4. (a)What is the speed, period, and radial acceleration of a communications satellite in a circular orbit 5000 km above the surface of the earth. The earth's radius is 6380 km and its mass is 5.98 x 1024 kg. G=6.67 x 10ll Nm/kg (b) At what height above the surface of the earth should the satellite be placed for the orbital speed to be 3000 m/s?

4. (a)What is the speed, period, and radial acceleration of a communications satellite in a circular orbit 5000 km above the surface of the earth. The earth's radius is 6380 km and its mass is 5.98 x 1024 kg. G=6.67 x 10ll Nm/kg (b) At what height above the surface of the earth should the satellite be placed for the orbital speed to be 3000 m/s?