Spaceman Speff Orbits Planet X with His Spaceship

question 57

Multiple Choice

Spaceman Speff orbits planet X with his spaceship.To remain in orbit at 421 km from the planet's center,he should maintain a speed of 80 m/s.What is the mass of planet X?

• A)4.0 × 10¹⁹ kg
• B)5.1 × 10¹⁷ kg
• C)4.0 × 10¹⁶ kg
• D)5.1 × 10¹⁴ kg

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