Brokkr

It belongs in a museum!

The video you linked summarizes the intent and benefit of Veritasium videos at about the 2:25 mark, stating that they are for a general audience. I agree that Veritasium isn’t perfect, and doesn’t provide complete depth, but they do a good job of creating interest in topics. So they accomplish their goal.

Additionally, the video you linked is wrong about the principles it discusses. The drift and diffusion velocity (group velocity) of electrons and holes is small compared to the speed of light. The relativistic effects discussed are caused by the phase velocity, which will be closer to the speed of light in the medium for even small currents.

Edit: originally, I incorrectly worded the last sentence which implied that the electrons and holes had a phase velocity equal to the speed of light. I hope the statement is more clear now, but I’m happy to provide additional clarification if necessary.

I think these are all excellent questions, but to my limited knowledge they haven’t been answered yet. I think these are all active areas of research in cosmology.

They are fun to wonder about though. If you have a deep interest maybe check out your library or bookstore. Once in a while scientists in these fields will write a book about their work in these areas.

Yes, that’s the one. Not exactly the same topic as the original question, but related.

It’s an interesting question, but a bit vague. Even at room temperature, relatively needs to be considered for the motion of electrons.

You’re probably thinking about bigger stuff though. The short answer is that temperature is unbounded so yes, there is a temp at which it is significant for the motion of all particles. I think inside of stars this can happen, but my knowledge jn that area is pretty limited.

Veritassium has a recent video about some of this that you may find interesting if you haven’t already seen it.

Thanks for the video. As it notes, the observations are real, but the explanation may not be known.

However, preventing the evaporation and then finding that the process does not occur kind of proves the evaporation theory, so I’m not sure that point works the way that you or Derek claim it does, unless I’m misunderstanding.

Lastly, I’m not claiming nor do I believe that there is some mystical way of violating the laws of thermo. I’m claiming that when the mass of water is reduced that the total latent heat is also reduced; that is completely consistent with thermo.

The reason the hot one freezes first is because the hot one evaporates more, thereby lowering it’s mass. The amount of energy that must be removed from water to cool it is small compared to the amount of energy to freeze the water. Therefore, the mass of the water that freezes determines the total energy much more strongly than the starting temperature.

Not by adding the hot water to the cold.

But if you can use the hot water to heat up the cold water a little bit, that can help. That would mean bringing them into thermal contact but not allowing them to mix.

Bonus question. What will freeze faster: a cup of 100 ml hot water or 100 ml cold water? Both are uncovered.

You can actually run your demonstration, literally in front of your own eyes, using a balloon and drawing some dots on it.

Anything with mass can’t travel at the speed of light, but a massless particle, such as a photon, completes its trip instantly from its perspective. A photon is created, departs, and arrives at its destination simultaneously.

I agree with nearly all of your points. The stopping problem is the same as the accelerating problem. Assuming near infinite energy reserves, but limited power generation, then the ship would accelerate for half the trip, turn around, and then decelerate for the 2nd half. Depending on the amount of power that can be generated, earth gravity may be possible during the trip (except for the turn around in the middle).

From some quick searches (so not a definitive answer, but a place to start), it seems that sound waves are most likely longitudinal which doesn’t cause shear. However, shear forces can be created by sound waves when they hit a surface.

From that information, I don’t think the shear energy imparted by a sound wave is very large. Since non-newtonian fluids only thicken under shear, they may not actually behave very differently than a regular fluid in these conditions. Preventing sound waves from traveling is usually accomplished by causing lots of scattering (open cell foam) or by absorbing the energy in a viscoelastic material (usually polymers).

It already has lost its meaning. Semites are anyone who speak or spoke a semetic language. Arabic and Hebrew are both semetic languages. Palestinians and Israelis are both semites.

I could have gotten it backwards. Depends on how the system is being defined and which direction the heat is going.

The energy to change phase, the latent heat of vaporization, does decreases. Enough such that the ambient temperature is able to supply sufficient heat for vaporization (that is, boiling). The latent heat of vaporization is temperature and pressure dependent for most materials.

I’m guessing it’s an aluminum oxide abrasive? The abrasive is flourescing due to the little bit of uv coming out of the LEDs.

You might find this interesting, if you are grinding iron or steel then the grinding surface may not flouresce due to the iron bonding with the aluminum oxide.

I’m a different person than you replied to. You are both correct.

When we, Americans, vote for president we vote for an individual by their name on the ballot. Technically, we’re voting for electors who have been chosen by our candidate. Those electors get to vote for the actual presidency and can technically change their vote (relative to the popular vote), but in many places they would be penalized for doing so. To my knowledge there have been few, possibly no, legal cases which have tested these laws or systems. So in practicality it doesn’t matter.

New comment based on your edits.

When we breath, we use the oxygen, but we do not use the nitrogen. The nitrogen can actually be replaced with another inert gas and the “air” is breathable. Thinking about diving specifically, nitrox is actually an oxygen rich (nitrogen poor) mixture. More extreme mixtures use helium in place of some nitrogen (and sometime oxygen depending on the depth).

In your body, the amount of oxygen in our blood is critical for survival. Having a lot of nitrogen is actually not good. Too much is what causes the “bends”, again related to diving.

When looking at exoplanet atmospheres, we look for oxygen rich because it likely indicates water. We believe that planets with a high amount of water are more likely to support life similar to ours. It is possible that another form of life exists that doesn’t need oxygen or water, but we know for certain that oxygen and water can support life.

You’re implying that the double slit experiment is unresolved. What do you mean by that?

Edit: I’d also be interested to read the articles about entropy and time. Could you link one please?

While it’s true that a photon doesn’t see time pass, an electron does and they exhibit the same behavior in the double slit experiment. I don’t see how the particles perception of time explains the results.