Recent content by .Scott

Welcome to these forums. Information and space-time have one well-explored connection. You may already be familiar with the Bekenstein Bound.

This is when the OP discovers what happens to puzzle threads after they are solved - they become a home to this sort of enlightened discourse.

I have crossed the dateline 6 times - three in each direction, so I am "evened out". On two of the return trips, the days progressed Friday, Saturday, Sunday, Saturday, Sunday, Monday. So I am two weekends up on life. Also, I once had three vernal equinoxes in a row before finally having...

I believe I have provided the answer that the Op was seeking. It was just a puzzle that was ineffectively presented.

Regarding the title you picked, I will quote a local philosopher: "Education is a progressive discovery of our own ignorance", Will Durant. I'm live in New Hampshire. So, in this case, local is about 125 miles.

Hello @red_ed : As you travel from Greenwich eastward around the globe, your time will jump in this sequence +1hr, +1hr, +1hr, +1hr, +1hr, +1hr, +1hr, +1hr, +1hr, +1hr, +1hr, -23hr, +1hr, +1hr, +1hr, +1hr, +1hr, +1hr, +1hr, +1hr, +1hr, +1hr, +1hr, +1hr. And you can work out the increments in a...

I suspect your problem is more of a wave guide problem than capacitance. With a 3cm wavelength, your "ground" level will criss-cross the surfaces of the box every which way. I would use dual-coax, ground the outer layer to the box and use the inner layer and the core for your resonator. Edit: I...

You are right. It is 12KV. In a classroom environment, I would still keep the voltage at or below 50V.

The area of you capacitor is about 0.53 square meters. The minimum non-zero distance is 0.1mm. That works out to about 4.7pF. So, with this device set at its minimal resolution, you would only need 12KVDC to store 350mJ.

Here are the "concepts of concern". A thin coating of water will not readily flow, so you are looking for either a very thin coat that will readily evaporate or "beading" to form clumps of water that will descend the slope. You're going to be dealing with surface tension and...

And you want to keep track of how many PF'ers are following your link? I am guessing you are referencing this article. It opened for me without any paywall interference.

Another strategy for dealing with leaks is to recover the leaking fluid and pump it back into the system. For your Helium system, I suggest these layers: the hot Helium core, regular piping, thermal insulating material, a vacuum, exterior piping and fixtures. I would have the recovery system...

For contrast, in the simplest kind of room thermometer: There is a small resistor in the thermostat that mimics the heating of the room. So, as the room changes temperature, so does the bimetalic strip in the thermostat. Without this resistor, the thermostat would bring the room to its proper...

Especially in contrast to Hydrogen, Helium is very inert - it is the most inert element. It's two electrons exactly fill the 1s2 shell. So, I would not expect it to have much of a chemical effect on anything. But that doesn't mean it is harmless. Most famously, Elon Musk has had conniptions...

I search on "helium permeation rates by temperature". It looks like about anything will allow Helium permeation and at 350C, and the Arrhenius-type response to rising temperature could be a major problem if your system needs to hold the gas for days at a time.