I need data from the Cavendish Experiment

[therohboat]

Hi guys

I am doing a presentation on the cavendish experiment. But to show how it is done, I not only need to conceptually explain how it was done I need numbers so I can run it through equations so I can show the end result.

I have scoured the internet for data table without any success. Is there anywhere where I can find some data for Cavendish's experiment?

Also, in Cavendish's experiment, is it correct in deriving the equation for G by saying:

Torque = Torsion constant x Theta
Torque = Force x Radius

Therefore, torsion constant x theta = force x radius.

Then, force = (torsion constant x theta) / radius

Then, force = Newton's Law of Gravitation

Therefore, (torsion constant x theta) / radius = Newton's Law of Gravitation

Then, torsion constant = (Newton's Law of Gravitation x radius) / (distance between two objects ^2) x Theta

The next big chunk is

Period = (2 x pi) x (( Moment of Intertia / Torsion Constant) ^-1)

And moment of inertia is 2m(L/2)^2

So Period = (2 x pi) x (( 2m(L/2)^2 / (Newton's Law of Gravitation x radius) / (distance between two objects ^2) x Theta

If you're still reading, and I haven't lost you I got

Gravitational Constant = ((4 x pi^2) x 2m(l/2)^2) / ((Period ^2) x radius (M x m / distance between two objects^2) x theta)

For F*ck's sake, my goodness

Well please help me out. I will be eternly grateful

 

[Simon Bridge]

I need numbers so I can run it through equations so I can show the end result.

Since it is only a presentation you can run the whole thing backwards (work out what the data would look like knowing G and how it's done - randomize it slightly to simulate measurement uncertainties.)

The physics is basically for a damped mass on a spring.