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**1. The problem statement, all variables and given/known data**

A remote-sensing satellite travels in a circular orbit at a constant speed of 8.2 x 10^3 m/s. Determing the altitude in kilometres of the satellite above Earth's surface.

**2. Relevant equations**

Fc = FG

**3. The attempt at a solution**

mv^2/r = GMm/r^2

v^2 = GM/r

r = GM/v^2

r = (6.67 x 10^-11 * 5.98 x 10^24)/(8.2 x 10^3)^2

r = 5931975 m - radius of Earth (6.38 x 10^6 m)

r = NEGATIVE NUMBER

Why am I getting a negative number? Is there a mistake in my conversions or am I completely off as to how to solve this? Any help will be greatly appreciated. :)