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a)You tell the boss (a) it is a dumb idea that will not work and (b) because the period will change by a factor of ?

i use the formula t = 2pie x sqrt(L/M)

then just change it to t = 2pie x sqrt(L/(1/2.56M))

but i have trouble finding the ratio?

b)By what factor must to the torsion constant be changed to make the smaller balance wheel oscillate at the same frequency?

*need formula please

2) A uniform circular disk whose radius R is 13.1 cm is suspended as a physical pendulum from a point on its rim. (The disk pivots about a loose-fitting nail driven through its face very close to the rim.) What is the period of oscillation?

*need formula please!

If you guys coudl just provide me with a clearers visual description and a dormula of what is happening I can do the math. Any help or suggestions are appreciated thank you!