When a satellite is launched, its orbital radius is usually determined far in advance because the amount of energy required to change its orbit is large. How much work, W , would a rocket thruster on a satellite of mass m = 760 kg need to do to change the satellite's orbital radius from r1 = 2.71\times 107 m to r2 = 4.40\times 107 m ? The Earth's radius is RE = 6.37\times 106 m . Assume that both orbits are circular.