- #1

lizzyb

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## Homework Statement

Calculate the work required to move a planet's satellite of mass 2230 kg from a circular orbit of radius 2R to one of radius 3R, where 5.32 X 10^6 m is the radius of the planet. The mass of the planet is 3.36 X 10^24 kg.

Answer in units of J.

## Homework Equations

[tex]U(r) = -\frac{G M m}{r}[/tex]

## The Attempt at a Solution

[tex]W = \Delta U = U_f - Ui = - \frac{G M_p M_s}{3 R} + \frac{G M_p M_s}{2 R} = - \frac{2 G M_p M_s}{6 R} + \frac{3 G M_p M_s}{6 R} = \frac{G M_p M_s}{6 R}[/tex]

the answer I got (1.5663 X 10^10) was wrong.

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