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**1. Homework Statement**

Question 1: What speed must a satellite have to orbit the earth at a distance 7.8 x 10^7 m/s from the earth's centre, where the acceleration due to gravity is 0.065 m/s^2?

Question 2: An object orbits the earth at a constant speed in a circle of radius 6.38 x 10^6 m, very close to but not touching the earth's surface. What is its centripetal acceleration?

**2. Homework Equations**

Ac = v^2 / r

Fc = mv^2 / r

V = 2(pie)r / T

**3. The Attempt at a Solution**

For the first question I assumed that the centripetal acceleration was the force of gravity and so I got:

Ac = v^2 / r

0.065 = v^2 / 7.8 x 10^7

V = 2252 m/s

I don't even know if that is right.

And then the next question is really touch and making me confused. There are too many satellite questions in my homework assignment and its frustrating me. What do I do! :/