# Homework Help: Putting an item into orbit. Help

1. Dec 3, 2008

### Squeek

1. The problem statement, all variables and given/known data
No idea how to do this honestly, but here it is. Hopefully someone can just work this out and I can learn from that. Calculate the velocity needed to place a 14.5kg item (its a turkey but whatever lol) into orbit around the Earth at an elevation of 100km. The radius of the Earth is 6500km. Like I said I'm not sure to how to do this and I need to know.

2. Relevant equations
I was given formulas ( These might have nothing to do with it, beware) Fc=mu2/r
ac=4pi2rf2

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Dec 3, 2008

3. Dec 3, 2008

### Squeek

The point is I don't know how to do it, I have no work. Obviously I'm not going to get any help so someone just delete this...

4. Dec 3, 2008

### LowlyPion

In general you know that there will need to be a conservation of energy to accomplish this don't you?

So doesn't the sum of the PE at surface + KE initial = PE at orbit + KE of object in orbit?