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## Homework Statement

How much energy is required to move this satellite to a circular orbit with a radius of 2.50×104 miles?

I've found the answer to Part A of this problem to be 1.59*10^10, if this helps solve the above^^

(Find the kinetic energy of a 1.80×103 kg satellite in a circular orbit about the Earth, given that the radius of the orbit is 1.40×104 miles.)

## Homework Equations

v^2=G Me / r

KE = 1/2mv^2

.5*m*v^2=.5*m*(G*mEarth/R)

E = 1/2mv^2 - GMm/r

KE = 1/2mv^2 = 1/2 GMm/r

E = -1/2 GMm/r

dE = E2 - E1 = GMm*(-1/r2 +1/r) = GMm*(r2 -r)/(r*r2)

## The Attempt at a Solution

using these formulas have given me three wrong attempts on my homework and i don't know what I'm doing wrong. any help would be very appreciative.