1. The problem statement, all variables and given/known data Prove the equation: T = 2 pi * sqrt(L/g), then determine the period of a "seconds pendulum" (period = 2 sec on Earth) on the surface of the moon. 2. Relevant equations T = 2pi * r/v T = 2pi/ω ar = rω2 3. The attempt at a solution Do you assume ar is ag? T = 2pi/ω = 2 * pi / sqrt(a/r) = 2 * pi * sqrt(r/a) ...Apparently, L is supposed to be the length of the pendulum, so somewhere along the line, I completely screwed up. I can solve the second part of the question just fine, but since I've never actually seen T = 2 pi * sqrt(L/g) used or proved, I'd rather not work with it until I understand where it comes from and how it works.