posted by Kendra .
In a popular amusement park ride, a cylinder of radius 2.19 meters is set in rotation at an angular speed of 5.09 rad/s. The floor then drops away, leaving the riders suspended against the wall in a vertical position. What minimum coefficient of friction between a rider's clothing and the wall of the cylinder is needed to keep the rider from slipping?
I am so lost on this problem. How do I solve this?