Earth to the Moon power help

  • Thread starter msattar07
  • Start date
  • #1
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Homework Statement


The amount of energy required to get a spacecraft from the Earth to the Moon

a. is greater than the energy required to go from the Moon to Earth.
b. is the same as the energy required to go from the Moon to Earth.
c. is less than the energy required to go from the Moon to Earth.


Homework Equations



G= mM/r^2

The Attempt at a Solution


I think the answer is c.
 

Answers and Replies

  • #2
Dick
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Why?
 
  • #3
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wait, i get it now.

gravitational force is greater on earth so it would require MORe energy to go from earth to moon..
answer is A.
 
  • #4
Dick
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Yes. Though you are oversimplifying a bit. In going from the earth to the moon means you are losing energy to the potential energy of the earth's gravitational field and gaining it from the moon's. Coming back is the reverse. Which potential energy difference is greater?
 

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