Recent content by larsa

I have read that at a balanced three phase AC system reactive power is not tranferred between source and load but instead it is exchanged between system phases. Is this true? I can't find any book or paper that corroborate this

What is the intuition behind the fact that stokes flow is time reversible?

There is a cause and effect situation in our case, which I am looking forward to learn. Physics is fruitful, agnosticism is boring.

Yes, exactly this is what i am asking

What do you mean?

What is so special about the second derivative? If it was the first derivative it wouldn't be time invariant?

Is there any deep reason behind this? per example the principle of least action or something else?

It was simpler than I thought, thank you for your help

Why a fluid jet becomes unstable only when the wavelength of the perturbation exceeds the value of jet perimeter? Do you imagine any physical reason behing this?

This is something I do not know how to explain. Although velocity decreases due to friction with ambient air, momentum should be conserved and, therefore, it entrains mass. What is the reason that momentum should be conserved?

Thank you very much

Is there any entropic gain when the surface of a liquid is minimised? Per example, molecules "enjoy" maximum entropy when they are at the interior. Is this valid?

There must be some relation but i can't imagine any. Thank you for your answer

How can I derive that the work of a force perpendicular to velocity is always zero from the theorem of Noether? I have heard that there is a relation between these two but in Google I found nothing. Thank you very much