Finding the length of a pendulum

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The discussion centers on calculating the length of a pendulum undergoing lightly damped harmonic motion. The primary equation provided is l=(T/2pi)^2*g, which does not factor in the mass of the oscillator, as it is irrelevant in cases of negligible damping. When damping is significant, additional information about the damping characteristics is necessary to accurately determine the pendulum's length. Participants emphasize that the mass does not influence the length calculation in lightly damped scenarios. Overall, the focus remains on the relationship between damping and the pendulum's length measurement.
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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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