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

Question

Quizplus · Accepted Answer

The correct answer is A because the mass of the planet is directly proportional to the square of the orbital speed and the cube of the orbital radius.

Spaceman Speff Orbits Planet X with His Spaceship