The mass in a pendulum clock completes one complete swing in 1.25 s .

The mass in a pendulum clock completes one complete swing in
2.50s . What is the length of the rod? Show work and answer for points.

t = 2pi * sqrt (l/g)
l = gt^2 / 4pi^2
= 9.8*(2.50)^2 / 4pi^2
= 1.55 m

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