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Rotational increase of planetary body: less or more gravity: centrif. vs. Mass incr?

  1. Jan 11, 2009 #1
    Science news recently reported milky way rotates faster than thought - hence more mass. How does this work out for a single planetary body: If rotation is accelerated, my thought was: less gravity, bec. higher centrifugal force. Now, I'm thinking - more mass due to rotation hence more gravity. For discussion, let us assume an earth-size body made of identical solid material which cannot "fly-off", no geostrata with different properties.

    On a sidenote, if the rotation->mass increase is correct, we should be able to decrease gravity here on earth below an elevated, smooth, large globe, as we let it spin fast. Has this been tried ?
    Thx for comments !
  2. jcsd
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