# Gravitational Potential Energy (Multiple Choice Question)

by McAfee
Tags: choice, energy, gravitational, multiple, potential
 P: 81 1. The problem statement, all variables and given/known data Question: Rank the paths according to the corresponding change in the gravitational potential energy of the rocket–moon system, greatest first. A. 1 > 3 > 5 > 2 = 4 = 6 B. 2 = 4 = 6 > 5 > 3 > 1 C. 1 = 2 = 3 = 4 = 5 = 6 D. 1 > 2 = 4 = 6 > 3 > 5 3. The attempt at a solution I'm not understanding the question. I guess it would be A, but I'm not sure why.
 PF Patron HW Helper P: 3,394 Probably "1>3" means orbit 1's energy is greater than orbit 3's energy.
P: 81
 Quote by Delphi51 Probably "1>3" means orbit 1's energy is greater than orbit 3's energy.
Sorry I forgot to include the question.

PF Patron
HW Helper
P: 3,394

## Gravitational Potential Energy (Multiple Choice Question)

That "changes" things! It must mean the change going from a to b. Potential energy only. Much easier. You will want to have your formula for grav potential energy handy.
P: 81
 Quote by Delphi51 That "changes" things! It must mean the change going from a to b. Potential energy only. Much easier. You will want to have your formula for grav potential energy handy.
The formula is Grav potential energy= -GMm / r

I think the answer would be either A or B.
 PF Patron HW Helper P: 3,394 It seems clear to me you are misunderstanding something, but I'm not supposed to just tell you the answer. Can you explain your reasoning leading to A or B? They are rather different! A says path 1 has the highest change in PE while B says path 1 has the lowest change in PE. Both say 2, 4 and 6 have the same energy - why do you think that is true?

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