I need help with questions B and C.

A person of mass m = 75 kg is at the highest point above the ground on a rotating Ferris wheel.

The normal force acting on the person at that point is nT = 615 N.

a) What is the value of the centripetal acceleration a? 1.6 m/s^2

b) What is the normal force acting on the person when she is at the lowest point on the rotating Ferris wheel?

c) If the Ferris wheel doubles its angular velocity, what is the normal force acting on the person when she is at the highest point on the Ferris wheel?