The mass of a new discovered planet is 6.39 × 10^23kg. If the weight of a spaceship from earth that landed on this new discovered planet weighs 3000 N on this planet and weighs 7,930.477 N on earth, what is the radius of this planet (the center of gravity of the spaceship is not to be considered). a. R = 4.6532 km b. R = 6.5634 km c. R = 3.3897 km d. R = 8.5443 km

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