# What is the minimum amount of work needed to move the satellite from this orbit to a

In certain cases, using both the momentum principle and energy principle to analyze a system is useful, as they each can reveal different information. You will use the both momentum principle and the energy principle in this problem.

A satellite of mass 4000 kg orbits the Earth in a circular orbit of radius of 9.5x10^6 m (this is above the Earth's atmosphere).The mass of the Earth is 6.0x10^24 kg.

a)What is the magnitude of the gravitational force on the satellite due to the earth?
F= 17817.17452 N

b)Using the momentum principle, find the speed of the satellite in orbit.
v=6505.058761

c)Using the energy principle, find the minimum amount of work needed to move the satellite from this orbit to a location very far away from the Earth. (You can think of this energy as being supplied by work due to something outside of the system of the Earth and the satellite.)

i cant get C i tried GMm1/r and got 1.69e11 J and its wrong can someone help me out here?

## Answers and Replies

nevermind i figured it out i forgot to subtract KE