A satellite circles a spherical planet of unknown mass in a circular orbit of radius 1.9×107 . The magnitude of the gravitational force exerted on the satellite by the planet is 120 .
What would be the magnitude of the gravitational force exerted on the satellite by the planet if the radius of the orbit were increased to 3.7×107 ?
If the satellite circles the planet once every 2.0 in the larger orbit, what is the mass of the planet?