At an amusement park there is a ride in which cylindrically shaped chambers spin around a central axis. People sit in seats facing the axis, their backs against the outer wall. At one instant the outer wall moves at a speed of 3.8 m/s, and an 83 kg person feels a 540 N force pressing against his back. What is the radius of the chamber?

i know that an equation must be used, but there seems to be missing variables i believe.

...nevermind i got it!

i just used Fc = (m * v^2) / r

works very well to find the radius after you get the radius by itself in the equation.