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Unformatted text preview: v 2 /r , where v is the speed of Earth, GMm/r 2 = mv 2 /r and v = r GM r = s (6 . 67 10 11 m 3 / s 2 kg)(3 . 27 10 25 kg) 1 . 50 10 11 m = 1 . 21 10 2 m / s . (b) The period of revolution is T = 2 r v = 2 (1 . 50 10 11 m) 1 . 21 10 2 m / s = 7 . 82 10 9 s = 248 y ....
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 Fall '08
 SPRUNGER
 Physics, Force, Mass

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