The hang time is twice the free fall time for the height, because the person has to go up first, and then falls back down. Thus twice this is 1s for a hang time. The horizontal speed or distance doesn't affect the hang time so the answer is the same for the second part. In one rotation, the passenger travels one circumference. Chapter 4 Review Questions 4.
Force is a vector because it has magnitude and direction.
The direction of the force does matter. If the mass is unchanged, the acceleration is proportional to the force. If the force is tripled, the acceleration is also tripled. This time the mass is tripled and the force is kept constant. If the mass and the net force are both tripled, the acceleration will be unchanged.