Comments by "ricomajestic" (@ricomajestic) on "Veritasium" channel.

  1. Steven Wang No. That's wrong. In the stationary cat's frame of reference the protons are not moving!
    79
  2. Steven, it depends on the frame of reference. From a stationary cat frame of reference (i.e.- a cat that is not moving relative to the wire), the protons are not moving but the electrons are moving to the right. However, from the electron's frame of reference the protons (and cat) are moving to the left.
    22
  3.  @xhawkenx633  Math is just a tool used to organize our observations and to see the patterns in nature.Math without the science tells you nothing about nature!
    4
  4.  @xhawkenx633  The wrong part is you claiming that we can understand nature through math alone. Imagine making absolutely no observations of nature or doing any experiments. Do you really think you'll be able to make any conclusions about how the universe works?
    3
  5. sidewaysfcs0718 Yes. The space  between th electrons is length contracted in the stationary cat frame. The wire is neutral AFTER taking length contraction into effect!
    3
  6.  @xhawkenx633  wrong even the Greeks knew it and we had to wait 2000 years for Galileo to come along before we could understand nature better through rigorous observation and experiment. Actually, math is a man made tool that comes from observation. The ancient greeks develop their mathematics (geometry primariily) by observing the heavens and things in nature.
    2
  7. Volbla The electrons are already contracted in the frame where the  cat is stationary! They are contracted in such a way that the charge density due to the protons and the charge density to the electrons is the same. That is why the wire is neutral and there is no electrostatic force between the charged cat and the neutral wire. In the moving cat frame, the electrons are at rest and that is why their separation increases. In this frame, the protons are the ones that are moving and so their seperation decreases hence the positive charge density in the wire is greater than the negative charge density in the moving cat frame.
    2
  8. Axel Ntwari Actually there's more to it. Experiments have been done that show that the stabilityof a bike is not due (at least not entirely) to angular momentum. The primary cause of the stability is a feedback mechanism from the rider when steering the bike. A bike without someone on it doesn't travel very far before it falls. Try locking the steering wheel so it cannot move at all and then push the bike. See if it is stable in that case!
    1
  9. Your professors were definitely at fault. They should've at least mentioned or dedicated a lecture or refer you to the literature on all the different interpretations of QM. It happened to me too as an undergraduate where only the Copenhagen interpretation was taught.
    1
  10. ***** " It's only our knowledge of the particle that changed, not the particle." That's only one interpretation and not even the most popular one. Your description assumes that the particle has a definite position and momentum at all times which is wrong.
    1
  11. So if the measurement alters the behavior of the pilot wave you are saying that it shouldn't alter the behavior of the particle?
    1
  12. ***** The electrons are already contracted in the frame where the  cat is stationary! They are contracted in such a way that the charge density due to the protons and the charge density due to the electrons is the same. That is why the wire is neutral and there is no electrostatic force between the charged cat and the neutral wire. In the moving cat frame, the electrons are at rest and that is why their separation increases. In this frame, the protons are the ones that are moving and so their separation decreases hence the positive charge density in the wire is greater than the negative charge density in the moving cat frame.
    1
  13. ***** There is a always a force on the cat and it always points in the same direction.From the frame of reference where the cat is stationary (i.e- relative to the cat and electrons), the force is an electric force due to length contraction between protons. From the frame of reference in which the cat is moving (i.e-relative to the protons), it is a magnetic force. In both frames of reference, the force on the cat is away from the wire-a repelling force. "Assume no current flow and stationary cat" -That would be a completely different problem not the one given here. You can only change the frame of reference. In this problem, if we were to some how stop the flow of charge there would a higher electron density in the wire and the positively charged cat would be attracted to it!
    1
  14. My bad. You are right the animation is not clear in the video. I believe your question had already been answered in some of the other comments from other people.
    1
  15. ***** Volbla is right! He explained it well too!
    1
  16. LuizBHMG 
    1
  17. Brandon Spicer "Or are we just assuming the wire is neutral after taking length contraction into effect, meaning the wire would be positively charged with no current"- YES!
    1
  18. It is like balancing a pencil on its point...unstable but in theory it can be done.
    1
  19. Not in an inertial frame of reference
    1
  20. Well the people that design IC's have to think about them as well as scientists since the physical world is entirely analog.
    1