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Calculate the period of revolution (p) of Triton in its orbit around Neptune from Newton’s version of Kepler’s third law.

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p2 = (4π2/G(M + m))a3

p2 = (4 x 3.14 x (354.8 x 106)3)/(6.67 x 10-11 x 1.02 x 1026) = (4 x 9.8596 x 44.66 x 1024)/(6.8034 x 1015)

p2 = 258.88 x 109s

p = 508, 744,.8s = 508,744.8/(60 x 60 24)d

p = 5.88d

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