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*Subject*: RE: [amsat-bb] Orbital velocity question*From*: "John Henderson" <jah@xxxxxxxxx>*Date*: Mon, 30 May 2005 20:34:57 -0400*In-reply-to*: <0IHA0066J713QH@a34-mta01.direcway.com>

Jamie, I finally derived the equation in the Journal and it is correct. Hope I can type this clearly.... The balancing force on a satellite at distance r is: (GMm)/r**2 = mw**2r G = gravity at surface, M = Earth mass m=sat mass r=distance from center of Earth w= angular velocity of sat The Orbital Velocity found from using the above and orb velocity : v = rw and g = GM/R**2 where g is gravity at sat and R is earth radius. Solving the forced equation for wr we get SqRT(GM/r) =wr Therefore v = SqRT (GM/R); solve g=GM/R**2 for GM we get g(R**2) Substitute in v= SqRT (GM/r) GM=g(R**2) and you get: V = SqRT (( gR**2)/r) 73, John N4NAB/ FM14lq AMSAT # 32411 ---- Sent via amsat-bb@amsat.org. Opinions expressed are those of the author. Not an AMSAT member? Join now to support the amateur satellite program! To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

**Follow-Ups**:**RE: Orbital velocity question***From:*James C. Hall, MD

**References**:**Orbital velocity question***From:*James C. Hall, MD

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