Measurement of Newton's Constant Using a Torsion Balance with Angular Acceleration Feedback

Details Measurement of Newton's Constant Using a Torsion Balance with Angular Acceleration Feedback Measurement of Newton's Constant Using a Torsion Balance with Angular Acceleration Feedback

2000-06-13

arxiv.org/abs/gr-qc/0006043v2

Phys.Rev.Lett. 85 (2000) 2869-2872

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.85.2869

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)x10^-11 m^3kg^-1s^-2; the Earth's mass is, therefore, M = (5.972245 +- 0.000082)x10^24 kg and the Sun's mass is M = (1.988435 +- 0.000027)x10^30kg.

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