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Going to guess civil. I work on space systems and we don't have one number. We have the g0 value, which is standard gravity out to some precision, but gravity matters enough we don't even use point mass gravity, we use one of the nonspherical earth gravity models. It matters because orbits.
Nope. Mechanical engineering. So usually we say g=10 and then make the steel a bit thicker and call it a day