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equation for time in pendulum:

t = 2 * pi * ( sq. root (l / g))

key:

t = time elapsed ( total, back and forth )

l = length , from pivot to centre of gravity

g = acceleration due to gravity

say 1 metre length pendulum on earth @ 9.82 (m/s)/s, t = 2.005 seconds

same pendulum on neptune @ 11.23 (m/s)/s, t = 1.875 seconds

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