WACE ATAR Physics Practice Questions - WACE Year 12 ATAR Physics (Units 3 & 4) Exam

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A satellite orbits Earth in a stable circular orbit. Which expression gives the orbital speed v of the satellite at distance r from Earth's centre of mass M?

v = sqrt(G * M * r) v = sqrt(G * M / r) v = G * M / r^2 v = 2 * pi * r / G

Correct Answer:

v = sqrt(G * M / r)

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