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As per your syllabus, energy required to move a satellite from a circular orbit at 2R_E to 4R_E around Earth is which?
A+G M m / (8 R_E)
B+G M m / (2 R_E)
C−G M m / (8 R_E)
D−G M m / (2 R_E)
Answer & Solution
Correct answer: A. +G M m / (8 R_E)
syllabus Ex 7.8: ΔE = E_f − E_i = −GMm/(8R) − (−GMm/(4R)) = +GMm/(8R).
Positive ⇒ energy must be added.
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