Hard Physics Problem - Centripetal Force

[Rbethell16]

Homework Statement

A popular amusement ride operates as follows: Riders enter the cylindrical structure when its stationary with the floor. They then stand against the wall as the cylinder then begins to rotate. When it is up to speed, the floor is lowered, leaving the riders suspended against the wall high above the floor. What is the maximum period of rotation necessary to keep the riders from sliding down the wall when the floor is lowered.

Homework Equations

Fc = Vr^2/m

The Attempt at a Solution

I truly do not know where to begin

 

[rock.freak667]

The Attempt at a Solution

I truly do not know where to begin

Start by drawing a free-body diagram, remember that centripetal force should not be on your diagram.

 

[gneill]

I truly do not know where to begin

Perhaps with the specification of the coefficient of friction for the wall?