Posted by **Brenda** on Saturday, September 29, 2012 at 2:00am.

A spy satellite is in circular orbit around Earth. It makes one revolution in 6.01 hours.

(a) How high above Earth's surface is the satellite?

[Answer in Km]

(b) What is the satellite's acceleration?

[Answer in m/s^2]

I see this posted over and over again and I have about 4 equations, 20 different answers, and none are correct.

NOTE: There is no radius or velocity available to enter into the equations. I have used T=2 pi sqrt(r^3/G) and the r is bigger than earths radius so I can't subtract! are my units jacked up or what! I have spent hours on this and I can't stand it anymore!!!!

- Physics -
**bobpursley**, Saturday, September 29, 2012 at 10:35am
Your basic equations are

Newtons gravity equation, and centripetal force. Set them equal.

Then remember velocity=2PI r/Period

keep units in SI.

Remember the trick in a: when you find r, subtract the radius of earth.

Why are you grazing for answers? I will check your work if you do the above, and post it. R has to be bigger than earth, of course, it is outside Earth.

- Physics -
**Brenda**, Saturday, September 29, 2012 at 1:41pm
I am grazing for answers because I spent 5 hours or more manipulating basically 1 equation and plugging in numbers to no avail. I was using my e^x function as 10^x. 8-/

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