1. The problem statement, all variables and given/known data In the Rotor Ride at the NM State Fair, passengers stand with their backs to the wall in a giant rotating drum with a radius of 10 feet. The drum is brought up to a speed of 33 1/3 RPM, and then the floor is lowered, leaving the passengers suspended above a giant hole in the floor, stuck to the wall by friction. The friction coefficient for the drum wall/clothing contact surface is typically s ' 0:3: Is this high enough to keep the passengers from sliding? How much can the angular speed be lowered before the passengers slide down into the hole? 2. Relevant equations arad=4∏2R/T2 3. The attempt at a solution I don't see how we are supposed include the friction coefficient if there isn't a place for it in the equation. Perhaps I am not using the correct formula?