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Old 01-27-2025, 04:58 PM
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Nate the Great Nate the Great is offline
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So I'm watching a YouTube video involving physics and once again g is approximated as 10 m/s^2...


PNQ: Suppose the science community upon discovering g=9.8 m/s^2 wanted to recalibrate either m or s to make g=10 m/s^2, do you think it would've made more sense to alter m or s? That is, shorten the length of a meter or make a second a bit longer?



We're going to ignore the original origin of a meter as 1/10,000,000 of the distance from a pole to the equator. This presupposes that the circumference of the earth can be measured that precisely to begin with, which is absurd.



As for a second being 1/86,400 of a day, we have to specify which "day" we mean because there are several (sidereal and solar just to name two). Plus the Earth's rotation is slowing down making any such measurement arbitrary anyway.
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