A 50-kg satellite circles the Earth in an orbit with a period of 120 min. What minimum energy is required to change the orbit to another circular orbit with a period of 180 min? (Earth: radius = 6.4 × 106 m, mass = 6.0 × 1024 kg)
A. 2.9 × 108 J
B. 3.5 × 108 J
C. 4.1 × 108 J
D. 4.7 × 108 J
E. 5.9 × 108 J
Answer: A
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