Multiple Choice
Spaceman Speff orbits spherical asteroid X with his spaceship. To remain in a circular orbit at 421 km from the asteroid's center, he should maintain a speed of 
What is the mass of planet X? (G = 6.67 × 10-11 N ∙ m2/kg2)
A) 4.0 × 1019 kg
B) 5.1 × 1017 kg
C) 4.0 × 1016 kg
D) 5.1 × 1014 kg
Correct Answer:
Verified
Correct Answer:
Verified
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