You have a spaceship which is a thin spherical shell. Its mass is around 12000 kg and consists of a radius of 40m. You have one rocket which is situated on the surface of the shell. If fired, the shell will rotate. Determine the force provided by the rocket such that a person standing on the within of the shell will undergo normal gravity at 30 minutes? Determine the angular acceleration? Determine how many times did the shell rotate throughout this time?