Measurement of Newton's Constant Using a Torsion Balance with Angular Acceleration Feedback
Abstract
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 = \(6.674215+/0.000092\)×10^{11} m^{3} kg^{1} s^{2}; the Earth's mass is, therefore, M_{⊕} = \(5.972245+/0.000082\)×10^{24} kg and the Sun's mass is M_{solar} = \(1.988435+/0.000027\)×10^{30} kg.
 Publication:

Physical Review Letters
 Pub Date:
 October 2000
 DOI:
 10.1103/PhysRevLett.85.2869
 arXiv:
 arXiv:grqc/0006043
 Bibcode:
 2000PhRvL..85.2869G
 Keywords:

 General Relativity and Quantum Cosmology
 EPrint:
 4 pages, 4 figures