In a parallel universe, someone is memeing about how teachers waste our time on useless stuff and never taught us to convert between units.
I’ll be pissed if the comments are about metric units
That’s interesting. Obviously, you’d put a center dot to disambiguate millihertz from meter-hertz, but I can’t recall ever having learned a rule about that. So some combinations of units are inherently ambiguous?
Also: Hz/dpt.
I can’t tell which unit is more cursed: millihertz or meter hertz. Surely, anything that could be measured in millihertz is more natural to measure as a period, or as revolutions per minute or something, right?
EDIT: Also, TIL about dpt. Thanks!
A dioptre (British spelling) or diopter (American spelling), symbol dpt, is a unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, 1 dpt = 1 m^−1.
Something that occurs once a hour has a frequency of 277.777… μHz
You know, I always figured optometry involved like, super complicated math and shit.
Turns out it’s just basic arithmetic.
Kinda like programming, in a way.
Speed as meter per hertz is a rather odd case, like with a machine that goes in discrete steps.
In any case, I never use implied multiplication (and others) and always simply put everything where it should be.
Speed is metre hertz rather than metre per hertz. Metres per hertz would measure absement, which is a measure of how far away something is from a start point and for how long. So being twice as far away for half the time would be the same amount of absement.
Thanks, I hate it
Saw a video using mHz recently and it took way too long to realise the readout was correct and not a typo of MHz …
Metre hertz? Lol
This is actually pretty important to being able to solve engineering problems in the real world. Invariably, every little sub industry has its own cursed unit system. And dimensional analysis is great for solving real problems on its own.
And if you get to a high enough physics level, they start setting hbar = c = 1 or G = c = 1, and you never have to worry about it again.
I’m the mean time, it’s worthwhile to learn the trick to do this stuff fast-ish.
Wait what, jow many kilominutes per hour is one mile per stone?
African or European swallow?
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Just multiply by (1000m/1km)(1h/3600s) and cancel out the units, kids
It isn’t even that much of a time waste you just multiply 1000/3600
But it would take me a couple of hours to figure that out.
Have you tried converting those hours to seconds?
That Hertz
Just divide by 3.6
Example:
10 km /h * 1000 m / km = 10,000 m /h
10,000 m/h * 1h/3600s = 10,000/ 3,6000 m/s = 10/3.6 m/s
Same order of magnitude, don’t bother with the trivial details.
