alleryA satellite is in circular orbit at radius 2R from Earth's centre. Its orbital velocity in terms of v_surface = √(gR):
Av_surface/√2
Bv_surface × √2
Cv_surface
Dv_surface/2
Answer & Solution
Correct answer: A. v_surface/√2
Orbital velocity v_orb = √(GM/r).
At r = 2R: v_orb = √(GM/(2R)) = (1/√2) √(GM/R) = v_surface / √2.
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