Online calculation of torsional pendulum oscillation period

The calculation formula of the torsional pendulum oscillation period: $$ t = 2×pi×sqrt( l I_ 0 / k _t) $$

In the formula:

Pi = 3.14; t = period [s]; l = spring length [m]; I₀= moment of inertia [kgm²];k _{t</ Sub> = torsional stiffness [Nm²]}