing posts
    The notice about a post having been edited appears after 5 min. The function to limit the ability to edit a post is currently disabled, so there is no time limit after which a post can't be edited.
    Liked On: 07-09-2014, 07:25 PM
  5. btr
    btr liked post by Jilan On thread : Definitions of volt using SI's fundamental magnitude
    Sorry if this if off-thread julian403, but the units we use are fascinating. I always meant to put these down in one place in a manner that each is derived from the previous ones. Some of you will...
    Liked On: 07-05-2014, 11:22 AM
  6. btr
    btr liked post by tk421 On thread : Definitions of volt using SI's fundamental magnitude
    The energy of a photon is related to frequency through Planck's constant: E = hf Next, you find something that evinces a similarly solid relationship between frequency and voltage. A Josephson...
    Liked On: 07-04-2014, 08:20 AM
  7. btr
    btr liked post by tk421 On thread : Maxwell's Equations, AC
    To btr's excellent answer I would only add that the solution assumes a return current "at infinity" (the usual wording in textbooks). If that boundary condition bothers you, just imagine that the...
    Liked On: 07-01-2014, 10:43 PM
  8. btr
    btr liked post by Jilan On thread : Einstein's equation E=mc˛ Question? Possibly challenge.
    I think that this argument has descended into an argument over semantics. Not particularly interesting, yawn!
    Liked On: 07-01-2014, 06:47 PM
  9. btr
    btr liked post by SpeedFreek On thread : The God's eye global gist of general relativity
    Well, it was remiss of YOU not to track the conversation back to where it started. Post 83 is quoting only part of post 78, whilst post 78 itself quotes the original statement made by Jilan in post...
    Liked On: 06-30-2014, 11:11 PM
  10. btr
    btr liked post by Jilan On thread : The God's eye global gist of general relativity
    x0x, I can see what happened now, you jumped in a post #60 Then you ignore the thread again until post #83 without catching up on the discussion in the meantime. Don't you think it would be a little...
    Liked On: 06-30-2014, 06:35 PM
  11. btr
    btr liked post by Beer w/Straw On thread : Einstein's equation E=mc˛ Question? Possibly challenge.
    Please don't be so hasty (I feel you were,) but try to make this forum a better place. (Yes, I've had too many beers already, but maybe I made a good request anyway.)
    Liked On: 06-30-2014, 05:22 PM
  12. btr
    btr liked post by Markus Hanke On thread : Gravity resulting from lensing
    Scalar theories of gravity fail fundamentally because they cannot capture all the required degrees of freedom. It is possible to describe the isolated phenomenon of gravitational light deflection...
    Liked On: 06-20-2014, 12:02 PM
  13. btr
    btr liked post by Markus Hanke On thread : The Varying Speed of Light
    Everyone, please remember that "speed" is a concept that is not as straightforward as it would initially seem, because we need to distinguish between coordinate speed and proper speed. In curved...
    Liked On: 05-31-2014, 06:49 PM