From the film “The Martian:”

If we take the woman in the picture to be 5 feet tall, then we can assume the radius of the wheel on whose edge she is standing to be 50 feet. Give or take.

Here’s the question: If a human is standing on the inside of a rotating cylinder 100 feed in diamater (radius = 50 ft), now many RPMs would that cylinder have to be turning on its axis in order to approximate 1 gravity at the outside of the cylinder?