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So far, I'm changing the mass of the pendulum, the length of wire, type of wire and thickness of wire, can anyone recommend anything else?

Also, I'm looking at the formula T=2∏√(I/k) where I is the moment of inertia and k is the torsional constant of the wire, but have absolutely no idea where to find the torsional constant of the wire, any ideas?

Thankyou so much! :)