The Cajun Cliffhanger used to be a ride at Great America where you would stand with your back to the inside wall of a vertical cylinder. As the cylinder turned faster and faster, eventually the floor beneath you would be lowered leaving you 'plastered' to the wall. The ride had a radius of 2.5 m and a period of revolution of 2.0 seconds. Determine the minimum coefficient of friction needed to keep passengers from sliding down the wall when the floor is dropped away.