A) if there is no relative motion between the train and the edge of the platform, how fast must the train move compared to the rim speed of the rotating platforms? B) why is the stairway located at the center of the platform?

Which of the following characteristics of earth's relationship to the sun explains the existence of earth's seasons? choose all that apply. earth has a satellite called the moon, which rotates around earth. earth spins on its axis, completing one rotation each day. earth's axis always points in the same direction relative to the stars. earth's axis is tilted relative to its orbital plane. earth orbits around the sun, completing one orbit each year.