The true evil are the fuckers who post recipes in grams instead of cups and ml.
this post was submitted on 13 Aug 2024
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I hate it when they do it !
Don't ky/s over unit conversions OP. It's not that hard.
Same order of magnitude, don't bother with the trivial details.
Is it really tho? log(3.6) ≈ 0.55 so 1 km/h is really closer to 10m/s than 1m/s
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
I used to do it this way in highschool, but could never remember if it was divide by or multiply by 3.6
Instead I now do it as you have shown, except it all goes in the same expression.
10 km/h * 1000 m/km * 1h/3600s = 2.778 m/s
No need for the extra steps. Slap it all in the same expression and put it in the calculator (being careful to check that the units cancel as intended)
M/s is faster (lower number) than km/h so... That should give you enough explanation to understand whether you need to divide or multiply 3.6 when converting.
It just never stuck. Just for me personally it's easier to remember the base conversions of 1 km = 1000 m and 1 hr = 3600 and do the maths.
Just my own personal preference, and when dealing with more complex units, is the only way.
Shit like this is why we need metric time.
Shit like this is why metric needs to be replaced with a base12 system. Base10 is for children who still count on their fingers.
If at could start at blank slate then base 12 would make a better foundation, but base 10 is far too ingrained into every aspect of our life. It's much easier to convert time into base 10 than it would be to convert the world into base 12.
Dozenal for the win !!! It will never happen though, but dreaming is allowed
don't speak like the french
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.
I dislike that my highschool never once gave me the concept that units can simply be treated like constants to be cancelled out.
I used to do the conversions for each variable before putting them in the equation like a fool.
Now I'm slapping all of the conversions alongside the original values/units in a single expression like god intended.
I would like to introduce everyone to this video about cursed unit (youtube link warning)
kWh has an intuitive reason. Watts are so small that you'd always calculate consumption in MJ and whatnot, and seconds are so short that you'd always be expressing time in ks. Using kWh will reduce the numbers to useful ranges and makes cancelling M and k unnecessary.
I have a soft spot for units like watt hours and foot pounds. I find them very intuitive to explain.
Yeah, he elaborated it in his second video about the cursed unit that cursed ≠ useless.
Wait what, jow many kilominutes per hour is one mile per stone?
African or European swallow?
Unladen or not?
Just multiply by (1000m/1km)(1h/3600s) and cancel out the units, kids
In a parallel universe, someone is memeing about how teachers waste our time on useless stuff and never taught us to convert between units.
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