Asteroid Ida Was Photographed by the Galileo Spacecraft in 1993,and

Asteroid Ida was photographed by the Galileo spacecraft in 1993,and the photograph revealed that the asteroid has a small moon,which has been named Dactyl.From the dimensions of Ida and its general features,one can estimate the mass of Ida to be 4.5 × 10¹⁶ kg,and the distance between Dactyl and Ida is approximately 90 km.Assuming a circular orbit,what would be the orbital speed of Dactyl? (G = 6.67 × 10^-11 N ∙ m²/kg²)

A) 5.8 m/s
B) 11 m/s
C) 2.3 m/s
D) 2.9 m/s
E) 30 m/s

Correct Answer:

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