Per NCERT Example 7.8, 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)
NCERT Ex 7.8: ΔE = E_f − E_i = −GMm/(8R) − (−GMm/(4R)) = +GMm/(8R). Positive ⇒ energy must be added.
Related questions
Tycho Brahe recorded his observations using:Kepler's three laws describe the motion of:The low escape speed of the moon explains why it has no:The moon's escape speed compared with the earth's is smaller by about:The escape speed for the moon works out to about:The law of periods uses which measurement of the ellipse?By the law of periods, the square of the period is proportional to:The law of areas explains why a planet moves slower when it is: