https://en.wikipedia.org/wiki/Orbital_mechanics

They can do that on earth.

We won't be growing or eating much rice in space.

More like something grown in a vat.

To be fair, it depends on the aerodynamics of the car. But let's say that somehow the aerodynamics are neutral, it just experiences drag, but the airflow does not result in a net uplift or push down the car. At a certain point approaching 70 mph the tires would start to lose traction and would not be able to provide enough friction to overcome air resistance. It might even happen well before that speed depending on the actual air drag. But it would never be able to achieve 75 mph.

But let's say that there is aerodynamics that push the car down as its relative speed increased. As it approaches the speed of the ring, about 70 mph, the driver would feel weightless, but because the car is aerodynamically coupled to the surface it could still go faster, and as it does the driver would start to feel the sensation of weight returning.

The car would loose control as it nears 70 mph and crash into something.

https://www.artificial-gravity.com/sw/SpinCalc/

At 1g:

Ring radius= 99.36 m

Tangential Velocity= 31.22 m/s

An average male runs at about 3.58 m/s so if they ran with the ring the 'downward' accelleration they would experience would be about 1.11 g. And if they ran in the opposite direction the acceleration would be .89 g.

LNG is not currently a viable green alternative just like Hydrogen isn't.

There is no limitation of either chemistry or physics that would prevent totally green LNG from becoming a thing, like there is for practical hydrogen stroage for transportation.

And many of the limitations you mention of ammonia can be overcome by adding a small percentage of hydrogen to the fuel mix. A much more ready to go alternative than hydrogen alone. And the hydrogen can be obtained by cracking the ammonia itself as needed as part of the engine system's operation, using waste heat.

https://newatlas.com/aircraft/aviation-h2-ammonia-fuel-jet-aircraft/

>which will eventually lead to a more efficient storage method to solve the "transportation" issue.

You will not 'eventaully' change the physics of hydrogen's energy density. Liquid ammonia has twice the energy density of 69MPa gaseous hydrogen. LNG/Liquid methane has four times the energy density. And commercial jets will not be using cryogenic hydrogen, not that this would solve the energy balance problem either.

Can you even load enough hydrogen onto a jet for this to be practical?

Why not methane, or ammonia?

https://h2sciencecoalition.com/blog/hydrogen-for-aircraft-number-crunching-the-solution-or-the-hoax/ >When you crunch the numbers it’s clear that hydrogen is not suitable for transportation. It requires too much energy to produce it without CO2 emissions (green hydrogen) and there is a significant storage problem, even for grey hydrogen. 

It's a very well known photo.

That's Mussolini & company,

I don't know where you are getting that idea. Particularly with distributed generation becoming more common.

They seem to have forgotten something.

You aren't wrong.

https://www.claimsjournal.com/news/national/2022/05/04/310253.htm >In France, where the government has temporarily required farmers to keep chickens indoors since November, some retailers are defying obligations to post clear information for consumers about the mandate, according to checks of grocery stores by Reuters.

Goodbye to that 'free range' market.

There are two kinds of concrete...

By that standard every single cold-war style nuke generation complex is a 'tech demonstrator' since they are all pretty much subsidized one-offs.

Perhaps you should pen a sternly worded letter to Putin then.

>Approved commercial reactors a company can buy,

There are several under construction in China and Russia. One operational in Russia for now. KAERI has one licensed in SK, and there are five more designs being evaluated for licensing in the US and Russia. And I am pretty sure we will see these designs in operation before this one in Poland can be brought online.

There are dozens of additional designs in the pipeline.

Current SMR designs are absolutely available at substation scales. The reason they can be used this way is that they are high temperature systems that can be placed anywhere.

The whole reason that cold-war era nuke plants had to be so big is that they were lower temperature designs with very particular requirements for cooling that restricts where they can be sited. So they have to be able to serve large regions.

"Mass production" of SMRs need not be the scale of consumer electronics to be cost effective. Unlike a cold-war scale design. which must be engineered on a bespoke basis, an approved SMR design can be replicated over and over. Which is absolutely a more cost-effective production model. Versus the comically and unpredictably expensive cold-war model..

Instead of placing the vertical framing members square on the frame just angle them to 22.5 degrees where they meet. Not 45 degrees. Then you only have to miter the top and bottom plates.

So does Australia's uranium for that matter.

Kazakhstan, Canada, Namibia...

> Likely they would need to be produced in the thousands to really drive the cost down by a significant amount,

This is exactly what will occur.

Again. SMRs do not use more resources.

The resources consumed do not only include materials used in the reactor, but also in the surrounding infrastructure.

>I mean they use more materials

Again, not hardly. You have to build a whole goddamned city to support an old cold-war scale nuclear plant. Cost overruns are one of the big reasons they are scarcely built anymore. They are resource intensive in many dimensions.

SMRs are not nearly as resource intensive because they can be used in tandem with existing infrastructure.

The only reason to dust off the cold-war model is for a jobs program... Kinda like NASA did with the SLS.

Not likely. Mass production tends to result in efficiencies that can't be achieved with bespoke engineering at any scale.

Not to mention, SMRs can be dropped in just about anywhere at the substation level, repurposing more of the existing infrastructure, while making it more resilient. Rather than having to build out extensive infrastructure just to accommodate the construction phase of this mega plant.