p45_038 - r GM r = r GM r r R 3 = r r GM R 3 . (b) In the...

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38. (a) The mass of the portion of the galaxy within the radius r from its center is given by M 0 =( r/R ) 3 M . Thus, from GM 0 m/r 2 = mv 2 /r (where m is the mass of the star) we get v =
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Unformatted text preview: r GM r = r GM r r R 3 = r r GM R 3 . (b) In the case where M = M , we have T = 2 r v = 2 r r r GM = 2 r 3 / 2 GM ....
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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