Measurement of Newton's constant using a torsion balance with angular acceleration feedback.

  title={Measurement of Newton's constant using a torsion balance with angular acceleration feedback.},
  author={Jens H Gundlach and S. M. Merkowitz},
  journal={Physical review letters},
  volume={85 14},
We measured Newton's gravitational constant G using a new torsion balance method. Our technique greatly reduces several sources of uncertainty compared to previous measurements: (1) It is insensitive to anelastic torsion fiber properties; (2) a flat plate pendulum minimizes the sensitivity due to the pendulum density distribution; (3) continuous attractor rotation reduces background noise. We obtain G = (6.674215+/-0.000092) x 10(-11) m3 kg(-1) s(-2); the Earth's mass is, therefore, M = (5… 

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