[deleted]

I'm used to the heat being increased an hour or two before opening, and lowered significantly during the empty hours. But if there is no heating at all then they can't even get a little warm until you have a lot of human traffic.

In videos taken from the ISS you see some motion, but that's mainly the orbit of the ISS around Earth (which takes just ~1.5 hours, so it's much faster than Earth's rotation).

Also, metallurgy has improved greatly over the last 50 years or so. This allows engines to be built from better stuff, which can be machined to closer tolerances. Back in the 60s, you expected to do a top end rebuild inside of 100k miles. Now we frequently see engines go 250-300k or more without any major maintenance. Computer aided design allows better modeling of fluid flows. Lots of electronics inc cars these days, controlling every aspect of the vehicle. They will even tell you what's wrong with the car, something the 60s mechanic could only dream about.

[removed]

It could be done, however due to sheer numbers it would be a catastrophic strain on the environment. Can you imagine if 700+ million people just started cutting down trees in order to heat their home all winter? That coupled with the fact that most homes are not equipped with any heat source outside of the natural gas/electric furnace they were built with.

Improved living standards, too. What was normal 500 years ago won't be accepted today.

[deleted]

Laws and investments.

Medieval people survived the cold by making fire inside their homes, today you have to fulfill regulations to do that (I.E. you need a proper fireplace and chimney). Just adding those to an existing home can be expensive, and at least in my area they are pretty much sold out.

In medieval times population was much lower, so it was viable to just heat every home with wood. If you tried that now we'd run out of forests quickly, and dense cities would be dark in the smoke

They covered it in General Biology 1 at my college (the BIO101 course). The book even had cool pictures of the main protein involved in ATP synthesis, which spins around like a little motor or generator.

Check it out

High ceilings also help with noise control. And airport areas area usually fine with a 5 story high building and they don’t get much more expensive

Pretty sure that many hotel rooms work this way. If there isn't an A/C unit shoved through the wall then there's probably a chilled-water AHU in the ceiling above the door or bathroom.

[removed]

Lol Union Square subway station in no way feels like "a giant hall with a very tall roof"

...and computers. That fuel/air ratio does not mix itself!

Did the motion of the wall change? Yes it did.

[removed]

[removed]

Incremental improvements to every individual part of the engine, accelerated by computer assisted design and physics modeling.

The numbers you’re hearing are linear speed, not angular speed.

vᵣ=rω where v is the linear speed, r is the radius of rotation and ω is the angular speed.

For earth, r = 3950 mi, and ω = 15°/h. This gives vᵣ= 3950×15×π÷180=1034.107666 mi/h (π÷180 is just a unit conversion) at the equator. Sound familiar?

Now, what really matters is ω - that 15°/h. This is half the angular speed of the hour hand on a clock. The hour hand on a clock goes around twice in a day, which works out to 30°/h. That’s not a movement we can easily perceive when viewed from altitudes like the one the Blue Marble photo was taken at, the perspective we have of the earth is very similar to the perspective we have of a clock. The angular speed is just slow enough we can’t perceive it.

Edit: unit errors in my math

Short answer: Better combustion efficiency, airflow, fuel control and lots more RPM.

HP = (Torque(lb/ft) * RPM)/5280

The original horse power was one horse lifting 1 pound 1 mile (5280 feet) in one minute

So a motorcycle example, BMW R1000rr ~1 liter displacement 205hp @ 13,000 rpm is over 200hp / liter naturally aspirated. The bike still makes ~83 lb/ft of torque at 13,000 rpm. Enough fuel and air into the engine though the injectors. Then the correct compression, ignition and power stroke. Then the whole motor is designed to be optimal for this power.

Nothing off of a race track was spinning 13,000 RPM in the 1970's..

Have you ever seen that dress that some people see it white and gold and others blue and black? If not, just google (the dress colors) you will find it, it is actually crazy how my brother see it blue and black and I see it white and gold I just can't understand how.

"For every action, there's an equal and opposite reaction"

Basically, what it's saying is forces always comes in pairs. For every force, there's an equal force in the opposite direction.

The force pushing air out of a balloon has an equal and opposite force that pushes the balloon forward.

The force from a boat's propeller pushing water backwards has an equal and opposite force that pushes the boat forwards.

The force that shoots a bullet out of a gun has an equal and opposite force that causes the gun to recoil.

I'm pretty sure most places turn off (down) the heat when they're closed so its probably about the same effect.

I used to live there, and it gets even colder than that. If I had to guess I would say residual heat? Possibly something engineered with the hot water being next to the cold water pipes? I really have no idea but it was a comfortable temperature every time I went during winter.