Orbital motion Quiz
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5 questions, one answer each
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1. A satellite orbits at radius r with speed v. A second satellite of twice the mass orbits at the same radius. What is its speed?
- A. v/2
- B. √2 v
- C. 2v
- D. v
2. A satellite is moved to an orbit of four times the radius. What happens to its orbital speed?
- A. It halves
- B. It quarters
- C. It doubles
- D. It is unchanged
3. Which equation gives the orbital period T of a satellite in a circular orbit of radius r around mass M?
- A. T² = GM r³/4π²
- B. T² = 4π²r³/GM
- C. T = 4π²r/GM
- D. T² = 4π²r²/GM
4. Which condition is NOT required for a geostationary orbit?
- A. Period of 24 hours
- B. Orbit above the equator
- C. Orbital height of about 600 km
- D. Same direction of travel as the Earth's rotation
5. Planet X has a moon orbiting at radius r with period T. A second moon orbits at radius 2r. What is its period?
- A. 2T
- B. 4T
- C. 8T
- D. √8 T