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The mean radius of the earth is R, its angular speed on its own axis is ω  and the acceleration due to gravity at earth’s surface is g. The cube of the radius of the orbit of a geostationary satellite will be  

(a)     R2g/ ω                                     (b) R2 ω2/g

(c)  Rg/ ω2                                      (d) R2g/ ω2

Answer: d

(3)

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