I really dont understand the universal gravitation chapters and the satellites one. It is sooo confusing. So can anyone help me with these questions. 1. Determine the magnitude of the apparent of a 56 kg student standing in an elevator when the elevator is experiencing an acceleration of (a) 3.2 m's^2 [down] and (b) 3.2 m/s^2 [Up]. I dont even know how to start this question. I don't even know what exactly they are looking for. So can anyone please help. 2. The ISS travels at an altitude of 450 km above the surface of the Earth. (a) Determine the magnitude of the gravitational forces on a 64 kg astronaut at that altitude. (b) What percentage of the astronauts Earths-bound weight is in the force in (a)? I dont know how to start any of these questions. Can anyone please tell me step by step on how to do this please.