How to Calculate Normal Force in a Rotating Environment?

[rtllz]

Homework Statement

Q: At a circumferential speed of 3m/s, what is the normal force exerted by the walls on a person having a mass of 70kg?

givens:
diameter of room is 3.1m
coefficient of friction between the people and the wall is .4

Homework Equations

circumferential speed=2(pi)r/t...t is the amount of time it takes to complete one revolution
Friction force = (coefficient of friction) × (normal force)

The Attempt at a Solution

 

[srmeier]

You must attempt to make a solution before receiving assistance.