Weightlessness of astronauts in orbit · CAP 2006 #13
Physics · mechanics
Problem
Astronauts are weightless in orbit because:
(a) they are beyond the pull of gravity;
(b) they travel in the accelerated frame of reference where fictitious centrifugal force is equal to centripetal force, and the net force on an astronaut is zero;
(c) they are in free fall together with their spacecraft;
(d) of another cause.