Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Gravitational Constant

  1. Dec 20, 2006 #1
    1. The problem statement, all variables and given/known data
    I'm writing a report about the gravitational constant G.
    I have trouble figuering out what all the variables mean means.
    G = w^2 * r^2 * d(Φ1 - Φ2) / 2M(1 + d/r(Φ1 - Φ2))

    The experiment was executed in Cavendish torsion balance.
    Two wires which held 2 large orbs, and 2 small orbs, had an laser with a lens attached. Since all masses attract, oscillation the oscillation was shown on a screen.
    Then you could measure the movement and the change in angles.

    2. Relevant equations
    G = w^2 * r^2 * d(Φ1 - Φ2) / 2M(1 + d/r(Φ1 - Φ2))

    Angle = arctan(W all)/D))/2
    Divide by two because of the lens.

    Y1=Φ1 + A *sin(wt +d1)
    Y2=Φ2 + A *sin(wt+d2)

    3. The attempt at a solution
    I believe W is the frequency, d is the distance of the short wire with the two small orbs, M is the mass of both? orbs, Φ1 & Φ2 are the angles and r is the radius.

    If you guys could verify this and please correct me if I'm wrong.
    If anything is unclear please say so, since I'm not too good at english.
    Thank you!
    Last edited: Dec 20, 2006
  2. jcsd
  3. Dec 20, 2006 #2
    I note that the "w" is probably "omega" (an ANGULAR frequency).
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook