Physics
posted by Nobody important .
I'm trying to figure out the answer to this question. It seems to easy, so I have my doubts.
Question:
Calculate the minimum change in velocity (delta V or ∆V) required for the Orion MPCV to decrease its altitude to 60 miles if it’s orbiting with an apogee of 260 miles and a perigee of 220 miles above the surface of Earth
Use the rule of thumb that below an altitude of 500 miles, for every 2 feet per second (fps) change in the orbiting space craft’s velocity its altitude will change by 1 mile
I have the answer of 320/fps. by subtracting apogee (260) and perigee(220)
getting 160. Then multiplying 2X160 get my answer of 320/fps
Im not asking anyone to do the problem for me but guidance or example of a similar problem. thank you

Physics 
bobpursley
160 milesalt decrease* 2fts/*milealt=your answer.

Physics 
Nobody important
I'm not sure I understand your example. can you elaborate?

Physics 
bobpursley
I repeated what you did...and you don't understand it?
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