Finding the length of a pendulum

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Bugsy23
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Is there more than one way to find the length of a pendulum undergoing lightly damped harmonic motion? The equation I have is

l=(T/2pi)^2*g

Is there an alternative equation for calculating length, which also takes into account the oscillator's mass?
 

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The oscillator's mass is not actually relevant for a situation in which damping is negligible. If damping is non-negligible, then you would also need to know details about the damping to determine the length.
 

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