7. There is a new satellite being launched to orbit the Earth. If the satellite travels in circular motion around the planet, what velocity must it have to stay in an orbit of radius 400 km. Use the gravitational force law below as the force that keeps it in circular motion where m is the mass of the satellite, 10000 kg, M is the mass of the Earth, 5.972 x 10^24 kg, Gis the Gravitational constant, 6.67 x 10^-11 N*m^2*kg^-2, and r is the radius of orbit.