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A satellite of mass m and speed v moves in a stable, circular orbit around a planet of mass M.

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A satellite of mass m and speed v moves in a stable, circular orbit around a planet of mass M. What is the radius of the satellite's orbit?

(A) GM/mv

(B) Gv/mM

(C) GM/v2

(D) GmM/v

(E) GmM/v2

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Correct option (C) GM/v2

Orbital speed is found from setting GMm/r2 = mv2/r which gives v = √(GM/r)

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