# 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

1. bobpursley

2. Nobody important

I'm not sure I understand your example. can you elaborate?

3. bobpursley

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

## Similar Questions

1. ### Physics

this question came up in my work, and i don't remember reading about it in my book. can you tell me what it is asking for, and how to do it.. if the change in position delta x is related to velocity v(with units of m/s) in the equation …
2. ### Physics

1. If the change in position delta(x) is related to velocity v (w/ units of m/s) in the equation delta(x)=Av, the constant A has which dimension?

Calculate the minimum change in velocity (delta V or ∆V) required for the Space Shuttle to decrease its altitude to 60 miles if it’s orbiting with an apogee of 236 miles and a perigee of 215 miles above the surface of Earth. …
4. ### Physics

The De-orbit Burn The Shuttle must reduce its velocity at a pre-calculated point in its orbit in order to return to Earth. In order to reduce the velocity and change the orbit of the Shuttle, a maneuver called the de-orbit burn is …
5. ### Physics - Kinematics

Need some help with my homework! Question 7 a) Acceleration is the rate of change of velocity Use your definition in (a) to show that v = u + at, where v is the final velocity, u is the initial velocity and a and t are the acceleration …
6. ### biochem

I'm stuck on this question, not sure where to start. can you show detail and explain so that it helps me to understand it. help please, thanks. The value of delta G for the conversion of 3-phosphoglycerate to 2-phosphoglycerate (2PG) …
7. ### CHEMISTRY

I know I posted this question before, but can you clarify it?
8. ### Chemistry

I know I posted this question before, but can you clarify it?
9. ### Rocket Science

Calculate the minimum change in velocity (delta V or ∆V) required for the Space Shuttle to decrease its altitude to 60 miles if it’s orbiting with an apogee of 246 miles and a perigee of 212 miles above the surface of Earth
10. ### Math/Science

Calculate the minimum change in velocity (delta V or ∆V) required for the Space Shuttle 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.

More Similar Questions