What is the critical speed of an artificial satellite orbiting close to the Earth?
Correct answer D. 7.9 km s⁻¹
Explanation
Critical orbital speed near the surface is v = √(gR) = √(9.8 × 6.4 × 10⁶) ≈ 7.9 km/s, the minimum speed needed to keep a satellite in a circular orbit.
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