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Question 30721
JEE Physics · Easy

Gravitation: Orbital Speed MCQ

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Orbital SpeedEasyQuestion 30721

Question

A satellite orbits Earth (mass M, radius R) at height h above surface. Its orbital speed is:
  1. A
    √(gR²/(R+h))
    Correct
  2. B
    √(2GM/(R+h))
  3. C
    √(GM/R)
  4. D
    √(g(R+h))

Correct answer

√(gR²/(R+h))

Explanation

v = √(GM/(R+h)) = √(gR²/(R+h)) since GM = gR².

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