can you help?

A planet has a mass of 4.00 x 10-*kg and a radius of 6000.0 km. The gravitational constant is G = 6.673 x 10-11 N m2 kg 2. The planet does not have an atmosphere. a) What is the gravitational field strength at the surface of the planet? [2 Marks] b) What would be the weight of a 100.00 kg mass at the surface of the planet? [2 Mark] A satellite of mass 1000.0 kg orbits the planet at a height of 3.0000 x 10* km above the planet's surface. c) What is the period of the satellite's orbit in hours? [2 Marks]