Re: Possibly "silly" questions

From: Bjoern Gimle (
Date: Sat Jun 16 2001 - 05:19:30 PDT

  • Next message: Jim McManus: "McManus Obs 16 June 2001"

    > No, an increase in speed, an acceleration, requires a thrust. If the
    > ends, the acceleration will drop to zero, i.e. the speed will be
    > (given that there are no other influences, such as gravity).
    Well, gravity is always there, weak or strong. So a LEO does have an
    acceleration of 9 m/s/s, but if it is in circular orbit, the speed doesn't
    change but the velocity vector rotates while maintaining its size. In
    elliptic orbits, speed decreases with altitude.
    In the GEO orbit, acceleration is 0.22 m/s/s.
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