A uniform meter stick is hung at its center from a thin wire. It is twisted and oscillates with a period of 5 s. The meter stick is then sawed off to a length of 0.76 m, rebalanced at its center, and set into oscillation.(adsbygoogle = window.adsbygoogle || []).push({});

******************

With what period does it now oscillate?

Ok, I know that the period for a torsion pendulum T=2pi*sqrt(I/k)

Where I is moment of inertia

and K is the torsion constant

Two things I am stuck on.

To calculate the moment of inertia => 1/12 ML^2

I need to konw the mass of the rod...unless this mass drops out of the calculations, I don't know what to do

Also, the torsion constant. I do not konw what that is either, unless that too also drops out of my calculations. A little guiadance here greatly appreciated.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Torsion Pendulum

**Physics Forums | Science Articles, Homework Help, Discussion**