5. An astronaut with a mass of 74 kg goes up to the ISS on a mission. During his stay, the gravitational field strength on
the station is 8.6 N/kg.
(a) What is the mass of the astronaut on the station?
(b) What is the difference between the astronaut's weight
on Earth's surface and his weight on the station?
(C) Why does the weight of the astronaut change but not his
mass when moving from the surface of Earth to the station?
(d) Why does the astronaut appear weightless on the station?