REMARKS This result corresponds to an acceleration of over 6000 times the free-f

Question

REMARKS This result corresponds to an acceleration of over 6000 times the free-fall acceleration on Earth. Such a huge acceleration is far beyond what the human body can tolerate.

QUESTION Suppose the spacecraft managed to go into an elliptical orbit around Earth, with a nearest point (perigee) and farthest point (apogee). At which point is the kinetic energy of the spacecraft higher, and why? (Select all that apply.)

The apogee, because total energy is largest at the greater distance.

The perigee, because the gravitational potential energy has decreased and the kinetic energy therefore has increased.

The perigee, because the spacecraft must move faster at smaller radius to sweep out equal areas in equal times.

The apogee, because it is farthest from Earth with less force of gravity slowing the spacecraft.

Explanation / Answer

According to the given problem,

Ans:The perigee, because the gravitational potential energy has decreased and the kinetic energy therefore has increased.

Answer: When the satellite goes from apogee to perigee, it speeds up and gains kinetic energy. That means the gravitational field does positive work on the satellite by converting potential energy into kinetic energy.

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