What is the energy requirement for traveling from Earth to the Moon?

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Homework Help Overview

The discussion revolves around the energy requirements for a spacecraft traveling from Earth to the Moon, specifically comparing the energy needed for this journey to that required for the return trip from the Moon to Earth.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the relationship between gravitational forces and energy requirements for the journey, with some attempting to determine whether the energy needed is greater, the same, or less when traveling from Earth to the Moon compared to the reverse trip.

Discussion Status

There is an ongoing exploration of the concepts involved, with participants offering differing viewpoints on the energy dynamics of the journey. Some guidance has been provided regarding the gravitational influences on energy requirements, but no consensus has been reached.

Contextual Notes

Participants are considering the implications of gravitational potential energy and how it affects the energy needed for each leg of the journey. The discussion reflects an examination of assumptions regarding gravitational forces on Earth and the Moon.

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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.
 
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Why?
 
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.
 
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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