1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

I need data from the Cavendish Experiment

  1. May 23, 2012 #1
    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
     
  2. jcsd
  3. May 27, 2012 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    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.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: I need data from the Cavendish Experiment
Loading...