GreyEyedGhost

It requires more material and financial resources, but isn’t necessarily harder. Transmitting energy effectively to reduce heat, or managing the excess heat starts running into some pretty tough limits of physics. Most of the issues with spinning habitats are engineering problems within the capabilities of our current technology level and materials science. It’s just super expensive and has terrible ROI for now.

How is it a bad analogy? You seem to be treating it like a scale model, which i don’t think was the intention. Moreover, most of the effects map over fine.

There isn’t a requirement for a Dyson shell to transmit energy. You could just envelope the sun in habitats that use the energy they collect locally and that would meet the criteria of a Dyson shell (and a K2 civilization).

It needs to weigh enough that it counters the momentum/drag of the cable plus the net of whatever mass is going up. Keep in mind that cars going down add to that overall value while cars going up subtract. Also, the general opinion is for the station/anchor to be slightly above geosync so the net effect of the orbit on the station is to be pulling away from the earth (there is some wiggle room depending on how robust your earth anchor is and the mechanics of your tether with respect to tension vs. compression, but most models plan for a little net lift). In other words, you also attach to an anchor on the earth (which could just be a chunk of bedrock) to counteract that net force. Since the net force of the tether (not counting the earth tether) would be away from earth, any net loss of momentum would be regained from the earth’s spin (which happens whenever we launch a rocket right now). You could also have a spool at either end to maintain the desired tension on the tether while accounting for slight elevation changes due to net momentum loss or gain. On top of all that, the space anchor mass isn’t really dependent on the mass of the earth so much as it is on the net amount of mass being lifted or lowered to the earth and the amount of time you want to wait to return to it’s desired orbital altitude. And finally, if the tether was severed only the part whose center of gravity was below geostationary orbit would actually fall to earth - the rest would leave orbit.

This reminds me of a saying I heard. In America a hundred years is old. In Europe a hundred miles is far.

Given the quaint physics of circles, the expansion of a ring of silicate around the earth would be quite noticeable. C = 2×pi×r, which can be converted to r = C/(2×pi). Plugging in those two values gives us

40000/(2×pi) = 6366.1977 km

40008/(2×pi) = 6367.4710 km

So, taking this ring from 0° to 50° would cause it to rise 1.2 km into the air, assuming it kept its integrity.

A simpler way to write this is

(40008 - 40000)/(2×pi) or 4×pi.

A tiny difference, relatively speaking, but a quite notable difference given the context.

Moreover, the OP is a lemmy.ca account, and may very well be French Canadian. And guess what, the currency sign is trailing in French.

Wikipedia lists about 5 other uses, some of which would probably still be relevant today if we didn’t have cheaper ways to make perfume. Silly wise men, giving expensive, light, easily liquidated assets to people they believed were going to be fugitives. As well as some much heavier, but very easily liquidated assets. Poorest choices imaginable.

Myhrr was also used in incense, balms, etc. They were great gifts for anyone for the reasons you listed, especially during a time when people of that nationality had been ordered to travel possibly great distances and you believed the people you were giving the gifts to would be fugitives.

I doubt I’ll ever be bald, although I expect I’ll be pretty thin in my 70s and later, and I haven’t really cared one way or another about baldness. I got my first grey hair in my teens and it hasn’t stopped, and I don’t care too much about that, either (it was cool when I had the flashes of grey above my ears like Reed Richards in the old comics, which I thought looked so fake). My beard is shit, and I don’t care. I shave because it looks like shit, tho. It’s great if we can accept what we are.

I’m glad you’re happy with your skullet and epic beard.

Fun fact, copper, brass, and silver are anti-microbial, so a lot of old-time door handles were anti-microbial. Odd coincidence, isn’t it?

You just change the definition of your isolated system. It takes less energy to move heat from one place to another than it does to excite matter to release energy. For resistive or combustion heating, the isolated system is your house, plus the gas if using gas heat. For heat pumps, you include the rest of the world.

As an aside, heat pumps are generally considered good when they reach 300% efficiency, i.e., when every watt of energy expended adds 3 watts of heat to your home.

This is no longer correct. We have heat pumps that can be more than 100% efficient, even air-sourced heat pumps in -30° weather. There are still many places where this will still be more expensive than a gas furnace.

A single point of data rarely answers the question unless you’re looking for absolutes. “Will zipping 10 files individually be smaller than zipping them into a single file?” Sure, easy enough to do it once. Now, what kind of data are we talking about? How big, and how random, is the data in those files? Does it get better with more files, or is the a sweet spot where it’s better, but it’s worse if you use too few files, or too many? I don’t think you could test for those scenarios very quickly, and they all fall under the original question. OTOH, someone who has studied the subject could probably give you an answer easily enough in just a few minutes. Or he could have tried a web search and find the answer, which pretty much comes down to, “It depends which compression system you use.”