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Ask them if they knew that g is roughly pi^2, and ask them if they knew it's not a coincidence
How would it not be a coincidence?
okay, so.
the meter used to be how long a line had to be on a pendulum for it to have a periodicity of one second. This got re-evaluated and standardized to what it is now, which is 1/10,000,000 the length between the equator and the north pole. but that number itself was chosen because it's pretty close to what the meter was before it was set to that value. So the length of the line to get that period on a pendulum is about a meter, and gravity also has an effect on the speed a pendulum swings.
https://medium.com/@roitman.io/a-wonderful-coincidence-or-an-expected-connection-why-%CF%80%C2%B2-g-6e2f9a04e30e
I read something about it on stack exchange, but couldn't find that link anymore, but the one above has the same info
That has nothing to do with either g or pi. Also this definition is long outdated.
t = 2pi*sqrt(m/(mg/l)) is the pendulum formula, it directly calls pi and g. it's outdated, yes, but it's really close to what we currently use as a meter. and the fact that it's really close made it easier to switch to the new meter basis.
The meter is now defined based on the speed of light and a very short time interval.