Calculating Orbit Radius from Mass & Period

[Format]

How do you find an orbital radius of an object around Earth with its mass and Orbital Period?

 

[UrbanXrisis]

http://liftoff.msfc.nasa.gov/academy/rocket_sci/orbmech/formulas.html

http://www.glenbrook.k12.il.us/gbssci/phys/Class/circles/u6l4c.html

 

[Format]

Awsome, thanks man. Some of these equations I've never seen before help a lot lol

 

[UrbanXrisis]

Never doubt the power of Mr.Google!

 

[Format]

Kenetic/Potential Energy

When an object eaves the surface of the ground with a certain amount of Kenetic Energy and reaches a max height what does the Potential energy equal to?

I know the equation Ep = -Gmm/r but the question says it leaves the surface with 15 J of Kenetic energy.

 

[Parth Dave]

When it reaches a max height, what happens to the kinetic energy?

 

[Format]

It equals 0?

Does that mean potential energy is equal to it? or negative?

 

[UrbanXrisis]

The potential energy at its max height is equal to the amount of kenetic energy the object has just after it leaves the ground

 

[Format]

What about in orbit? How do you solve for Ep when you have Ek if you know the acceleration due to gravity and the mass?

 

[UrbanXrisis]

In orbit with constant velocity? or is it accelerating? In space, there is no acceleration due to gravity because there is no gravity.

 

[Format]

Its orbiting the earth, and is at a point where gravity is equal to .233 m/s²

 

[UrbanXrisis]

I believe the equation you're looking for is:
Gravitational Potential Energy U = mg ( yf - yi ) = mg y

However, I'm not quite sure what you're asking

 

[UrbanXrisis]

You might want to also check out this site:
http://www.artcompsci.org/vol_1/v1_web/node32.html

The beginning might have some equations that you're looking for.