An engineer has an odd-shaped object of mass 16 kg and needs to find its rotational inertia about an axis through its center of mass. The object is supported on a wire along the desired axis. The wire has a torsion constant κ = 0.4 N· m. If this torsion pendulum oscillates through 40 complete cycles in 50 s, what is the rotational inertia of this object?
I assume you use frequency somehow but, not sure how t change it into inertia
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