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Unformatted text preview: INDIANA UNIVERSITY, DEPARTMENT OF PHYSICS, P309 LABORATORY Laboratory #15: Constant of Gravitation Goal: Measure the force constant G of gravitational attraction Equipment: Leybold torsion balance with masses (DC531.51), laser on adjustable stand, projection screen (experiment set up on concrete pedestal in subbasement (SW S15)).The physics (A) Physics: With his law of gravitation Newton stated in 1686 that two bodies attract each other with a force that is proportional to the product of their masses and the inverse square of the distance. The constant of proportionality, G , is one of the fundamental constants of nature. G plays a role, for instance, in astronomy, cosmology, and general relativity. Among the known forces of nature, gravity is the weakest, thus the determination of G involves a measurement of very small forces. More than a century after Newton, in 1798, G was measured for the first time in a clever experiment carried out by Henry Cavendish [CAV98]. Look up this reference, it is a beautiful example of a clear report on a careful [CAV98]....
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This note was uploaded on 01/20/2012 for the course P 309 taught by Professor Urheim during the Spring '11 term at Indiana.
- Spring '11