A simple pendulum oscillates with a period of $3\mathrm{.}19$s$.$ What is the length of this pendulum in units of meters?

Suppose you have a long, thin rod of length $2\mathrm{.}79$m that is free to rotate about a fixed end. If the rod's composition is uniform $($which means it has the same mass density all along its length$),$ and if the mass of the rod is $0\mathrm{.}05$kg$,$ what is the rod's moment of inertia $($or rotational inertia$)$ in units of kg$*$m$2?$

During a relaxed walking pace, a person's leg can be thought of as a physical pendulum of length L that pivots about the hip. What is the relaxed walking frequency in Hz for a person whose leg is of length $1\mathrm{.}371$m$.$ In this approximation, assume the leg is a uniform rod $("$uniform$"$ implying the leg has a uniform mass density along its length$).$

What is the period of oscillation $($in seconds$)$ of a rod of length $4\mathrm{.}66$m that is fixed at one end, but otherwise free to rotate without any friction, which has a mass $4\mathrm{.}16$kg$,$ for small displacements?