What is the force of gravity on a 90.0 kg astronaut in orbit about the earth at an altitude of
400.0 km? The radius of earth is approximately 6371 km.
Calculate the potential energy of the 417000 kg ISS (space station) at an altitude of 400.0
km.
What is the orbital period of a satellite 1000.0 km above earth’s surface, and the speed of the satellite?
What is escape velocity from the moon if the spacecraft must has a speed of 3000.0 m/s at
infinity?