Comments by "" (@mina86) on "Veritasium" channel.

  1. I LOVE how the people are genuinely interested.
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  2. Sorry, I somehow misread and thought you were asking about He. The way I understand BBT is that at the beginning forces themselves were all weird and bungled together, but as temperature and density decreased, the forces turned into the familiar four fundamental forces, at which point the universe consisted of elementary particles (quarks and leptons). As the temperature decreases further still, the quarks started binding together into hedrons (which include protons and neutrons).
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  3. “Inertia force”? Uh?
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  4. I don't think it bounces more easily. I think what's happening is that as the bullet hits the side, the block starts moving and “runs away” from the bullet thus the bullet does not go as deep into the block as when it hits the centre in which case the block is slower when “running away” from the bullet. The energy saved on not going as deep into the block is what spins the block.
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  5. This is yet another example why we should never let philosophers out of their caves. 7:45 – that’s called betting. Outcome with lower probability gets bigger payout. And whether you win or loose, the probability of the event remains the same.
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  6.  @natalyabaranova6827 , she is asked ‘what she believes the probability is’ therefore the course of action is to say whatever she believes and get a thousand dollars each time.
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  7.  @natalyabaranova6827 , this is philosophy in a nutshell. State a question with obvious answer and then wave arms around for long enough to confuse people to make them think you have something smart to say.
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  8. YT messed formatting. For full explanation with nicer formatting see pastebin com/8mCHVDp7 (you know where to put dot).
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  9. Gravity has nothing to do with the energy of rotation. Yes, the potential energy remains the same and the centre of mass moves in the same way in both experiments. However, in the second one, the block has more mechanical energy, as the kinetic energy of rotation is a real thing.
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  10. /watch?v=ph8xusY3GTM
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  11.  @TODLectures , no. Entanglement does not allow information to be transmitted.
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  12.  @VariantAEC , how do you know what is the transmission time? You’ve just described two-way measurement where one way is just photon in a vacuum and the other is electromagnetic force in a wire. That doesn’t solve the problem.
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  13.  @VariantAEC , how do you suggest to measure that speed? It’s the same problem all over again. And if you want to calculate it you will need to know speed of light. PS. You seem to be confusing speed of electrons in a wire (which is comparatively slow) with speed of signal propagation in a wire (which is quite a substantial fraction of the speed of light).
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  14.  @VariantAEC , we know the speed the same way we know the speed of light.
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  15.  @VariantAEC , different parts of a computer are akin to Earth and Mars in the analogy used in the video. Any speed measured is either two-way (where signal comes in, gets processed and then is measured at the end) or needs to rely on time synchronisation of different parts of a circuit.
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  16.  @VariantAEC , they rely on timing but not on one-way speed. But, well, I’ve tried. I don’t see how I can help you further. Maybe someone else will be able to better explain it to you.
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  17. Please include links to all mentioned links in comments as well. For one, on mobile one cannot click on the pop-ups on the video.
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  18. Damn, I was expecting a trailer for a full length Veritasium: The Science movie… That would be so cool. :)
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  19. Change playback speed to 1×.
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  20. To anyone thinking sound A is higher, make sure you have playback speed at 1×.
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  21. It's an inelastic collision meaning that the energy is not preserved (or more precisely kinetic energy is changed into heat) but the momentum is. So it's not that the one rotating has additional energy, it's the opposite, the one that is not rotating has less mechanic energy. If we take heat into account both blocks have the same energy, and the one that is not rotating has hotter.
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  22. Obviously, the rotation energy is taken from the bullet's energy and that's not a mystery. Point is, however, that there is no change in linear momentum.
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  23. With an impulse of force F lasting time t instead of a bullet then the rotating block will go lower because in the first case the force is only used for linear acceleration whereas in the second it's also used for rotation. That's different from the experiment on the video where an inelastic collision happens and some of the energy carried by the bullet is changed into heat. And they two are not “completely different”. They are separate experiments but with a very similar initial conditions.
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  24. Change playback speed to 1×.
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