A more complicated, related example is how WW2 fighter aircraft machine guns were aimed.

There might be, for example, four guns on each wing. The aiming reticle is in the cockpit, between them. The whole shebang is adjusted so that the bullets from each side converge (for example) one hundred meters ahead of the plane, and the aiming reticle points at that spot. This adjustment has to account for the angles from left and right, as well as the bullet drop, and air drag at a particular airspeed.

Like with the rifle scope, the pilot's aiming reticle has extra marks on it to allow aiming at other distances, and especially for leading a moving target.

Me too. Boom needs to keep us posted on his Health Journey.

Or else I will have a Sad.

Radiant!

Pred. What would you say...you do here?

You about to find out what lèse majesté means.

And you should listen to her.

That is exactly how "space scales" work. Astronauts get wobbled back and forth by the scale, which compares the force to the movement, and computes the mass.

Hurricanes, for instance, are estimated (by U.S. NOAA) to release energy roughly equivalent to a 10 megaton nuke going off. EVERY 20 MINUTES. FOR DAYS AND DAYS.

There actually is a device that many people have used, which uses a perpetual motion machine as a very important part. Many MRI or NMR machines contain a powerful electromagnet built with superconducting wires. Once you get the current in the wires running, and the magnetic field built up, you disconnect the power source and the current keeps going, forever. (Or until you shut it down for maintenance, or there's a quench failure.)

https://radiopaedia.org/articles/magnets-types

Bombs dropped on Japan were in the 10-20 kiloton range. Very Big cold war era H-bombs were up.to about 20 megatons, so about 1000 X. Contemporary missile carried MIRV bombs run around 150 kilotons, about 10 X. Militarily speaking, more, smaller bombs are more useful.than a few big bombs.

In about 1975 I saw an estimate that about 400 medium size bombs would be required to completely destroy everything and everyone in the Soviet Union. (This estimate only considered "prompt" deaths and destruction. No consideration was given to long-term radioactive damage or starvation. Yes, it was a fun time to grow up, why do you ask?)

Audible sound runs from about 10 Hz to about 25,000 hz.

Visible light runs from 4 x 10 E 14 hz to 8 x 10 E 14 hz. ( 10 E 14 hz is 100 Terahertz )

Congratulations! You found a use for vocal Fry!

Ok ok you are right. For consistent syntax, gotta call it "foot"ball and "hand"egg.

The new rule is only 1) the four infielders must remain in the infield, so cannot move one outfield for coverage, and 2) there must be two infielders on either side of the home-second base diagonal.

In the us, at least, soccer is popular among some demographics also because, unlike basketball, where height is important, or handegg, where weight is important, soccer is pretty agnostic about body types. Makes for more enjoyable competitions.

You mean "American handegg" to differentiate it from "Commonwealth handegg" and "global kickball"

Ack. Dude.

Oogh. Sorry, no Malamute has that name.

And what's the dog's name?

Mainframe systems maintained tape record indices ( after reading them from tape) in RAM or "drum" disk for just this reason. Read Knuth on efficient tape database searches, if you have a kink for antique software engineering. But bear in mind I was working on IBM 360 and 370 mainframes, followed by Data General minicomputers in the 80s.

Disagree. The tapes I used, in the 70s and early 80s, 9 track 6250 BPI in NRZI, used 4K up to 32 K byte records with inter-record gaps. Controllers could count records on the fly without moving data to ram, until you got to the record you wanted.

A lot like sectoring on HDD.

/Pedant_Mode_Off

random access memory was first named that to distinguish it from serial access memory, more familiarly called magnetic tape.

Imagine a library of 1000 books. Ram is like having all the books sorted and ready to easily grab on a big bookcase. All books take about the same short time for you to grab.

Serial access is like all the books are laid out in a long line on a conveyor belt. To get a particular one, you have to stand and wait until the conveyor brings it to you.I

I'll let others explain the modern differences among RAM, ROM, and SSD, and HDD.

Older aircraft jet engines could be very smoky, especially at low altitudes. This was a problem for many reasons, e.g. military stealth is tough when the bad guy can see your smoke trail from 30 klicks. The one I'm familiar with is the CJ805 on the Convair 990 circa 1970, and you could see it on landing approach from 5 minutes away.

Recip engines of various sizes are limited also by the maximum acceleration of their parts. More precisely, by the maximum strain energy per unit volume in critical parts, like the rod bearings. McMahon's book On Size And Life has a very good description of this and an analysis of engines ranging from tiny model airplane motors running at 25000 rpm, to gigantic industrial motors run ing at a few tens of rpm.

Big? You mean vig?