The Weight of Spaceman Speff at the Surface of Planet

question 4

Multiple Choice

The weight of spaceman Speff at the surface of planet X, solely due to its gravitational pull, is 389 N. If he moves to a distance of 1.86 × 10⁴ km above the planet's surface, his weight changes to 24.31 N. What is the mass of planet X, if Speff's mass is 75.0 kg? (G = 6.67 × 10^-11 N ∙ m²/kg²)

• A) 2.99 × 10²⁴ kg
• B) 2.99 × 10¹⁸ kg
• C) 2.99 × 10¹⁷ kg
• D) 1.59 × 10¹⁸ kg

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