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, 85 (14), 2869-72

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

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

J H Gundlach et al. Phys Rev Lett.

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) x 10(-11) m3 kg(-1) s(-2); the Earth's mass is, therefore, M = (5.972245+/-0.000082) x 10(24) kg and the Sun's mass is M = (1.988435+/-0.000027) x 10(30) kg.

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