Satellite A orbits Earth at radius 4R with speed 3v. Satellite B orbits at radius R. What is the speed of satellite B?
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Satellite A orbits Earth at radius 4R with speed 3v. Satellite B orbits at radius R. What is the speed of satellite B?

G1 Physics · Accepted Answer

Step 1: For a circular orbit, speed v=√(GM/r)∝1/√r. Step 2: vᵦ/vₐ=√(rₐ/rᵦ)=√4=2, hence vᵦ=2×3v=6v. Final answer: B — 6v.