In another solar system, a planet has an airless moon Zygo that is 4.0 105 m in diameter. Experiments reveal that a freely falling object at the surface of Zygo accelerates at 0.20 m/s2. What is the mass of Zygo? (G = 6.67 10-11 N m2/kg2)
A) 2.4 1019 kg
B) 4.8 1019 kg
C) 1.2 1020 kg
D) 2.4 1020 kg
E) 4.8 1020 kg
Question 2
How many joules of energy are required to accelerate a 1.0-kg rock from rest to a speed of 0.866c? (c = 3.0 108 m/s)
A) 1.8 1017 J
B) 9.0 1016 J
C) 3.0 103 J
D) 3.3 1016 J