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Does Newton’s version of Kepler’s third law apply to comets? Make a calculation for the comet Encke and find out.

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p2 = (4π2/G(M + m))a3

All variables must be expressed in SI units because that is required if G = 6.67 x 10-11N m2/kg2

The period of revolution of comet Encke is 3.30 y. Evidently, Newton’s form of Kepler’s third law does apply to objects that revolve around the Sun including comets.

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